Dental cleaning device and manufacturing process of the same

Abstract

Dental cleaning device (1000) comprising a handle (2) configured for being grabbed by a user, a mouthpiece (100) connected or connectable to said handle (2) and configured for being inserted into the user's mouth, wherein the mouthpiece (100) defines an arcuate profile, sets of brush heads (200) positioned on the mouthpiece (100) and configured for cleaning, during a use condition of said dental cleaning device, the user's teeth, and a motorr operatively connected to said sets of brush heads (200) and configured to cause an alternating motion of said sets of brush heads (200). The dental cleaning device further includes a transmission system connecting kinematically the motor to the sets of brush heads (200), wherein the transmission system includes at least one motion-transfer rod (500) operatively connected to the motor and extending along the arcuate profile of the mouthpiece (100), the sets of brush heads (200) being fixed to the at least one motion-transfer rod (500).

Description

[0001] Title: Dental cleaning device and manufacturing process of the same

[0002] DESCRIPTION

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to a dental cleaning device for oral care including a mouthpiece carrying a plurality of brush heads.

[0005] BACKGROUND

[0006] Traditional electric toothbrushes are well-known products widely diffused all over the world. They are recommended by dentists and hygienists’ community to help patients keeping their oral hygiene good and preventing the most common oral diseases. It is indeed agreed that such tools, if used correctly, are more than sufficient to ensure good oral hygiene.

[0007] However, their use is still based on the technique of the user, who needs to move it around the mouth to reach all teeth. Especially for patients with gingival and periodontal problems, incorrect or careless use results in worsening of the disease and the need for surgical interventions. For this reason, solutions that aim to limit the user’s intervention and automate the cleaning have already been introduced. These solutions can be encompassed in the world of mouthpiece toothbrushes.

[0008] Mouthpiece toothbrushes have an arch-shaped head with bristles that can potentially cover all surfaces of all teeth simultaneously: the existing solutions are primarily electric toothbrushes. These solutions limit the actions of the user, as they do not need to move the toothbrush inside the mouth: instead, the movement of the toothbrush cleans all the teeth simultaneously, also reducing the overall usage time. However, these solutions also present disadvantages, primarily less comfort and adaptability to different mouths.

[0009] As a first point, the Applicant points out that the devices of the state of the art may not provide oral cleaning in an effective and efficient manner for both incisor and molar teeth. Furthermore, the embodiments of the devices of the state of the art result in shapes and dimensions that may be uncomfortable for the user subject.

[0010] Furthermore, the shapes and sizes of mouths and teeth vary, making it difficult to guarantee good cleaning quality and comfort with mouthpieces of fixed and limited sizes.

[0011] Documents US2017100223A1 , WO2006114291A2 and US2015282911A1 disclose archshaped electric toothbrushes. SCOPE OF THE INVENTION

[0012] The scope of this invention is therefore to at least partially solve one or more of the drawbacks and / or limitations of the previous mouthpiece solutions.

[0013] A first objective is to provide a dental cleaning device able to improve oral hygiene of the subject.

[0014] A further objective is to provide a dental cleaning device able to improve its effectiveness during dental cleaning.

[0015] A further objective is to provide a dental cleaning device able to make dental cleaning fast and effective.

[0016] A further objective is to provide a dental cleaning device able to improve the overall efficiency of dental cleaning operations.

[0017] A further objective is to provide a dental cleaning device able to improve the subject's comfort during dental cleaning procedures.

[0018] A further objective is to provide a dental cleaning device able to automatize the process of cleaning teeth.

[0019] A further objective is to provide a dental cleaning device able to improve the adaptability of brush heads to the user's teeth.

[0020] A further objective is to reduce the manufacturing costs of the dental cleaning device while maintaining its effectiveness.

[0021] These scopes and more, which will appear more from the following description, are substantially achieved by a dental cleaning device in accordance with one or more of the following claims and / or aspects.

[0022] SUMMARY SECTION

[0023] Second embodiment

[0024] A 1st aspect is directed to a dental cleaning device (1000) comprising: a handle (2) configured for being grabbed by a user; a mouthpiece (100) connected or connectable to said handle (2) and configured for being inserted into the user’s mouth, wherein the mouthpiece (100) defines an arcuate profile; sets of brush heads (200) positioned on the mouthpiece (100) and configured for cleaning, during a use condition of said dental cleaning device, the user’s teeth, a motor operatively connected to said sets of brush heads (200) and configured to cause a vibration motion of said sets of brush heads (200); a transmission system connecting kinematically the motor to the sets of brush heads (200), wherein the transmission system includes at least one motion-transfer rod (500) operatively connected to the motor and extending along the arcuate profile of the mouthpiece (100).

[0025] In a 2nd aspect according to the preceding aspect, the arcuate profile of the mouthpiece (100) comprises a left branch (120), a right branch (130) and a front portion (110) interposed in connection between the left branch (120) and the right branch (130), defining the arcuate profile of the mouthpiece (100).

[0026] In a 3rd aspect according to the preceding aspect, the left branch (120), the front portion (110) and the right branch (130) of the mouthpiece (100) are consecutive to each other defining the arcuate profile of the mouthpiece (100).

[0027] In a 4th aspect according to any one of the preceding aspects, the mouthpiece (100) is arch-shaped.

[0028] In a 5th aspect according to any one of the preceding aspects, the mouthpiece (100) is made of plastic material.

[0029] In a 6th aspect according to any one of the preceding aspects, the mouthpiece (100) is removably attachable to the handle (2).

[0030] In an aspect 6 bis according to any one of the preceding aspects, the sets of brush heads (200) are fixed to the at least one motion-transfer rod (500).

[0031] In a 7th aspect according to any one of the preceding aspects, the mouthpiece (100) is symmetrical with respect to a plane of symmetry passing through the front portion (110).

[0032] In a 8th aspect according to any one of the preceding aspects, at least one of said at least one motion-transfer rod (500) extends in one piece along said arcuate profile of the mouthpiece (100).

[0033] In a 9th aspect according to any one of the preceding aspects, the sets of brush heads (200) move together with the at least one motion-transfer rod (500).

[0034] In a 10th aspect according to any one of the preceding aspects, the at least one motiontransfer rod (500) is movable along the mouthpiece (100), and with respect to the mouthpiece (100), according to a translational motion.

[0035] In a 11th aspect according to the preceding aspect, the sets of brush heads (200) move together with the at least one motion-transfer rod (500) according to the same translational motion.

[0036] In a 12th aspect according to any one of the preceding aspects, the arcuate profile of the mouthpiece (100) includes a groove guide (150), in particular defining a channel, extending continuously along the arcuate profile of the mouthpiece (100), in particular along the front portion (110), the left branch (120) and the right branch (130) of the mouthpiece (100).

[0037] In a 13th aspect according to the preceding aspect, the at least one motion-transfer rod (500) is arranged at least partially within said groove guide (150), wherein the at least one motion-transfer rod (500) is configured to move, in particular to slide, with respect to the mouthpiece (100) within said groove guide (150) to cause a vibration motion of the sets of brush heads (200).

[0038] In a 14th aspect according to any one of the preceding aspects 12 and 13, the at least one motion-transfer rod (500) is configured to flex, in particular to bend, while moving within said groove guide (150) to follow the arcuate profile of the mouthpiece (100).

[0039] In an aspect 14 bis according to any one of the preceding aspects, the at least one motiontransfer rod (500) is configured to flex, in particular to bend, while moving along the mouthpiece (100).

[0040] In an aspect 14 ter according to the preceding aspect, the at least one motion-transfer rod (500) is configured to flex at least around an axis orthogonal to a mouthpiece virtual plane, optionally said axis being variable in position along the at least one motion-transfer rod (500), the mouthpiece virtual plane comprising the arcuate profile of the mouthpiece.

[0041] In an aspect 14 quater according to any one of the preceding aspects, the at least one motion-transfer rod (500) is configured to flex, in particular to bend, to enable its movement along the arcuate profile of the mouthpiece (100).

[0042] In an aspect 14 quinquies according to any one of the preceding aspects in combination with aspect 12, said groove guide (150) comprises a rear wall (150c), a first side wall (150a) attached transversally to the rear wall (150c), and a second side wall (150b) attached transversally to the rear wall (150c), wherein the first side wall (150a) faces the second side wall (150b), and wherein the rear wall (150c) is interposed in connection between the first side wall (150a) and the second side wall (150b).

[0043] In an aspect 14 sexies according to the preceding claim, the at least one motion-transfer rod (500) contacts the rear wall (150c) of the groove guide.

[0044] In an aspect 14 septies according to any one of the two preceding aspects, the rear wall (150c) extends along the arcuate profile of the mouthpiece, wherein the at least one motiontransfer rod (500) extends continuously along the rear wall (150c), the at least one motiontransfer rod (500) facing continuously the rear wall (150c) of the groove guide (150).

[0045] In a 15th aspect according to any one of the preceding aspects, said at least one motiontransfer rod (500) is made of plastic material, optionally the at least one motion-transfer rod (500) being in one piece.

[0046] In a 16th aspect according to any one of the preceding aspects, the at least one motiontransfer rod (500) comprises a first motion-transfer rod (500a) and a distinct second motiontransfer rod (500b) both extending along the arcuate profile of the mouthpiece (100). In a 17th aspect according to the preceding aspect, the first motion-transfer rod (500a) and the second motion-transfer rod (500b) extend continuously along the front portion (110), the left branch (120) and the right branch (130) of the mouthpiece (100).

[0047] In a 18th aspect according to any one of the preceding aspects 16 and 17, the second motion-transfer rod (500b) is positioned internally to the first motion-transfer rod (500a) with respect to the arcuate profile of the mouthpiece (100).

[0048] In a 19th aspect according to any one of the preceding aspects in combination with aspect 16, the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are positioned side by side all along the arcuate profile of the mouthpiece (100).

[0049] In an aspect 19bis according to any one of the preceding aspects in combination with aspect 16, the brush heads of said sets are fixed to both the first motion-transfer rod (500a) and the second motion-transfer rod (500b).

[0050] In a 20th aspect according to any one of the preceding aspects in combination with aspect 16, the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are in contact to each other all along the arcuate profile of the mouthpiece (100).

[0051] In a 21st aspect according to any one of the preceding aspects in combination with aspect 16, the first motion-transfer rod (500a) is engaged by a connection coupling (501) to the second motion-transfer rod (500b) at a mutual central region located substantially at the front portion (110) of the mouthpiece (100).

[0052] In a 22nd aspect according to the preceding aspect, said central region of the first and second motion-transfer rods (500a, 500b) are equidistant from the left branch (120) and the right branch (130) of the mouthpiece, in particular a plane of symmetry of the mouthpiece (100) crossing said central region of the first and second motion-transfer rods (500a, 500b). In a 23th aspect according to any one of the two preceding aspects, said connection coupling is configured to transfer a vibration motion of the first motion-transfer rod (500a) to the second motion-transfer rod (500b) so that the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are movable together according to the same vibration motion.

[0053] In a 24th aspect according to any one of the preceding aspects in combination with aspect 21 , the first motion-transfer rod (500a) is engaged to the second motion-transfer rod (500b) only at said mutual central region.

[0054] In a 25th aspect according to any one of the preceding aspects in combination with aspect 21 , the first motion-transfer rod (500a) at the left branch (120) and the right branch (130) is disengaged from the second motion-transfer rod (500b).

[0055] In a 26th aspect according to any one of the preceding aspects in combination with aspect 21 , a kinematic component of the transmission system connects the motor to the first motion-transfer rod (500) at said mutual central region. In a 27th aspect according to any one of the preceding aspects in combination with aspect 21 , the connection coupling comprises at least one protrusion and at least one recess respectively arranged on the first motion-transfer rod (500a) and on the second motiontransfer rod (500b) or vice versa, said recess receiving the protrusion defining the connection coupling.

[0056] In a 28th aspect according to any one of the preceding aspects in combination with aspect 16, each one of the first motion-transfer rod (500a) and the second motion-transfer rod (500b) is made in one piece.

[0057] In a 29th aspect according to any one of the preceding aspects in combination with aspect 16, each one of the first motion-transfer rod (500a) and the second motion-transfer rod (500b) is made of plastic material.

[0058] In a 30th aspect according to any one of the preceding aspects in combination with aspect 16, the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are made of the same material.

[0059] In a 31st aspect according to any one of the preceding aspects, the sets of brush heads (200) comprise at least an external set (200a) of brush heads (200) for cleaning an external surface of the user’s teeth, and an internal set (200b) of brush heads (200) for cleaning an internal surface of the user’s teeth.

[0060] In a 32nd aspect according to the preceding aspect, the external set (200a) of brush heads (200) and the internal set (200b) of brush heads (200) are separated and independent to each other.

[0061] In a 33rd aspect according to the preceding aspect and in combination with aspect 16, the external set (200a) of brush heads (200) is fixed only to the first motion-transfer rod (500a), and the internal set (200b) of brush heads (200) is fixed only to the second motion-transfer rod (500a).

[0062] In a 34th aspect according to any one of the preceding aspects, the sets of brush heads (200) comprise an occlusive set (200c) of brush heads (200) for cleaning a top region of the user’s teeth.

[0063] In a 35th aspect according to the preceding aspect, each of the brush heads (200) of said occlusive set (200c) is fixed either to the first motion-transfer rod (500a) or to the second motion-transfer rod (500b).

[0064] In a 36th aspect according to any one of the two preceding aspects, each of the brush heads (200) of said occlusive set (200c) are fixed only to the first motion-transfer rod (500a) or only to the second motion-transfer rod (500b).

[0065] In a 37th aspect according to any one of the preceding aspects in combination with aspect 34, bristles of the occlusive set (200c) of the brush heads (200) extend away from a plane defined by the arcuate profile of the mouthpiece (100). In a 38th aspect according to any one of the preceding aspects in combination with aspect 34, the bristles of the occlusive set (200c) of the brush heads (200) are oriented substantially orthogonal the a plane comprising the arcuate profile of the mouthpiece (100).

[0066] In a 39th aspect according to any one of the preceding aspects in combination with aspect 34, the occlusive set (200c) of brush heads (200) are interposed between the external set (200a) of brush heads (200) and the internal set (200b) of brush heads (200).

[0067] In a 40th aspect according to any one of the preceding aspects in combination with aspect 34, the occlusive set (200c) of brush heads (200) are positioned only at the left branch (120) and / or right branch (130) of the mouthpiece (100) for cleaning the top region of user’s molar teeth, optionally also the user’s premolar teeth.

[0068] In a 41st aspect according to any one of the preceding aspects in combination with aspect 34, the occlusive set (200c) of brush heads (200) comprise supporting walls (201c) distinct to each other and supporting the respective bristles (202c), said supporting walls (201c) of the occlusive set (200c) of brush heads (200) comprising one or more, optionally two or more, protrusions (203c), for example protruding pins, in particular extending opposite to the bristles (202c).

[0069] In a 42nd aspect according to the preceding aspect, the first motion-transfer rod (500a) comprises a first series of recesses (501a) extending in line along the left branch (120) and / or the right branch (130), wherein the second motion-transfer rod (500b) comprises a second series of recesses (501 b) extending in line along the left branch (120) and / or the right branch (130), both the first and the second series of recesses (501a, 501 b) being adapted to receive the protrusions (203c) of the supporting walls of occlusive set (200c) of the brush heads.

[0070] In a 43rd aspect according to the preceding aspect, said recesses of the first series (501a) are staggered with respect to said recesses of the second series (501 b) to increase a spatial resolution for positioning the occlusive set of brush heads (200).

[0071] In a 44th aspect according to the preceding aspect, each recess of the first series of recesses (501a) is interposed, according to a direction parallel to said in line extension of the first series of recesses (501a), between the recesses of the second series (501b).

[0072] In a 45th aspect according to any one of the two preceding aspects, a virtual line (VL), passing through a center of a recess of the first series (501a) orthogonally to the line extension of the first series of recesses (501a), passes between two adjacent recesses of the second series (501b).

[0073] In a 46th aspect according to any one of the preceding aspects in combination with aspect 41 , the protrusions (203c) of a single supporting wall (201c) of the occlusive set (200c) of brush heads (200) are inserted either into the recesses (501a) of the first motion-transfer rod (500a) or into the recesses (501b) of the second motion-transfer rod (500b). In an aspect 46 bis according to any one of the preceding aspects in combination with aspect 42, the first series of recesses (501a) and the second series of recesses (501 b) extend in depth along a direction orthogonal to a plane comprising the arcuate profile of the mouthpiece (100), i.e. the mouthpiece virtual plane VP.

[0074] In an aspect 46 ter according to any one of the preceding aspects in combination with aspect 42, the first series of recesses (501a) and the second series of recesses (501 b) are positioned in line on a top wall of respectively the first motion-transfer rod 500a and the second motion-transfer rod 500b.

[0075] In an aspect 46 quater according to any one of the preceding aspects from 42 to 46, the first series of recesses (501a) and the second series of recesses (501b) extend in depth along a direction substantially parallel to a plane comprising the arcuate profile of the mouthpiece (100), i.e. the mouthpiece virtual plane VP.

[0076] In an aspect 46 quinquies according to any one of the preceding aspects from 42 to 46 and 46 quater, the first series of recesses (501a) and the second series of recesses (501b) are positioned in line on a side surface of respectively the first motion-transfer rod 500a and the second motion-transfer rod 500b, in particular wherein the side surface is substantially orthogonal to the mouthpiece virtual plane VP.

[0077] In an aspect 46 sexies according to the preceding aspect, the side surface of the first motion-transfer rod 500a carrying the first series of recesses 501a faces internally with respect to the arcuate profile of the mouthpiece, while the side surface of the second motiontransfer rod 500b carrying the second series of recesses 501b faces externally with respect to the arcuate profile of the mouthpiece.

[0078] In an aspect 46 septies according to any one of the two preceding aspects, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, in particular within the groove guide 150, the first series of recesses 501a faces the second series of recesses 501b.

[0079] In an aspect 46 octies according to any one of the preceding aspects from 46 quarter to 46 septies, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, in particular within the groove guide 150, the first series of recesses 501a are staggered with respect to the second series of recesses 501 b to increase a spatial resolution for positioning the occlusive set 200c of brush heads 200 along the extension of the mouthpiece.

[0080] In an aspect 46 novies according to the preceding aspect, each recess of the first series of recesses 501a is interposed, according to a direction parallel to said in line extension of the first series of recesses 501a, between the recesses of the second series 501 b.

[0081] In an aspect 46 decies according to any one of the preceding aspects from 46 quarter to 46 novies, each brush head of the occlusive set 200c comprises a tab 204c protruding from the respective supporting wall 201c opposite to the bristles, wherein the protrusions 203c of the occlusive set 200c are carried by said tab 204c.

[0082] In an aspect 46 undecies according to the preceding aspect, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, specifically within the groove guide 150, the tab 204c of the occlusive set 200c of brush heads is interposed, optionally by contact, between the first motion-transfer rod 500a and the second motion-transfer rod 500b.

[0083] In an aspect 46 duodecies according to the preceding aspect, the protrusions 203c of the tab 204c remain engaged within the first or second series of recesses 501a, 501 b and cannot disengage unless the first and second motion-transfer rods 500a, 500b are separated to each other.

[0084] In a 47th aspect according to any one of the preceding aspects, the dental cleaning device comprises at least one lateral wall (502) extending in height from said at least one motiontransfer rod (500) transversal to a motion plane of the at least one motion-transfer rod (500), said at least one lateral wall (502) carrying, or being configured to carry, the sets of brush heads (200).

[0085] In a 48th aspect according to the preceding aspect, said lateral wall (502) is arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), optionally the lateral wall being positioned at the left branch (120), the right branch (130) and the front portion (110).

[0086] In an aspect 48 bis according to any one of the preceding aspects in combination with aspect 47, the at least one lateral wall (502) has a thickness comprised between 0,5 mm and 2 mm, optionally between 0,9 mm and 1 ,8 mm.

[0087] In a 49th aspect according to any one of the preceding aspects in combination with aspect 47, said at least one lateral wall (502) comprises an outer surface facing outwardly the arcuate profile of the mouthpiece (100), and an inner surface facing inwardly the arcuate profile of the mouthpiece (100).

[0088] In a 50th aspect according to the preceding aspect, each brush head of the sets of brush heads are selectively mountable at the outer surface and the inner surface of said lateral wall (502) of the at least one motion-transfer rod (500).

[0089] In a 51st aspect according to any one of the preceding aspects in combination with aspect 47, each brush head of the sets of brush heads are coupled to the lateral wall (502) by ultrasonic welding.

[0090] In an aspect 51 bis according to any one of the preceding aspects in combination with aspect 47, each brush head of the sets of brush heads are coupled to the lateral wall (502) by a biocompatible glue, optionally a UV glue. In an aspect 51 ter according to any one of the preceding aspects in combination with aspect 47, the lateral wall (502) comprises a left branch lateral wall (502L) and a right branch lateral wall (502R) respectively positioned at the left branch (120) and the right branch (130) of the mouthpiece (100), wherein said left branch lateral wall (502L) and right branch lateral wall (502R) carrying, or being configured to carry, posterior brush heads (200) for cleaning user’s posterior teeth, in particular the posterior teeth including at least one between molar and a premolar teeth.

[0091] In an aspect 51 quater according to the preceding aspect, the left branch lateral wall (502L) is configured to carry two or more sets of brush heads (200), in particular two or more supporting walls, distinct to each other, of brush heads.

[0092] In an aspect 51 quinquies according to the preceding aspect, the right branch lateral wall (502R) is configured to carry two or more sets of brush heads (200), in particular two or more supporting walls, distinct to each other, of brush heads.

[0093] In an aspect 51 sexies according to any one of the preceding aspects in combination with aspect 51 ter, the left branch lateral wall (502L) and the right branch lateral wall (502R) extend along a length extension and a height extension, the length extension being directed respectively along the extension of the left branch (120) and the right branch (130) of the mouthpiece (100), and the height extension being transversal to the length extension away from the mouthpiece (100), in particular wherein the length extension is greater than the height extension.

[0094] In an aspect 51 septies according to the preceding aspect, the height extension of the left branch lateral wall (502L) and the right branch lateral wall (502R) decreases, in particular linearly, approaching an end of the left branch (120) and the right branch (130).

[0095] In an aspect 51 octies according to any one of the preceding aspects in combination with aspect 51 ter, the left branch lateral wall (502L) and the right branch lateral wall (502R) extends respectively along the left branch (120) and the right branch (130) in a continuous manner, in particular defining a continuous surface.

[0096] In an aspect 51 novies according to any one of the preceding aspects in combination with aspect 51 ter, the left branch lateral wall (502L) comprises an internal left branch lateral wall positioned internally with respect to the arcuate profile of the mouthpiece (100), and an external left branch lateral wall positioned externally with respect to the arcuate profile of the mouthpiece (100), wherein the external left branch lateral wall is fixed to, in particular being part of, the first motion-transfer rod (500a), wherein the internal left branch lateral wall is fixed to, in particular being part of, the second motion-transfer rod (500b). In an aspect 51 decies according to any one of the preceding aspects in combination with aspect 51 ter, the right branch lateral wall (502R) comprises an internal right branch lateral wall positioned internally with respect to the arcuate profile of the mouthpiece (100), and an external right branch lateral wall positioned externally with respect to the arcuate profile of the mouthpiece (100), wherein the external right branch lateral wall is fixed to, in particular being part of, the first motion-transfer rod (500a), wherein the internal right branch lateral wall is fixed to, in particular being part of, the second motion-transfer rod (500b).

[0097] In an aspect 51 undecies according to any one of the preceding aspects in combination with aspect 51 ter, the lateral wall (502) comprises a front lateral wall (502F) positioned at the front portion (110) of the mouthpiece, said front lateral wall (502F) carrying, or being configured to carry, front brush heads (200) for cleaning user’s front teeth, in particular the front teeth including at least one between incisor and canine teeth.

[0098] In an aspect 51 duodecies according to the preceding aspect, the front lateral wall (502F) comprises two or more external front lateral walls, distinct and separated to each other, positioned externally with respect to the arcuate profile of the mouthpiece (100), each one of the external front lateral walls carrying, or being configured to carry, a single brush head of the sets of brush heads, optionally said external front lateral walls being fixed to, or being part of, the first motiontransfer rod (500a).

[0099] In an aspect 51 ter decies according to any one of the two preceding aspects, the front lateral wall (502F) comprises two or more internal front lateral walls, distinct and separated to each other, positioned internally with respect to the arcuate profile of the mouthpiece (100), each one of the internal front lateral walls carrying, or being configured to carry, a single brush head of the sets of brush heads, optionally said internal front lateral walls being fixed to, or being part of, the second motiontransfer rod (500b).

[0100] In an aspect 51 quaterter decies according to any one of the two preceding aspects in combination with aspect 51 duodecies, the two or more external front lateral walls are connected to each other only through a bottom portion of the at least one motion-transfer rod (500), in particular of the first motion-transfer rod (500a), wherein the bottom portion of the at least one motion-transfer rod (500) is positioned at the level of the motion plane.

[0101] In an aspect 51 quindecies according to any one of the two preceding aspects in combination with aspect 51 ter decies, the two or more internal front lateral walls are connected to each other only through a bottom portion of the at least one motion-transfer rod (500), in particular of the second motion-transfer rod (500b), wherein the bottom portion of the at least one motion-transfer rod (500) is positioned at the level of the motion plane.

[0102] In a 52nd aspect according to any one of the preceding aspects in combination with aspect 41 , the protrusions (203) on the supporting walls (201c) of the occlusive set (200c) of brush heads (200) are positioned on toward a side of said supporting walls (201c).

[0103] In a 53rd aspect according to the preceding aspect, given a medial axis (MA) of said supporting wall (201c) equidistant from an external side an internal side of said supporting wall (201c) of the occlusive set (200c), the protrusions (203) are positioned only on one side with respect to the medial axis (MA).

[0104] In a 54th aspect according to the preceding aspect, the medial axis (MA) is parallel to the in line extension of the recesses (501a, 501 b).

[0105] In a aspect 54bis according to any one of the preceding aspects in combination with aspect 16, the at least one lateral wall (502) comprises an external lateral wall (502a) extending in height from the at least one motion-transfer rod (500), transversal to a motion plane of the at least one motion-transfer rod (500), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), in particular wherein the external lateral wall (502a) is external to the arcuate profile of the mouthpiece (100).

[0106] In a aspect 54ter according to any one of the preceding aspects in combination with aspect 16, the at least one lateral wall (502) comprises an internal lateral wall (502b) extending in height from the at least one motion-transfer rod (500), transversal to a motion plane of the at least one motion-transfer rod (500), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), in particular wherein the internal lateral wall (502b) is internal to the arcuate profile of the mouthpiece (100).

[0107] In a 55th aspect according to any one of the preceding aspects in combination with aspect 16, the at least one lateral wall (502) comprises an external lateral wall (502a) extending in height from the first motion-transfer rod (500a), transversal to a motion plane of the first motion-transfer rod (500a), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100).

[0108] In a 56th aspect according to the preceding aspect, the supporting walls of the external set (200a) of brush heads (200) are fixed to said external lateral wall (502a) of the first motiontransfer rod (500a).

[0109] In a 57th aspect according to any one of the preceding aspects in combination with aspect 16, the at least one lateral wall (502) comprises an internal lateral wall (502b) extending in height from the second motion-transfer rod (500b), transversal to a motion plane of the second motion-transfer rod (500a) in particular corresponding to the motion plane of the first motion-transfer rod (500a), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100).

[0110] In a 58th aspect according to the preceding aspect, the supporting walls of the internal set (200b) of brush heads (200) are fixed to said internal lateral wall (502b) of the second motion-transfer rod (500b).

[0111] In a 59th aspect according to any one of the preceding aspects, the supporting walls of the internal set (200b) of brush heads (200) are independent from the supporting walls of the external set (200a) of brush heads (200).

[0112] In a 60th aspect according to any one of the preceding aspects in combination with aspect 16, the supporting walls of the brush heads (200) are mountable both at an inner surface and an outer surface of said external lateral wall (502a) of the first motion-transfer rod (500a).

[0113] In a 61st aspect according to any one of the preceding aspects in combination with aspect 16, the supporting walls of the brush heads (200) are mountable both at an inner surface and an outer surface of said internal lateral wall (502b) of the second motion-transfer rod (500b).

[0114] In a 62nd aspect according to any one of the preceding aspects in combination with aspect 55, the external lateral wall (502a) is external to the arcuate profile of the mouthpiece (100). In a 63rd aspect according to any one of the preceding aspects in combination with aspect 57, the internal lateral wall (502b) is internal to the arcuate profile of the mouthpiece (100). In a 64th aspect according to any one of the preceding aspects, the at least one motiontransfer rod (500) is movable along the mouthpiece (100) back and forth around a middle position defining a vibration motion of the sets of brush heads (200).

[0115] In a 65th aspect according to the preceding aspect, said vibration motion has a respective frequency and amplitude around said middle position, wherein said frequency is comprised between16 Hz and 34 Hz, and said amplitude is comprised between 0,7 mm and 3 mm, optionally between 1 ,5 mm and 2 mm, in particular 2 mm.

[0116] In a 66th aspect according to any one of the two preceding aspects, the sets of brush heads (200) are fixed to the at least one motion-transfer rod (500) to move according to said vibration motion.

[0117] In a 67th aspect according to any one of the preceding aspects in combination with aspect 64, said vibration motion is a translational motion.

[0118] In a 68th aspect according to any one of the preceding aspects, the motor is arranged in an internal volume of the handle (2), said motor being an electric motor.

[0119] In a 69th aspect according to any one of the preceding aspects, the motor is kinematically connected to the at least one motion-transfer rod (500) by a rod-crank kinematic system. In a 70th aspect according to any one of the preceding aspects, the at least one motiontransfer rod (500) comprises a cavity (505) at the front portion of the mouthpiece, said cavity (505) being configured to receive a drive pin (2a) of the handle (2) operatively connected to the motor.

[0120] In a 71st aspect according to the preceding aspect, the drive pin (2a) is configured to move laterally in a vibration movement driven by the motor.

[0121] In a 72nd aspect according to the preceding aspect, the vibration movement of the drive pin (2a) of the handle is a translational movement.

[0122] In a 73rd aspect according to any one of the two preceding aspects, the vibration movement of the drive pin has the same frequency of the vibration motion of the at least one motiontransfer rod (500).

[0123] In an aspect 73bis according to any one of the preceding aspects in combination with aspect 47, the at least one lateral wall (502) comprises a lateral series of recesses (504), in particular extending in line along the left branch 120 and the right branch 130 of the mouthpiece 100.

[0124] In an aspect 74 ter according to the preceding aspect, the lateral series of recesses (504) are positioned on both lateral walls of the first and second motion-transfer rods (500a, 500b), in particular positioned on the left branch lateral wall (502L) and the right branch lateral wall (502R).

[0125] In an aspect 74 quarter according to any one of the preceding two aspects, the lateral series of recesses (504) are positioned on the external left branch lateral wall and the external right branch lateral wall.

[0126] In an aspect 74 quinquies according to any one of the preceding three aspects, the lateral series of recesses (504) are positioned on the internal left branch lateral wall and the internal right branch lateral wall.

[0127] In an aspect 74 sexies according to any one of the preceding three aspects in combination with aspect 73 bis, brush heads of the set of brush heads (200) comprise a respective supporting wall (201), bristles (202) fixed to the supporting wall (201), and protrusions (203) extending from said supporting wall (201), wherein said protrusions (203) are configured to be coupled to the lateral series of recesses (504).

[0128] In an aspect 74 septies according to the preceding aspect, said protrusions (203) are configured to fit into said lateral series of recesses (504).

[0129] In an aspect 74 octies according to any one of the preceding three aspects in combination with aspect 73 bis, the at least one lateral wall (502), in particular each of the left branch lateral wall (502L) and the right branch lateral wall (502R), comprises a first lateral series of recesses (504’) and a second lateral series of recesses (504”) parallel to each other and separated to each other in height. In an aspect 74 novies according to the preceding aspect, both the first lateral series of recesses (504’) and the second lateral series of recesses (504”) are configured to receive within said protrusions (203d) of the brush heads.

[0130] In an aspect 74 decies according to the preceding aspect, in a mounted configuration, said protrusions (203d) of the brush heads are received either into the first lateral series of recesses (504’) or the second lateral series of recesses (504”) to allow customization in position of the brush heads in height, in particular wherein said height is considered with respect to the plane comprising the arcuate profile of the mouthpiece, i.e. the mouthpiece virtual plane.

[0131] In a 74th aspect according to any one of the preceding aspects in combination with aspect 72, the translational movement is parallel to a plane comprising the arcuate profile of the mouthpiece (100).

[0132] An independent aspect 75 is directed to a manufacturing process of the dental cleaning device (1000) of any one of the preceding aspects, wherein said process comprises: providing the handle (2), the mouthpiece (100), the sets of brush heads (200), and the at least one motion-transfer rod (500), wherein said at least one motion-transfer rod (500) comprises at least one lateral wall (502) extending in height, transversal to a motion plane of the at least one motion-transfer rod (500), wherein said at least one lateral wall (502) comprises an outer surface, facing outwardly the arcuate profile of the mouthpiece (100), and an inner surface facing inwardly the arcuate profile of the mouthpiece (100); scanning the user’s dental arch; determining whether to couple the brush heads (200) of said sets to the inner surface or the outer surface of the lateral wall (502) of the at least one motion-transfer rod (500) based on a size of each tooth or of the dental arch obtained by the scanning step.

[0133] In a 76th aspect according to the preceding aspect, the manufacturing process comprises the following step, in particular to be performed after the determination step: coupling the brush heads (200) to the inner surface or the outer surface of the lateral wall (502) of the at least one motion-transfer rod (500b) based on the determination step.

[0134] In a 77th aspect according to any one of the two preceding aspects, the at least one motiontransfer rod (500) comprises a first motion-transfer rod (500a) and a distinct second motiontransfer rod (500b) both extending along the arcuate profile of the mouthpiece (100).

[0135] In a 78th aspect according to the preceding aspect, the first motion-transfer rod (500a) comprises an external lateral wall extending in height, transversal to a motion plane of the first motion-transfer rod (500a), and optionally arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100).

[0136] In a 79th aspect according to any one of the two preceding aspects, the second motiontransfer rod (500b) comprises an internal lateral wall extending in height, transversal to a motion plane of the second motion-transfer rod (500a) in particular corresponding to the motion plane of the first motion-transfer rod (500a), and optionally arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100).

[0137] In a 80th aspect according to the aspects 78 and 79, an external set (200a) of brush heads (200) are fixable to said external lateral wall of the first motion-transfer rod (500a), and an internal set (200b) of brush heads (200) are fixable to said internal lateral wall of the second motion-transfer rod (500a).

[0138] In a 81st aspect according to any one of the preceding aspect in combination with aspect 76, the manufacturing process comprises to couple: the external set (200a) of brush heads (200) either to the inner surface or to the outer surface of the external lateral wall based on the determination step, and the internal set (200b) of brush heads (200) either to the inner surface or to the outer surface of the internal lateral wall based on the determination step.

[0139] In a 82nd aspect according to any one of the preceding aspect in combination with aspect 76, the step of coupling the supporting walls of the brush heads to the lateral wall 502, optionally to the external lateral wall and to the internal lateral wall, is performed by ultrasonic welding.

[0140] In a 83rd aspect according to any one of the preceding aspects in combination with aspect 75, the scanning step is performed by scanner 3D or scanner 2D or by making a cast of the dental arch, for example a plaster cast.

[0141] In a 84th aspect according to any one of the preceding aspects in combination with aspect 75, the determination step further comprises determining a height with respect to said motion plane at which to fix a brush head of the sets of brush heads to the at least one lateral wall (502), in particular said height being determined for each brush head of the sets of brush heads.

[0142] In a 85th aspect according to the preceding aspect, said height is measured as a distance from the motion plane up to a first bristle of said brush head.

[0143] In a 86th aspect according to any one of the two preceding aspects 84 and 85, the coupling step comprises coupling each brush head of the sets of brush heads at said height with respect to said motion plane, in particular coupling each brush head of the sets of brush heads at a respective height with respect to said motion plane defined at the determination step. In a 86th aspect according to any one of the preceding aspects in combination with aspects 75 and 43, the determination step comprises determining whether to couple the occlusive set (200c) of brush heads (200) either to the first series of recesses (501a) of the first motion-transfer rod (500a) or to the second series of recesses (501b) of the second motiontransfer rod (500b).

[0144] In a 87th aspect according to any one of the preceding aspects in combination with aspects 75 and 43, the determination step may comprise determining the position of each brush head 200 of the occlusive set 200c, namely whether to couple: a first brush head 200 of the occlusive set 200c either to the first series of recesses 501a of the first motion-transfer rod 500a or to the second series of recesses 501 b of the second motion-transfer rod 500b, and whether to couple a second brush head 200 of the occlusive set 200c either to the first series of recesses 501a of the first motion-transfer rod 500a or to the second series of recesses 501 b of the second motion-transfer rod 500b.

[0145] In a 88th aspect according to any one of the preceding aspects, the at least one motiontransfer rod 500 is configured to transmit both compressive and tensile loads to move the sets of brush heads back and forth.

[0146] In a 89th aspect according to any one of the preceding aspects, the motion plane of the at least one motion-transfer rod (500) comprises the arcuate profile of the mouthpiece (100). In a 90th aspect according to any one of the preceding aspects, the at least one motion transfer rod (500) comprises a continuous structural profile (550) following the arcuate profile of the mouthpiece (100), in particular extending between the left branch (120) up to the right branch (130), to transmit the vibration motion to the set of brush heads.

[0147] In a 91st aspect according to the preceding aspect, the continuous structural profile (550) is positioned completely within the groove guide (150), in particular the continuous structural profile (550) facing the rear wall (150c) of the groove guide (150).

[0148] In a 92nd aspect according to any one of the two preceding aspects, a motion plane of the at least one motion-transfer rod (500) comprises the continuous structural profile (550).

[0149] In a 93rd aspect according to any one of the preceding aspects from 90 to 92, the continuous structural profile (550) facing the rear wall (150c) of the groove guide (150) extends continuously, without interruption, from the left branch (120) to the right branch (130).

[0150] In a 94th aspect according to any one of the preceding aspects in combination with aspect 75, the at least one lateral wall (502) comprises a lateral series of recesses (504), in particular extending in line along the left branch (120) and the right branch (130) of the mouthpiece (100), the at least one lateral wall (502) comprising a first lateral series of recesses (504’) and a second lateral series of recesses (504”) parallel to each other and separated to each other in height, wherein the coupling step comprises to couple protrusions (203d) of the brush heads either to the first lateral series of recesses (504’) or the second lateral series of recesses (504”).

[0151] DRAWINGS

[0152] Some embodiments and some aspects of the invention will be described below with reference to the attached drawings, provided for illustrative purposes only, wherein:

[0153] Figures 1 and 2 are a perspective views of a dental cleaning device according to the invention;

[0154] Figure 3 is a plain view from an upper side of the dental cleaning device according to the invention;

[0155] Figure 4 is a plain view from a lower side of the dental cleaning device according to the invention;

[0156] Figures 5 and 6 are detailed views of the mouthpiece and the motion-transfer rod of the dental cleaning device according to the invention;

[0157] Figure 7 is a plain view from a lower side of the mouthpiece of the dental cleaning device according to the invention, wherein the brush heads are removed from the mouthpiece;

[0158] Figure 8 is a detailed view of the mouthpiece and the brush heads of the dental cleaning device according to the invention;

[0159] Figure 9 is a cross section view of the dental cleaning device shown in figure 8 along a plane orthogonal to the back module rotation axes at the level of the kinematic joint between the motion-transfer rod and the back modules;

[0160] Figure 10 shows the motion-transfer rod and the brush heads of the dental cleaning device according to the invention;

[0161] Figure 11 is a perspective view from a lower side of the mouthpiece of the dental cleaning device according to the invention, wherein the brush heads are removed from the mouthpiece;

[0162] Figure 12 is a perspective view of an internal portion of the handle of the dental cleaning device according to the invention;

[0163] Figure 13 is a schematic view of the rod-crank kinematic system connecting the motor to the motion-transfer rod;

[0164] Figure 14 is a plain view of a back module of the dental cleaning device according to the invention;

[0165] Figure 15 is a perspective view of a back module of the dental cleaning device according to the invention; Figure 16 is a plain view of a front module of the dental cleaning device according to the invention;

[0166] Figure 17 is a perspective view of a front module of the dental cleaning device according to the invention;

[0167] Figure 18 is a perspective view of an alternative embodiment of the motion-transfer rod of the mouthpiece according to the invention;

[0168] Figures 19 and 20 are views of a dental cleaning device according to a second embodiment of the invention;

[0169] Figure 21 is a perspective view of the handle of the dental cleaning device according to the second embodiment of the invention;

[0170] Figure 22 is a perspective view of the mouthpiece carrying the motion-transfer rod of the dental cleaning device according to the second embodiment of the invention; Figure 23 is a plain view in detail of the mouthpiece carrying the motion-transfer rod of the dental cleaning device according to the second embodiment of the invention; Figures 24 and 25 are detailed views of the occlusive brush heads of the dental cleaning device according to the second embodiment of the invention;

[0171] Figures 26 and 27 are exploded views of the first and second motion-transfer rods of the dental cleaning device according to the second embodiment of the invention; Figure 28 is a perspective view of the first motion-transfer rod of the dental cleaning device according to the second embodiment of the invention;

[0172] Figure 29 is a perspective view of the second motion-transfer rod of the dental cleaning device according to the second embodiment of the invention;

[0173] Figure 30 is a perspective view of the mouthpiece without the motion-transfer rod of the dental cleaning device according to the second embodiment of the invention;

[0174] Figure 31 is a schematic representation of the manufacturing process 2000;

[0175] Figures 32 and 33 show an alternative configuration of the first and second motiontransfer rods comprising a series of recesses for coupling the brush heads;

[0176] Figures 34 and 35 show a posterior lateral set of brush heads comprising protrusions for coupling to the motion-transfer rod;

[0177] Figures 36 and 37 show an occlusive set of brush heads comprising protrusions for coupling to the motion-transfer rod;

[0178] Figure 38 is an assembly view of the alternative configuration according to Figs. 32- 37;

[0179] Figure 39 is a front view of the assembly of Fig. 38;

[0180] Figure 39A shows a cross-sectional view of the assembly of Fig. 39 through the tab of the occlusive set of brush heads. DETAILED DESCRIPTION

[0181] Dental cleaning device 1 - first embodiment

[0182] Reference number 1 is directed to a dental cleaning device, shown in the attached figures 1-18, for oral hygiene of a user. The dental cleaning device 1 may be an electric toothbrush. In generic terms, the dental cleaning device 1 may comprise a handle 2, a mouthpiece 10, a set of brush heads 20, and a motor 3 operatively connected to said set of brush heads 20 for moving the brush heads.

[0183] The handle 2 of the dental cleaning device 1 , shown in figures 1-4, is configured for being grabbed by a user, to ensure a firm and comfortable grip. The handle may extend along a length direction X by a predefined length, and along a width direction Y by a predefined width, wherein the width direction Y is orthogonal to the length direction X. The length of the handle may be greater than the width thereof. The length of the handle may be comprised between 100 mm and 170 mm. The width of the handle may be comprised between 20 mm and 55 mm. A cross section of the handle, along a cross plane orthogonal to a plane defined by the length direction and the width direction, may define an oblong shape. The handle 3 may be made of a plastic or metallic material.

[0184] The handle 2 may comprise an inner volume including a motor housing for receiving the motor 3. The motor 3 may be positioned and installed in said motor housing of the handle 2. The motor 3 of the dental cleaning device 1 is operatively connected to the set of brush heads 20 and configured to cause movement of the brush heads, e.g. a vibration of the brush heads 20. The motor 3 may be an electric motor, e.g. a brush or brushless electric motor. In detail, the motor may be configured to cause a first motion and a second motion of the set of brush heads 20.

[0185] The dental cleaning device 1 may comprise an activation button 5 configured to allow the user to activate the dental cleaning device 1. In particular, the activation button 5 is operatively connected to the motor 3 and configured to command, when pressed, activation of the motor and to command, when released, stop of the motor 3.

[0186] The inner volume of the handle 2 may also comprise a battery housing configured to receive a battery pack configured to electrically supply the motor 3. The battery pack may be rechargeable: the dental cleaning device 1 may comprise a supply socket, electrically connected to the battery pack, and configured to receive an electrical plug configured to supply electric energy to the battery pack to recharge it.

[0187] The set of brush heads 20 are carried by the mouthpiece 10 and configured for cleaning, during a use condition of said dental cleaning device 1 , the user’s teeth. The brush heads 20 include a number of movable bristles configured for contacting user’s teeth during a use condition of the dental cleaning device. The set of brush heads 20 may include a front module 30 configured to clean at least the user's incisor teeth during a use condition of the dental cleaning device. In other terms the front module 30, when inserted into the user’s mouth, contacts at least the incisor teeth of the user. Furthermore, the front module 30, when inserted into the user’s mouth, may contact also canine teeth of the user.

[0188] The front module 30 may be movable by a first motion: the first motion may include a translation motion, or a rotational motion around a front module axis external to the front module 30, or a roto-translation motion.

[0189] The first motion defines an alternating motion, either a translation alternating motion or a rotational alternating motion or a roto-translating alternating motion. The front module 30 is movable according to the first motion back and forth in an alternating manner during a use condition of the dental cleaning device at a predefined first motion frequency. The first motion frequency may be comprised between 16 Hz and 34 Hz. De facto, the first motion may define a vibration motion. The stroke of the front module 30 during the alternating motion may be comprised between 0,5 mm and 5 mm, optionally between 1 mm and 4 mm, more optionally between 1 ,5 mm and 3 mm.

[0190] In case the first motion includes a rotational motion, the correspondent front module axis of the front module is out of the front module 30: de facto, the front module axis does not cross the front module. In detail, the front module may be movable by rotation around the front module axis defining a radius having a length comprised between 5 cm and 200 cm, optionally between 50 cm and 200 cm.

[0191] On the contrary, if the first motion includes the translation motion, the front module 30 is movable back and forth along a straight direction, e.g. parallel to the width direction Y.

[0192] The front module 30 includes a bottom wall 33, a first lateral wall 31 and a second lateral wall 32 facing the first lateral wall 31 , wherein the bottom wall 33 is interposed in connection between the first lateral wall 31 and the second lateral wall 32. The first lateral wall 31 and the second lateral wall 32 extend transversal, and optionally orthogonally, to the mouthpiece virtual plane VP defining a front module channel in between. In particular, the first lateral wall 31 of the front module 30 may be parallel to the second lateral wall 32 of the front module 30. Analogously, the bottom wall 33 of the front module 30 may be orthogonal to the first lateral wall 31 and the second lateral wall 32 of the front module 30.

[0193] The front module channel is bounded by the first lateral wall 31 , the second lateral wall 32 and the bottom wall 33. The front module channel is configured for receiving at least incisor teeth of the user, optionally for receiving incisors and canines of the user. The first lateral wall 31 and the second lateral wall 32 may be spaced each other by a distance comprised between 6 mm and 15 mm, in particular between 7 mm and 10 mm. The first lateral wall 31 of the front module 30 may be external to the arcuate profile of the mouthpiece 10, while the second lateral wall 32 of the front module 30 may be internal to the arcuate profile of the mouthpiece 10.

[0194] The front module 30 may extend along a curvilinear or semi-circular path parallel to the mouthpiece virtual plane VP (the mouthpiece virtual plane VP is defined after in the description). The path may angularly extend by an angle comprised between 90° and 180°, in particular between 100° and 135°. Notably, the first lateral wall 31 and the second lateral wall 32 of the front module 30 may be concentric to each other.

[0195] The front module 30 may comprise bristles 35 arranged in the front module channel. In particular, the bristles 35 of the front module 30 may extend along a direction parallel to the mouthpiece virtual plane VP. The bristles 35 of the front module 30 may include a first set 35a of bristles and a second set 35b of bristles, wherein the first set 35a of bristles are attached to the first lateral wall 31 , and the second set 35b of bristles are attached to the second lateral wall 32. The first set 35a of bristles and the second set 35b of bristles may be substantially parallel to each other and face each other. Notably, the first set 35a of bristles may be spaced from the second set 35b of bristles by a distance comprised between 1 mm and 4 mm.

[0196] The first set 35a of bristles may extend up to a first height measured from the bottom wall 33 of the front module 30, and the second set 35b of bristles may extend up to a second height measured from the bottom wall of the front module 30: the first height may be greater than the second height: in particular, the first height may be greater than the second height by at least 1 mm or 2 mm. Notably, the first height and second height are measured orthogonally to the mouthpiece virtual plane VP, namely along the height extension of the lateral walls.

[0197] In an embodiment not shown in the attached figures, the bristles 35 of the front module 30 may extend along a direction which is transversal to the mouthpiece virtual plane VP. The bristles 35 of the front module 30 may extend from the first lateral wall 31 and / or the second lateral wall 32 transversal to the mouthpiece virtual plane VP away from the bottom wall 33 of the front module 30. In particular, the bristles 35 of the front module 30 may deviate from parallelism with the mouthpiece virtual plane VP by a front bristle angle comprised between 5° and 50°, in particular between 15° and 45°, more in particular between 25° and 45°, more in particular between 35° and 45°.

[0198] In an embodiment, the bristles 35 of the front module 30 attached to the first lateral wall 31 may deviate from parallelism with the mouthpiece virtual plane VP by a first front bristle angle, while the bristles 35 of the front module 30 attached to the second lateral wall 32 may deviate from parallelism with the mouthpiece virtual plane VP by a second front bristle angle, wherein the first front bristle angle is different from the second front bristle angle. In other terms, the bristles 35 attached to the first and the second lateral walls 31 , 32 may be tilted by different angles. In a specific embodiment, the bristles 35 of the front module 30 attached to the first lateral wall 31 may deviate from parallelism with the mouthpiece virtual plane VP by a front bristle angle comprised between 5° and 50°, in particular between 15° and 45°, more in particular between 25° and 45°, more in particular between 35° and 45°, while the bristles 35 of the front module 30 attached to the second lateral wall 32 may be parallel to the mouthpiece virtual plane VP.

[0199] The first and second lateral walls 31 , 32 of the front module 30 may have “C” or “II” shape. In more detail, a section of the front module 30 along a plane orthogonal to the mouthpiece virtual plane may define a “C” or “II” profile.

[0200] As shown in detail in figures 16 and 17, the bottom wall 33 of the front module 30 may be free of bristles, namely wherein the bottom wall 33 of the front module 30 does not carry bristles.

[0201] The set of brush heads 20 may further include at least a couple of back modules 40 configured to clean the user's posterior teeth, wherein the posterior teeth include at least one between a molar and / or premolar teeth. In particular, the molar teeth may include the first molar, the second molar and optionally the third molar of the patient, on the left and right side of the patient’s mouth.

[0202] The front module 30 may comprise a first front module and a second front module distinct and separated to each other. The first front module and the second front module may be both movable according to the first motion simultaneously. In more detail, the first front module and the second front module may be both movable according to the first motion simultaneously and in the same direction. Alternatively, the first front module and the second front module may be both movable according to the first motion simultaneously in opposite directions, so that when the first front module moves towards a left branch 12 of the mouthpiece 10 according to the first motion, the second front module moves towards a right branch 13 of the mouthpiece 10, and vice versa.

[0203] The first front module may be arranged closer to the left branch 12 than to the right branch 13 of the mouthpiece 10, while the second front module may be arranged closer to the right branch 13 than to the right branch 12 of the mouthpiece 10. According to an embodiment, the first front module and the second front module may be symmetric with respect to the length direction X of the dental cleaning device. Alternatively, the first module may be different in shape and / or dimensions with respect to the second front module.

[0204] Each of the back modules 40 are movable by a second motion including a rotational motion around a respective back module rotation axis R passing through the respective back module. In other terms, each back module 40 is movable by rotation around a respective back module rotation axis R which crosses the back module itself. Thus, each back module includes its own back module rotation axis R. Each back module rotation axis R is fixed in position with respect to the mouthpiece 10 and / or the handle 2.

[0205] The second motion defines an alternating motion around the back module rotation axis R of the respective back module. Each of the back modules 40 is movable by the second motion alternating clockwise and counter-clockwise movement, during the use condition of said dental cleaning device, at a predefined second motion frequency. The second motion frequency may be equal to the first motion frequency. The second motion frequency may be comprised between 16 Hz and 34 Hz. De facto, the second motion defines a vibration motion. Notably, the first motion of the front module 30 is simultaneous to the second motion of the back modules 40. In other terms, the front module 30 is configured to move according to the first motion simultaneously to the second motion of the back modules 40.

[0206] Each of the back modules 40 includes a bottom wall 43, a first lateral wall 41 and a second lateral wall 42 facing the first lateral wall 41 , wherein the bottom wall 43 is interposed in connection between the first lateral wall 41 and the second lateral wall 42. The first lateral wall 41 and the second lateral wall 42 of the back modules 40 may extend transversal to the mouthpiece virtual plane VP. The bottom wall 43 of the back modules 40 ma extend parallel to the mouthpiece virtual plane VP. In particular, the first lateral wall 41 and the second lateral wall 42 may be orthogonal to the bottom wall 43.

[0207] The first lateral wall 41 and the second lateral wall 42 of the back modules 40 may be spaced to each other by a distance comprised between 15 mm and 40 mm, optionally between 20 mm and 30 mm, more optionally between 24 mm and 26 mm.

[0208] Each of the back modules 40 is configured for receiving at least molar teeth and optionally also premolars between the first lateral wall 41 and second lateral wall 42 of the back module 40. The first lateral wall 41 of each back module 40 faces externally to the arcuate profile of the mouthpiece 10, while the second lateral wall 42 faces internally to the arcuate profile of the mouthpiece 10. Notably, the first lateral wall 41 may extend in height up to a level higher than the second lateral wall 42 of the back modules 40.

[0209] The back modules 40 may be “C” or “II” shaped. In particular, a section of each back module along a plane, parallel and coincident to the respective back module rotation axis R and orthogonal to the first and / or second lateral walls 41 , 42 of the back module, defines a “C” or “U” profile.

[0210] Each back module 40 may be made in single piece by plastic material.

[0211] The back modules 40 comprise also bristles 45. The bristles 45 may be attached to both the first lateral wall 41 and the second lateral wall 42 of the back modules 40. According to the embodiment shown in the attached figures, the bristles 45 may be attached to the first lateral wall 41 , the second lateral wall 42, and the bottom wall 43 of the back modules 40. The bristles 45 of the back modules 40 emerging from the first lateral wall 41 and the second lateral wall 42 may extend along a direction parallel to the mouthpiece virtual plane VP. De facto, the bristles 45 of the back modules 40 emerging from the first lateral wall 41 may be parallel to the bristles 45 of the back modules 40 emerging from the second lateral wall 42. The bristles 45 of the back modules 40 attached to the bottom wall 43 may extend along a direction orthogonal to the mouthpiece virtual plane VP. Thus, the bristles 45 of the back modules 40 attached to the bottom wall 43 may extend orthogonally to the bristles 45 emerging from the first lateral wall 41 and the second lateral wall 42 of the back modules 40.

[0212] The back module rotation axis R of each back module 40 crosses the bristles 45 of the back modules 40 attached to the bottom wall 43. The bristles 45 of the back modules 40 attached to the bottom wall 43 may also be positioned around the back module rotation axis R of the respective back module 40.

[0213] In detail, the bristles 45 of each back module 40 include a first set 45a of bristles attached to the first lateral wall 41 , and a second set 45b of bristles attached to the second lateral wall 42. The first set 45a of bristles and the second set 45b of bristles of the back module 40 are substantially parallel to each other. Furthermore, the first set 45a of bristles of the back module is spaced from the second set 45b of bristles of the same back module 40 by a distance comprised between 1 mm and 4 mm. The back module rotation axis R of each back module may not cross the first set 45a of bristles of the back module 40 and the second set 45b of bristles of the back module 40.

[0214] Each back module may include a bottom set 45c of bristles attached to the bottom wall 43 of the back module: the bottom set 45c of bristles extends along a direction parallel to the respective back module rotation axis R. The bottom set 45c of bristles extends along a direction orthogonal to the extension direction of the first set 45a and second set 45b of bristles of the back module.

[0215] Notably, the first set 45a of bristles may extend up to a first height measured from the bottom wall 43 of the back module, and the second set 45b of bristles may extend up to a second height measured from the bottom wall 43 of the back module: the first height may be greater than the second height, in particular wherein the first height is greater than the second height by at least 1 mm or 2 mm. This first height and second height are measured orthogonally to the mouthpiece virtual plane.

[0216] The bottom set 45c of bristles of the back modules 40 may extend in height between a bottom end, attached to the bottom wall, and a free portion: the free portion may have a wedge shape, wherein a maximum height of the free portion of the bottom set of bristles is at a central portion thereof.

[0217] In an embodiment not shown in the attached figures, said bristles 45 of the back modules 40 may extend along a direction which is transversal to the mouthpiece virtual plane VP. The bristles 45 of the back modules 40 may extend from the first lateral wall 41 and / or the second lateral wall 42 transversal to the mouthpiece virtual plane VP away from the bottom wall 43 of the back module 40. In detail, the bristles 45 of the back modules 40 may deviate from parallelism with the mouthpiece virtual plane VP by a back bristle angle comprised between 5° and 50°, in particular between 15° and 45°, more in particular between 25° and 45°, more in particular between 35° and 45°.

[0218] According to an embodiment, the bristles 45 of the back modules 40 attached to the first lateral wall 41 may deviate from parallelism with the mouthpiece virtual plane VP by a first back bristle angle, and the bristles 45 of the back module 40 attached to the second lateral wall 42 deviate from parallelism with the mouthpiece virtual plane VP by a second back bristle angle, wherein the first back bristle angle is different from the second back bristle angle. According to a specific embodiment, the bristles 45 a back module 40, optionally the bristles 45 of all the back modules, attached to the first lateral wall 41 may deviate from parallelism with the mouthpiece virtual plane VP by a back bristle angle comprised between 5° and 50°, in particular between 15° and 45°, more in particular between 25° and 45°, more in particular between 35° and 45°, and the bristles 45 of the same back module 40 attached to the second lateral wall 42 may be parallel to the mouthpiece virtual plane VP.

[0219] The back modules 40 are coupled to the mouthpiece 10 by a removable joint 44: for example, the removable joint may include an interlock. The mouthpiece 10 may include coupling pins 14 coupling or configured to couple a coupling portion 44a of the back modules 40. The coupling pins 14 may emerge in height orthogonally to the mouthpiece virtual plane VP. De facto, the removable joint 44 includes the coupling pins 14 of the mouthpiece and the coupling portion 44a of the back modules 40.

[0220] The back modules 40 may comprise a left back module 40L arranged on a left branch 12 of the mouthpiece, and a right back module 40R arranged on a right branch 13 of the mouthpiece 10. The transmission system is configured to move, according to the second motion, the left back module 40L and the right back module 40R simultaneously and in the same direction. De facto, during a use condition of the dental cleaning device, when the left back module 40L rotates clockwise, the right back module 40R rotates clockwise as well. Analogously, when the left back module 40L rotates counter-clockwise, the right back module 40R rotates counter-clockwise.

[0221] The left back module 40L may include a first left back module, a second left back module, and a third left back module. Analogously, the right back module 40R may include a first right back module, a second right back module, and a third right back module. Preferably, the number of left back modules is equal to the number of right back modules. Notably, the left back module 40L may include a fourth left back module configured to contact a left wisdom tooth of the user. The left wisdom tooth defines a third left molar of the user. Analogously, the right back module 40R may include a fourth right back module configured to contact a right wisdom tooth of the user. The right wisdom tooth defines a third right molar of the user.

[0222] Notably, the number of the left back modules may be different from the number of the right back modules. For example, the back modules may include a single left back module and two, three or four right back modules, defining an asymmetric configuration of the back modules.

[0223] Notably, the back module rotation axes R of the back modules 40 are parallel each other. In more detail, the back module rotation axis R of the left back module 40L is parallel to the back module rotation axis of the right back module 40R. Still in more detail, the back module rotation axis of the first left back module and the back module rotation axis of the second left back module are parallel to each other, and the back module rotation axis of the first right back module and the back module rotation axis of the second right back module are parallel to each other.

[0224] The mouthpiece 10 of the dental cleaning device 1 is connected or connectable to the handle 2 and configured for being inserted into the user’s mouth. The mouthpiece may be coupled to an end of the handle 2 and fixed with respect to the handle 2.

[0225] The mouthpiece 10 may define an arcuate profile comprising a front portion 11 , a left branch 12, and a right branch 13. De facto, the mouthpiece may have a horseshoe shape. In particular, the arcuate profile may be “C” or “II” shaped. The front portion 11 is interposed, along the arcuate profile, in connection between the left branch 12 and the right branch 13. The left branch 12 and the right branch 13 are spaced each other along the width direction Y, while the length direction X crosses the front portion 11 of the mouthpiece 10 orthogonally. In detail, the left branch 12 extends between a first portion attached to the front portion 11 and a second free end, while the right branch 13 extends between a respective first portion attached to the front portion 11 and a respective second free end: the second free end of the left branch 12 is spaced from the second free end of the right branch 13.

[0226] The front module 30 is located substantially at the front portion 11 , while the left branch 12 and the right branch 13 carry the back modules 40. In detail, the left branch 12 carries, or is configured to carry, the left back module 40L of the back modules 40, while the right branch 13 carries, or is configured to carry, the right back module 40R of the back modules 40.

[0227] The front module 30 is movable with respect to the front portion 11 of the arcuate profile of the mouthpiece 10 approaching and departing from the left branch 12 and the right branch 13 of the mouthpiece 10. Notably, if the front module is movable by rotation around the front module axis, the front module axis is interposed between the left branch 12 and the right branch 13 of the mouthpiece 10. In particular, the front module axis may be equidistant from the left branch and the right branch of the mouthpiece 10. The front module axis may be positioned on a symmetry line of the mouthpiece 10: the symmetry line may be coincident and parallel to the length direction X of the dental cleaning device.

[0228] The mouthpiece 10, and namely the front portion 11 , the left branch 12, and the right branch 13, defines a single body. In particular, the mouthpiece 10, and namely the front portion 11 , the left branch 12, and the right branch 13, is made as a single piece. The mouthpiece 10 may be made of plastic material.

[0229] A single mouthpiece virtual plane VP, shown in figure 1 , passes through the front portion 11 , the left branch 12 and the right branch 13 of the mouthpiece 10. Thus, the mouthpiece virtual plane VP is parallel and coincident to the arcuate profile of the mouthpiece 10 and separates an upper side from a lower side of the mouthpiece 10. The front module 30 and the back modules 40 are arranged on one between the lower side and the upper side. For example, the front module 30 and the back modules 40 may be both arranged on the lower side, while the upper side is free of front module and back modules.

[0230] The mouthpiece 10 may include a groove guide 15 defining a channel extending along the front portion 11 , the left branch 12 and the right branch 13 of the mouthpiece 10. The groove guide 15 defines an arcuate profile: in particular, the groove guide 15 may follow the same arcuate profile of the mouthpiece 10. De facto, the groove guide 15 defines a channel carved into the mouthpiece.

[0231] The groove guide 15 may comprise a rear wall 15c, a first side wall 15a and a second side wall 15b, wherein the first side wall 15a faces the second side wall 15b, and wherein the rear wall 15c is interposed in connection between the first side wall 15a and the second side wall 15b. The first side wall 15a and the second side wall 15b may be plane and parallel to each other. The rear wall 15c may be plane and orthogonal to the first side wall 15a and / or the second side wall 15b. The first side wall 15a may be spaced from the second side wall 15b by a distance comprised between 1 mm and 7 mm, in particular between 2 mm and 5 mm.

[0232] The transmission system may include a motion-transfer rod 50 operatively connected to the motor 3 and configured for moving alternately forward and backward according to a predefine movement frequency. This movement frequency may be equal to the first motion frequency of the front module and the second motion frequency of the back modules. De facto, the motion-transfer rod 50 vibrates to cause the first motion and the second motion. The motion-transfer rod 50 may extend along the arcuate profile of the mouthpiece 10 and includes a left tract 52 carried by the left branch 12 of the mouthpiece 10 and extending along the left branch 12, and a right tract 53 carried by the right branch 13 of the mouthpiece 10 and extending along the right branch 13. The motion-transfer rod 50 further include a front tract 51 , located at the front portion 11 of the mouthpiece 10, interposed in connection between the right tract 53 and the left tract 52 of the motion-transfer rod 50. The motiontransfer rod 50 is configured to move the front module 30 according to the first motion, and to move the back modules 40 according to the second motion. De facto, the motion-transfer rod 50 acts as a kinematic link between the front module and the back modules. Notably, the motion-transfer rod 50 vibrates to cause the first motion and the second motion.

[0233] The motion-transfer rod 50 may be in one piece, in particular wherein the left tract, right tract and front tract of the motion-transfer rod 50 are in one piece. In particular, the motiontransfer rod 50 may be made of plastic material.

[0234] The motion-transfer rod 50 is arranged at least partially within the groove guide 15 of the mouthpiece, so that the motion-transfer rod 50 is able to slide with respect to the mouthpiece 10 within the groove guide 15, to cause the first motion of the front module 30, and to cause the second motion of the back modules 40. The motion-transfer rod 50 is located between the first side wall 15a and the second side wall 15b of the groove guide 15: the motiontransfer rod 50 has a width, measured along a direction crossing the first side wall 15a and the second side wall 15b, so that a clearance is provided between the motion-transfer rod 50 and the first side wall 15a and / or the second side wall 15b. This clearance may be comprised between 0,2 mm and 0,8 mm, in particular between 0,35 mm and 0,65 mm. Notably this clearance may be calculated as a difference between a distance between the first side wall 15a and the second side wall 15b, and said width of the motion-transfer rod 50.

[0235] Notably, the motion-transfer rod 50 may include two or more protrusions 56, optionally three or four or more protrusions 56, extending towards the first side wall 15a and the second side wall 15b of the groove guide 15. These protrusions 56 are configured to slide over the first side wall 15a and the second side wall 15b of the groove guide 15. The protrusions 56 may have rounded shape to make sliding of the motion-transfer rod 50 smoother. A clearance is provided between these protrusions and the first side wall 15a and the second side wall 15b of the groove guide 15 to allow movement of the motion-transfer rod 50 within the groove guide 15. The protrusions 56 may be arranged at the left tract 52 and the right tract 53 of the motion-transfer rod 50.

[0236] The motion-transfer rod 50 is configured to flex while moving within the groove guide 15 with respect to the mouthpiece 10, to follow a trajectory of the channel defined by the groove guide 15. The motion-transfer rod 50 is thus flexible around an axis orthogonal to the mouthpiece virtual plane VP: this axis may be variable in position along the motion-transfer rod 50. De facto the motion-transfer rod 50 is configured to flex, and in particular to bend, to transfer an input motion from the motor 3 to the front module 30, to cause the first motion of the front module 30, and to the back modules 40 to cause the second motion of the back modules 40.

[0237] The motion-transfer rod 50 is operatively connected to the front module 30 and the back modules 40 to determine respectively the first motion and the second motion.

[0238] The front module 30 is fixed to the front tract 51 of the motion-transfer rod 50: thus, the front tract 51 of the motion-transfer rod 50 is movable along the first motion. The right tract 53 of the motion-transfer rod 50 is movable along a first direction, which may be a straight direction, transversal to the first motion. Analogously, the left tract 52 of the motion-transfer rod 50 is movable along a second direction, which may be a straight direction, transversal to the first motion.

[0239] The motion-transfer rod 50 may be operatively connected to the back modules 40 through a kinematic joint 55. The kinematic joint 55 is configured to convert a motion of the motiontransfer rod 50 to the second motion of the back modules 40. In more detail, each of the back modules 40 includes a respective peripheric portion 47 having a recess 46, and the motion-transfer rod 50 includes kinematic pins 54 configured to interact with the recess 46 of the peripheric portion 47 of each back module 40. The recess 46 of the back modules and the kinematic pins 54 of the motion-transfer rod 50 define in combination the kinematic joint 55. Notably the recess 46 of the peripheric portion 47 of the back modules 40 is space from the rotation axis R of the back module.

[0240] Each kinematic pin 54 is received in the recess 46 of the respective back module 40, so that the movement of the motion-transfer rod 50 is transferred to the back module, causing the second motion. The kinematic pins 54 of the motion-transfer rod 50 are positioned on the right tract 53 and the left tract 52 of the motion-transfer rod 50.

[0241] The kinematic pins 54 emerge from the motion-transfer rod 50 towards the back modules 40, in particular towards the lower side of the mouthpiece 10. The kinematic pins 54 emerge in height from the motion-transfer rod 50 along a direction orthogonal to a movement direction of the motion-transfer rod 50, in particular orthogonally to the mouthpiece virtual plane. The kinematic pins 54 of the motion-transfer rod 50 emerge out of the groove guide 15. Notably, the kinematic pins 54 are equal in number to the number of the back modules 40.

[0242] According to an alternative embodiment shown in figure 18, the kinematic pins 54 may emerge from the motion-transfer rod 50 along a direction parallel to the mouthpiece virtual plane VP. The kinematic pins 54 may emerge inwards the arcuate profile of the mouthpiece 10, towards the recess 46 of the peripheric portion 47 of the back modules. The kinematic pins 54 may be lobe-shaped to smoothly transfer the motion from the motion-transfer rod 50 to the back modules. In more detail, the kinematic pins 54 may extend between a first end attached to the motion-transfer rod 50 and a second free end, wherein the second free is rounded. Notably the second free end is configured to enter the recess 46 of the respective peripheric portion 47 of the back modules 40.

[0243] The front tract 51 of the motion-transfer rod 50 includes a guide channel 57, and the mouthpiece 10 includes a mouthpiece rail 17 protruding into the guide channel 57 of the motion-transfer rod 50: the motion-transfer rod 50 is configured to slide over the mouthpiece 10 along the mouthpiece rail 17. The mouthpiece rail 17 may extend along a rectilinear path, or a curvilinear path or a semi-circular path. If the mouthpiece rail 17 extends along the rectilinear path, the first motion of the front module 30 is a rectilinear translation motion. If the mouthpiece rail extends along the curvilinear path, the first motion of the front module 30 includes the rotational or roto-translation motion. If the mouthpiece 10 rail extends along the semi-circular path, the first motion of the front module 30 includes the rotational motion. The motor 3 is kinematically connected to the brush heads 20 by a rod-crank kinematic system 60, so that the brush heads are allowed to move according to the first and second motion. In particular, the motor 3 is kinematically connected to the motion-transfer rod 50 by the rod-crank kinematic system 60, which is shown schematically in figure 13. The motor 3 has an output shaft 3a configured to rotated around a motor axis when the motor is activated, namely when the motor 3 is electrically supplied: the motor 3 is configured to move the rod-crank kinematic system 60.

[0244] The rod-crank kinematic system includes a crank 61 movable by rotation around a respective crank axis, and a connecting rod 62 connected to the crank 61 . A rotation of the crank around the crank axis determines an alternating movement of the connecting rod 62. In detail, the crank includes a crank pin journal 61a, spaced from the crank axis, connected to a first end 62a of the connecting rod 62. A second end 62b of the connecting rod 62 is connected to a linking portion 58 the motion-transfer rod 50. The linking portion 58 of the motion-transfer rod 50 is positioned close to the front tract 51 of the motion-transfer rod 50. Thus, the linking portion 58 of the motion-transfer rod 50, and therefore also the front tract 51 of the motion-transfer rod 50, moves in an alternating manner back and forth as linked to the second end 62b of the connecting rod 62.

[0245] The motor 3 may be connected to the crank 61 through a gear reduction system 70 including a first gear 71 , fitted on the output shaft 3a of the motor 3, and a second gear 72 carrying the crank 61 , wherein the first gear 71 and the second gear 72 engage with each other to define gear reduction system 70. In detail, the first gear 71 is smaller in diameter than the second gear 72, so that the angular speed of the first gear 71 is higher than the angular speed of the second gear 72 when the motor 3 is running.

[0246] Customization

[0247] The dental cleaning device 1 may customizable based on a measurement process of the user’s dental arch. For example, the dental cleaning device 1 may be customizable relative to the number and / or size of back modules installed on the mouthpiece 10. More in detail, the dental cleaning device 1 may be customizable relative to the number of back modules installed on the left branch and the right branch 13 of the mouthpiece 10. The back modules installed on the left branch 12 may be in a different number than the back modules installed on the left branch 14, or in the same number as the back modules installed on the left branch 14.

[0248] Thus, a manufacturing process of a dental cleaning device 1 previously described may be performed for customizing the dental cleaning device based on the needs of the user.

[0249] The manufacturing process includes a step of scanning the user’s dental arch, e.g. by using 3D scanner which provides 3D data representative of the user’s dental arch. The 3D data may include a 3D image of the user’s dental arch.

[0250] The manufacturing process further includes a step of determining a construction configuration of the dental cleaning device 1 based on data provided by the scanning step. The construction configuration may comprise a specific number of the back modules 40, a front size of the front module 30 and a back size of the back modules 40.

[0251] Furthermore, the construction configuration may include a specific number of the back modules 40 arranged on the left branch 12 of the mouthpiece 10, and a specific number of the back modules 40 arranged on the right branch 12 of the mouthpiece 10.

[0252] The construction configuration may further include a size of the back modules 40 arranged on the left branch 12 of the mouthpiece 10, and a size of the back modules 40 arranged on the right branch 13 of the mouthpiece 10.

[0253] The construction configuration may further include a size of the first left back module arranged on the left branch 12 of the mouthpiece 10, and a size of the second left back module arranged on the left branch 12 of the mouthpiece 10.

[0254] The construction configuration may further include a size of the first right back module arranged on the right branch 13 of the mouthpiece 10, and a size of the second right back module arranged on the right branch 13 of the mouthpiece 10.

[0255] The construction configuration may further include an angular orientation, with respect to the mouthpiece virtual plane VP, of the bristles 45 of the back modules 40.

[0256] The construction configuration may further include an angular orientation, with respect to the mouthpiece virtual plane VP, of the bristles 35 of the front modules 40.

[0257] The manufacturing process eventually includes a step of assembling the dental cleaning device 1 according to the determined construction configuration.

[0258] Dental cleaning device 1000 - Second embodiment

[0259] Reference number 1000 is directed to a dental cleaning device according to a second embodiment, shown in the attached figures 19-30, for oral hygiene of a user. The dental cleaning device 1000 may be an electric toothbrush. In generic terms, the dental cleaning device 100 may comprise a handle 2, a mouthpiece 100, sets of brush heads 200, and a motor operatively connected to said set of brush heads 200 for moving the brush heads.

[0260] The handle 2 of the dental cleaning device 1000, shown in figures 19-21 , is configured for being grabbed by a user, to ensure a firm and comfortable grip. The handle may extend along a length direction X by a predefined length, and along a width direction Y by a predefined width, wherein the width direction Y is orthogonal to the length direction X. The length of the handle may be greater than the width thereof. The length of the handle may be comprised between 100 mm and 170 mm. The width of the handle may be comprised between 20 mm and 55 mm. A cross section of the handle, along a cross plane orthogonal to a plane defined by the length direction and the width direction, may define an oblong shape. The handle may be made of a plastic or metallic material.

[0261] The handle 2 may comprise an inner volume including a motor housing for receiving the motor. The motor may be positioned and installed in the motor housing of the handle 2. The motor of the dental cleaning device 1000 is operatively connected to the set of brush heads 200 and configured to cause movement of the brush heads, e.g. a vibration of the brush heads 200. The motor may be an electric motor, e.g. a brush or brushless electric motor.

[0262] The dental cleaning device 1000 may comprise an activation button 5 configured to allow the user to activate the dental cleaning device 1. In particular, the activation button 5 is operatively connected to the motor and configured to command, when pressed, activation of the motor, and to command, when released, stop of the motor.

[0263] The inner volume of the handle 2 may also comprise a battery housing configured to receive a battery pack configured to electrically supply the motor. The battery pack may be rechargeable: the dental cleaning device 1000 may comprise a supply socket, electrically connected to the battery pack, and configured to receive an electrical plug configured to supply electric energy to the battery pack to recharge it.

[0264] The handle 2 further comprises a drive pin 2a of the handle 2 operatively connected to the motor: the drive pin 2a, shown in figure 21 , is configured to move laterally in a vibration movement driven by the motor. The vibration movement of the drive pin 2a of the handle is a translational movement having the same frequency of a vibration motion of the at least one motion-transfer rod 500 (described here after). Notably, the translational movement of the drive pin may be parallel to a plane (the virtual mouthpiece plane) comprising the arcuate profile of the mouthpiece 100: in fact, the translational movement of the pin 2a may be purely translational. The motor is kinematically connected to the drive pin 2a by a rodcrank kinematic system 60, which may be according to the description already provided for the first embodiment: therefore, the rod-crank kinematic system 60, shown in figure 13, may also apply to the second embodiment of the device 1000. In particular, the motor is kinematically connected to the drive pin 2a by the rod-crank kinematic system 60: the details shown in figure 13 may also apply to this second embodiment. The motor 3 has an output shaft 3a configured to rotate around a motor axis when the motor is activated, namely when the motor 3 is electrically supplied. The rod-crank kinematic system 60 includes a crank 61 movable by rotation around a respective crank axis, and a connecting rod 62 connected to the crank 61. A rotation of the crank around the crank axis determines an alternating movement of the connecting rod 62. The drive pin 2a may be connected to the rod 62, the latter causing the translational movement of the drive pin 2a.

[0265] The handle 2 is configured to be connected, in a removable manner, to the mouthpiece 100 shown in the figures 19, 20, 22, 23 and 30. The mouthpiece 100 is arch-shaped and has dimensions compatible with the user’s mouth: in fact, the mouthpiece 100 defines an arcuate profile having a left branch 120, a right branch 130 and a front portion 110 interposed in connection between the left branch 120 and the right branch 130. The front portion 110 and the right branch 130 of the mouthpiece 100 are consecutive to each other defining the arcuate profile of the mouthpiece 100 in a continuous manner. The mouthpiece 100 may be is symmetrical with respect to a plane of symmetry passing through the front portion 110: this plane of symmetry may be orthogonal to the plane comprising the arcuate profile of the mouthpiece 100, wherein the left branch 120 and the right branch 130 are equidistant from the plane of symmetry. Notably, the drive pin 2a may be positioned at the front portion 110 of the mouthpiece 100.

[0266] The mouthpiece 100 may include a groove guide 150, defining a channel, extending continuously along the arcuate profile of the mouthpiece 100, in particular along the front portion 110, the left branch 120 and the right branch 130 of the mouthpiece 100. The groove guide 150 defines an arcuate profile: in particular, the groove guide 150 may follow the same arcuate profile of the mouthpiece 100. De facto, the groove guide 15 defines a channel carved into the mouthpiece.

[0267] The groove guide 150 may comprise a rear wall 150c, a first side wall 150a and a second side wall 150b, wherein the first side wall 150a faces the second side wall 150b, and wherein the rear wall 150c is interposed in connection between the first side wall 150a and the second side wall 150b. The first side wall 150a and the second side wall 150b may be plane and parallel to each other. The rear wall 150c may be plane and orthogonal to the first side wall 150a and / or the second side wall 150b. The first side wall 150a may be spaced from the second side wall 150b by a distance comprised between 1 mm and 7 mm, in particular between 2 mm and 5 mm.

[0268] The mouthpiece may further comprise an end aperture 121 positioned at the end of the left branch 120 and an end aperture 131 positioned at the right branch 130: the end apertures 121 and 131 extend substantially orthogonal to the plane comprising the arcuate profile of the mouthpiece, namely to the mouthpiece virtual plane VP. The end apertures 121 , 131 may have a closed contour. The closed contour may have polygonal shape, for example rectangular or square shape, circular shape, or ovoidal shape.

[0269] The mouthpiece 100 may be made in one piece, i.e. wherein the left branch 120, the right branch 130 and the front portion 110 are together in one piece.

[0270] The mouthpiece 100 may be made in polymeric material, such as plastic material.

[0271] The dental cleaning device 1000 includes sets of brush heads 200 positioned on the mouthpiece 100 and configured for cleaning, during a use condition of said dental cleaning device, the user’s teeth. The brush heads 200 may be arranged all along the arcuate profile of the mouthpiece, namely at the left branch 120, the right branch 130 and the front portion 110 of the mouthpiece 100. Each brush head 200 includes a respective supporting wall, i.e. a plate made of plastic material, and a number of bristles attached to this supporting wall extending away from the supporting wall. The supporting wall of each brush head is configured for coupling to the motion-transfer rod 500 described here after. In fact, each brush head is composed of a single supporting wall and a plurality of bristles attached to this supporting wall. Each supporting wall is substantially a flat tab, wherein the bristles are attached to one of the two faces of the tab.

[0272] The dental cleaning device 1000 includes a transmission system connecting kinematically the motor to the sets of brush heads 200. The transmission system includes at least one motion-transfer rod 500, shown in figures 22, 23 and 26-29, operatively connected to the motor and extending along the arcuate profile of the mouthpiece 100. The sets of brush heads 200 are fixed to the at least one motion-transfer rod 500, so that a movement of the motion-transfer rod 500 corresponds to the same movement of the brush heads 200. No kinematic components are interposed between the motion-transfer rod 500 and the brush heads 200.

[0273] The at least one motion-transfer rod 500 may extend in one piece along the arcuate profile of the mouthpiece 100, i.e. from the left branch 120 to the right branch 130, through the front portion 110 seamlessly.

[0274] The at least one motion-transfer rod 500 is movable along the mouthpiece 100, and with respect to the mouthpiece 100, according to a translational motion: the sets of brush heads 200 move together with the motion-transfer rod 500 according to the same translational motion. In particular the motion-transfer rod 500 may slide over the mouthpiece 100.

[0275] The motion-transfer rod 500 may be arranged within the groove guide 150: the motiontransfer rod 500 is configured to move, and in particular to slide, with respect to the mouthpiece 100 within the groove guide 150 according to a vibration motion to cause a respective vibration motion of the sets of brush heads 200. Notably, the rear wall 150c of the groove guide 150 extends along the arcuate profile of the mouthpiece, and the motion- transfer rod 500 extends continuously along the rear wall 150c, so that the motion-transfer rod 500 faces continuously the rear wall 150c of the groove guide 150. The motion-transfer rod 500 may contact the rear wall 150c of the groove guide. In fact, the motion-transfer rod 500 is in between the first side wall 150a and the second side wall 150b.

[0276] The motion transfer rod 500 comprises a continuous structural profile 550 following the arcuate profile of the mouthpiece 100 extending between the left branch 120 up to the right branch 130 in a continuous manner, to transmit the vibration motion to the set of brush heads. In fact, the continuous structural profile 550 facing the rear wall 150c of the groove guide 150 extends continuously, without interruption, from the left branch 120 to the right branch 130.

[0277] The continuous structural profile 550 may be positioned completely within the groove guide 150, facing the rear wall 150c of the groove guide 150. In fact, the first and second side walls 150a, 150b extend in height, orthogonally to the mouthpiece virtual plane, more than a respective height extension of the continuous structural profile 550. Thus, a motion plane of the motion-transfer rod 500 may comprise the continuous structural profile 550.

[0278] The at least one motion-transfer rod 500 is movable along the mouthpiece 100 back and forth around a middle position defining the vibration motion of the sets of brush heads 200. The vibration motion of the motion-transfer rod 500 has a respective frequency and amplitude around the middle position, wherein the frequency is comprised between 16 Hz and 34 Hz , and the amplitude is comprised between 0,7 mm and 3 mm, optionally between 1 ,5 mm and 2 mm, in particular 2 mm. The middle position is fixed.

[0279] The motion-transfer rod 500 may be configured to flex while moving within the groove guide 150 to follow the arcuate profile of the mouthpiece 100. De facto, the motion-transfer rod 500 may be configured to bend while moving along the mouthpiece 100 around an axis orthogonal to a mouthpiece virtual plane of the mouthpiece. The mouthpiece virtual plane comprises the arcuate profile of the mouthpiece and corresponds to the motion plane of the motion-transfer rod 500.

[0280] Accordingly, the motion-transfer rod 500 may be made of plastic material and in one piece. Notably, the motion-transfer rod 500 is able to transfer both compressive and tensile forces. In an embodiment not shown in the attached figures, the at least one motion-transfer rod 500 may comprise a single motion-transfer rod 500 extending along the arcuate profile of the mouthpiece 100. In this case, the single motion-transfer rod 500 is equidistant from the first side wall 150a and the second side wall 150b of the groove guide 150.

[0281] Alternatively the at least one motion-transfer rod 500 may comprise, as shown in figures 22, 23 and 26-29, a first motion-transfer rod 500a and a distinct second motion-transfer rod 500b both extending along the arcuate profile of the mouthpiece 100. The first motion- transfer rod 500a and the second motion-transfer rod 500b extend continuously along the front portion 110, the left branch 120 and the right branch 130 of the mouthpiece 100.

[0282] The second motion-transfer rod 500b may be positioned internally to the first motiontransfer rod 500a with respect to the arcuate profile of the mouthpiece 100. Therefore, the first motion-transfer rod 500a will be external to the second motion-transfer rod 500b. The first motion-transfer rod 500a and the second motion-transfer rod 500b are positioned side by side all along the arcuate profile of the mouthpiece 100. In fact, the first motion-transfer rod 500a and the second motion-transfer rod 500b are in contact to each other all along the arcuate profile of the mouthpiece 100. Both the first motion-transfer rod 500a and the second motion-transfer rod 500b copy the arcuate profile of the mouthpiece 100.

[0283] Each one of the first motion-transfer rod 500a and the second motion-transfer rod 500b may be made in one piece, in particular in plastic material. In particular, the first motion-transfer rod 500a and the second motion-transfer rod 500b may be made of the same material.

[0284] The first motion-transfer rod 500a may be engaged by a connection coupling 501 , shown in figures 26 and 27, to the second motion-transfer rod 500b at a mutual central region located substantially at the front portion 110 of the mouthpiece 100. In fact, the central region of the first and second motion-transfer rods 500a, 500b are equidistant from the left branch 120 and the right branch 130 of the mouthpiece. In detail, the plane of symmetry of the mouthpiece 100 may cross the central region of the first and second motion-transfer rods 500a, 500b. Notably, the first motion-transfer rod 500a may be engaged to the second motion-transfer rod 500b only at said mutual central region, wherein the first motion-transfer rod 500a at the left branch 120 and the right branch 130 is disengaged from the second motion-transfer rod 500b.

[0285] The connection coupling 501 is configured to transfer a vibration motion of the first motiontransfer rod 500a to the second motion-transfer rod 500b so that the first motion-transfer rod 500a and the second motion-transfer rod 500b are movable together according to the same vibration motion.

[0286] The connection coupling 501 may comprise at least one protrusion and at least one recess respectively arranged on the first motion-transfer rod 500a and on the second motiontransfer rod 500b or vice versa: the recess receives the protrusion defining the connection coupling 501. In particular, the protrusion extends parallel to the plane comprising the arcuate profile of the mouthpiece, so that, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are positioned within the groove guide 150, the connection coupling 501 prevents disengagement between the first motion-transfer rod 500a and the second motion-transfer rod 500b.

[0287] The at least one motion-transfer rod 500 may comprise a cavity 505, shown in figure 16, 27 and 31 , at the front portion of the mouthpiece 100, and facing opposite with respect to the arcuate profile of the mouthpiece 100. This cavity 505 is configured to receive the drive pin 2a of the handle 2 operatively connected to the motor. It is worth noting that the cavity 505 has a size compatible with, in fact substantially equal to, the size of the drive pin 2a to allow the drive pin 2a to transfer the vibration motion to the motion-transfer rod 500.

[0288] When the device comprises the first and second motion-transfer rods 500a, 500b, the cavity 505 is carved out of the first motion-transfer rod 500a. Optionally, the cavity 505 may be carved out of the first and second motion-transfer rods 500a, 500b: in this case, the drive pin 2a extends, through the first motion-transfer rod 500a, up to the second motion-transfer rod 500b.

[0289] The motion-transfer rod 500, for example a single motion-transfer rod 500 or the first and second motion-transfer rods 500a, 500b, may comprise at least one lateral wall 502 extending in height transversal to a motion plane of the at least one motion-transfer rod 500: the motion plane in fact corresponds to the virtual mouthpiece plane comprising the arcuate profile of the mouthpiece. The lateral wall 502 may be arranged at the left branch 120, the right branch 130 and the front portion 110 of the mouthpiece 100 and configured for being coupled to the supporting walls of the brush heads. The lateral wall 502 may have a thickness comprised between 0,5 mm and 2 mm, optionally between 0,9 mm and 1 ,8 mm. The at least one lateral wall 502 may comprise an external lateral wall 502a, external to the arcuate profile of the mouthpiece 100, and an internal lateral wall 502b internal to the arcuate profile of the mouthpiece 100.

[0290] When the device 1000 comprises the first motion-transfer rod 500a and the second motiontransfer rod 500b, the first motion-transfer rod 500a comprises the external lateral wall 502a arranged at one or more between the left branch 120, the right branch 130 and the front portion 110 of the mouthpiece 100. Analogously, the second motion-transfer rod 500b may comprise the internal lateral wall 502b arranged at one or more between the left branch 120, the right branch 130 and the front portion 110 of the mouthpiece 100. According to the attached figures, the external lateral wall 502a and the internal lateral wall 502b extend along the entire arcuate profile of the mouthpiece, namely from the right branch 130 up to the left branch 120 passing through the front portion 110.

[0291] The sets of brush heads 200 comprise at least an external set 200a of brush heads 200 for cleaning an external surface of the user’s teeth, and an internal set 200b of brush heads 200 for cleaning an internal surface of the user’s teeth. The external set 200a of brush heads 200 are positioned externally with respect to the arcuate profile of the mouthpiece 100, while the internal set 200b of brush heads 200 are positioned internally to the arcuate profile of the mouthpiece 100.

[0292] It is notable that the external set 200a of brush heads 200 and the internal set 200b of brush heads 200 are separated and independent to each other. In other terms, the supporting walls of the external set 200a of brush heads 200 are distinct from the supporting walls of the internal set 200b of brush heads 200. The external set 200a of brush heads 200 may be fixed only to the first motion-transfer rod 500a, and the internal set 200b of brush heads 200 may be fixed only to the second motion-transfer rod 500b. In particular, the supporting walls of the internal set 200b of brush heads 200 are fixed to the internal lateral wall 502b of the second motion-transfer rod 500b, while the supporting walls of the external set 200a of brush heads 200 are fixed to the external lateral wall 502a of the first motion-transfer rod 500a.

[0293] The presence of two distinct motion-transfer rods, i.e. the first motion-transfer rod 500a and the second motion-transfer rod 500a, combined with the fact that the external set 200a of brush heads 200 is engaged only to the first motion-transfer rod 500a and the internal set 200b of brush heads 200 is engaged only to the second motion-transfer rod 500b, allows each brush head to adapt to different tooth sizes. De facto, the internal brush heads 200b are independent from the external brush heads 200a, because the second motion-transfer rod 500b and the first motion-transfer rod 500b can deform, in particular twist, independently to each other. When the external brush heads 200a are pushed outwardly by a tooth and the internal brush heads 200b are pushed inwardly, the first motion-transfer rod 500a and the second motion-transfer rod 500b flex or twist independently to each other.

[0294] The lateral wall 502 of the motion transfer rod 500 comprises an outer surface facing outwardly the arcuate profile of the mouthpiece 100, and an inner surface facing inwardly the arcuate profile of the mouthpiece 100. Each brush head of the sets of brush heads are mountable at the outer surface and the inner surface of the lateral wall 502. The distance between the external brush heads 200a and the internal brush heads 200b can be adjusted simply by coupling the supporting walls of the brush heads to the outer surface or inner surface of the lateral wall 502. Figure 29 clearly shows some brush heads attached to the outer surface, and other brush heads attached to the inner surface of the lateral wall. It is worth noting that each brush head of the sets of brush heads may be coupled to the lateral wall 502 by ultrasonic welding or a biocompatible glue, wherein the latter may be a UV glue. The term UV glue refers to a glue configured to cross-link when exposed to ultraviolet light. Analogously, the external lateral wall 502a of the first motion-transfer rod 500a and the internal lateral wall 502b of the second motion-transfer rod 500b comprise respective outer surfaces facing outwardly the arcuate profile and inner surfaces facing inwardly the arcuate profile of the mouthpiece 100. Each brush head of the sets of brush heads are mountable at the outer surface and the inner surface of the external lateral wall 502a and of the internal lateral wall 502b. The distance between the external brush heads 200a and the internal brush heads 200b can be adjusted by coupling the supporting walls of the brush heads either to the outer surface or inner surface of the external / internal lateral walls 502a, 502b. The lateral wall 502 may comprise, as shown in figure 26, a left branch lateral wall 502L and a right branch lateral wall 502R respectively positioned at the left branch 120 and the right branch 130 of the mouthpiece 100. The left branch lateral wall 502L and right branch lateral wall 502R carry a posterior lateral set of brush heads 200d for cleaning the user’s posterior teeth, namely molar and / or a premolar teeth. In fact, the posterior lateral set of brush heads 200d are carried by the left and right lateral walls 502L, 502R of any one of the first and second motion-transfer rods 500a, 500b.

[0295] The left branch lateral wall 502L may be configured to carry two or more brush heads 200, namely two or more supporting walls, distinct to each other, of brush heads.

[0296] Analogously, the right branch lateral wall 502R may be configured to carry two or more brush heads 200, namely two or more supporting walls, distinct to each other, of brush heads.

[0297] The left branch lateral wall 502L and the right branch lateral wall 502R extend along a length extension and a height extension: the length extension is directed along the extension of the left branch 120 and the right branch 130 of the mouthpiece 100, while the height extension is transversal to the length extension away from the mouthpiece 100. De facto the height extension is directed transversal to the virtual mouthpiece plane comprising the arcuate profile of the mouthpiece 100. Notably, the length extension is greater than the height extension.

[0298] The height extension of the left branch lateral wall 502L and the right branch lateral wall 502R may decrease linearly approaching towards an end of the left branch 120 and the right branch 130.

[0299] The left branch lateral wall 502L and the right branch lateral wall 502R may extend respectively along the left branch 120 and the right branch 130 in a continuous manner, in particular defining a continuous surface. The left branch lateral wall 502L may comprise an internal left branch lateral wall positioned internally with respect to the arcuate profile of the mouthpiece 100, and an external left branch lateral wall positioned externally with respect to the arcuate profile of the mouthpiece 100: the external left branch lateral wall is fixed to, or is part of, the first motion-transfer rod 500a, while the internal left branch lateral wall is fixed to, or is being part of, the second motion-transfer rod 500b.

[0300] The right branch lateral wall 502R may analogously comprise an internal right branch lateral wall positioned internally with respect to the arcuate profile of the mouthpiece 100, and an external right branch lateral wall positioned externally with respect to the arcuate profile of the mouthpiece 100: the external right branch lateral wall is fixed to, or is part of, the first motion-transfer rod 500a, while the internal right branch lateral wall is fixed to, or is part of, the second motion-transfer rod 500b. An angle comprised between the external left branch lateral wall and the internal left branch lateral wall may be comprised between 30° and 90°, optionally between 40° and 70°. The external left branch lateral wall may deviate from orthogonality with the mouthpiece virtual plane by a first angle comprised between 45° and 15°. Analogously, the internal left branch lateral wall may deviate from orthogonality with the mouthpiece virtual plane by a second angle comprised between 45° and 15°.

[0301] The internal and external lateral walls at the left branch of the mouthpiece 100 may be specular to the internal and external lateral walls at the right branch of the mouthpiece 100. In fact, an angle comprised between the external right branch lateral wall and the internal right branch lateral wall may be comprised between 30° and 90°, optionally between 40° and 70°. The external right branch lateral wall may deviate from orthogonality with the mouthpiece virtual plane by a first angle comprised between 45° and 15°. Analogously, the internal right branch lateral wall may deviate from orthogonality with the mouthpiece virtual plane by a second angle comprised between 45° and 15°.

[0302] Notably, the features described above relating to the external right branch lateral wall, the internal right branch lateral wall, the external left branch lateral wall and the internal left branch lateral wall may also apply when the device 1000 comprises a single motion-transfer rod 500, instead of the first and second motion-transfer rods 500a, 500b.

[0303] Both the external and internal left / right branch lateral walls may have a height that decreases towards the end of the left branch 120 and the right branch 130. In fact, the maximum height of the lateral walls is highest towards the central portion 110, and lowest towards the end of the left branch 120 and right branch 130.

[0304] The brush heads can be coupled to the left branch lateral wall 502L and to the right branch lateral wall 502R by ultrasonic welding or a biocompatible glue (e.g. a UV glue). Alternatively or in combination, as shown in figures 32-33, the left branch lateral wall 502L and to the right branch lateral wall 502R may comprise a lateral series of recesses 504 extending in line along the left branch 120 and the right branch 130 of the mouthpiece 100. Each recess of the lateral series of recesses 504 may extend in depth along a direction parallel or transversal (but not orthogonal) to the mouthpiece virtual plane. The lateral series of recesses 504 may define holes passing through the lateral walls.

[0305] Notably, the lateral series of recesses 504 are positioned on both the lateral walls of the first and second motion-transfer rods 500a, 500b.

[0306] Each of the left branch lateral wall 502L and the right branch lateral wall 502R may comprise a first lateral series of recesses 504’ and a second lateral series of recesses 504” parallel to each other and separated to each other in height. In particular, the external left branch lateral wall 502L may comprise a first lateral series of recesses 504’ and a second lateral series of recesses 504” parallel to each other and separated to each other in height, and the external right branch lateral wall 502R may comprise a first lateral series of recesses 504’ and a second lateral series of recesses 504” parallel to each other and separated to each other in height. The parallel series or recesses may be provided similarly on the internal left / right branch lateral walls. The first lateral series of recesses 504’ and second lateral series of recesses 504” allow to position the respective brush heads at different heights, wherein the height is considered with respect to the mouthpiece virtual plane.

[0307] Accordingly, the brush heads carried by the left branch lateral wall 502L and the right branch lateral wall 502R (i.e. the posterior lateral set of brush heads 200d) can be coupled to the left branch lateral wall 502L and the right branch lateral wall 502R by means of adhesive bonding, e.g. glue, or by ultrasonic welding. Alternatively or in combination to the adhesive bonding or ultrasonic welding, the posterior lateral set of brush heads 200d includes a supporting wall 201 d, bristles 202d fixed to the supporting wall 201 d, and protrusions 203d emerging from the supporting wall 201 d, as shown in figures 34 and 35: the protrusions 203d of the supporting wall 201 d are configured to be coupled to the lateral series of recesses 504 of the left branch lateral wall 502L and right branch lateral wall 502R. The lateral series of recesses 504 may be counter shaped to the protrusions 203d of the posterior lateral set of brush heads 200d. Once the protrusions 203d of the posterior lateral set 200d are engaged with the respective recesses of the lateral series of recesses 504, the posterior lateral set 200d may be permanently fixed in place by means of adhesive bonding, e.g. by glue, or ultrasonic welding. The at least one lateral wall 502 may also comprise a front lateral wall 502F, shown in figures 26 and 27, positioned at the front portion 110 of the mouthpiece for carrying a front set of brush heads 200 for cleaning user’s front teeth, namely incisor and / or canine teeth. The front lateral wall 502F may comprise two or more external front lateral walls, distinct and separated to each other, positioned externally with respect to the arcuate profile of the mouthpiece 100. Each one of the external front lateral walls carries a single brush head of the sets of brush heads.

[0308] The front lateral wall 502F extends in height with respect to the mouthpiece virtual plane: in particular, the front lateral wall 502F may extend in height orthogonally to the mouthpiece virtual plane.

[0309] Analogously, the front lateral wall 502F may comprise two or more internal front lateral walls, distinct and separated to each other, positioned internally with respect to the arcuate profile of the mouthpiece 100. Each one of the internal front lateral walls carries a single brush head of the sets of brush heads.

[0310] It is worth noting that the two or more external front lateral walls are connected to each other only through a bottom portion of the first motion-transfer rod 500a, wherein the bottom portion of the first motion-transfer rod 500a is positioned at the level of the motion plane within the groove guide 150. Analogously, the two or more internal front lateral walls are connected to each other only through a bottom portion of the second motion-transfer rod 500, wherein the bottom portion of the second motion-transfer rod 500b is positioned at the level of the motion plane within the groove guide 150.

[0311] According to a specific configuration shown in the attached figures 19-30, the device 1000 comprises three front lateral walls arranged at the front portion 110 of the mouthpiece: in particular, the device 1000 may comprise three external front lateral walls and three internal front lateral walls arranged at the front portion 110 of the mouthpiece. The three front lateral walls are separated and distinct to each other, defining separated flat tabs. In fact, the three front lateral walls are linked to each other only through the bottom portion of the motiontransfer rod 500, in order to increase the flexibility of each tab.

[0312] The three front lateral walls may be equally spaced to each other. In particular, the three front lateral walls may be positioned symmetrically with respect to a plane of symmetry passing through the central portion 110 and orthogonal to the virtual mouthpiece plane.

[0313] A front set of brush heads 200 are coupled to the front lateral wall 500F, in particular to both the internal and the external front lateral walls. Each front lateral wall 500F may carry a single brush head of the front set: in fact, each front lateral wall 500F may carry one and only one supporting wall of a brush head of the front set.

[0314] Notably, as already disclosed for the left and right branch lateral walls 502L, 502R, the front lateral wall 502F may comprise a front series of recesses 503 configured to receive respective protrusions of the front set of brush heads 200. The sets of brush heads 200 may comprise an occlusive set 200c of brush heads 200 for cleaning a top region of the user’s posterior teeth, i.e. molar and / or premolar teeth. In particular, the occlusive set 200c of brush heads 200 are positioned only at the left branch 120 and the right branch 130 of the mouthpiece 100 (not at the front portion 110) for cleaning the top region of the user’s posterior teeth. The front portion 110 of the mouthpiece 100 is not provided with the occlusive set 200c of brush heads 200.

[0315] The bristles 202c of the occlusive set 200c of the brush heads 200 extend away from a plane comprising the arcuate profile of the mouthpiece 100, and are oriented substantially orthogonal the this plane. In detail, the occlusive set 200c of brush heads 200 may be interposed between the external set 200a and the internal set 200b of brush heads 200. In particular, the occlusive set 200c of the brush heads 200 may be interposed between the brush heads 200d of the posterior lateral set.

[0316] It is worth noting that each of the brush head 200 of the occlusive set 200c can be fixed either to the first motion-transfer rod 500a or to the second motion-transfer rod 500b, in order to keep flexibility between the external and the internal brush heads. In fact, each of the brush heads 200 of the occlusive set 200c can be fixed only to the first motion-transfer rod 500a, as shown in figure 28, or only to the second motion-transfer rod 500b as shown in figure 29: thus the figure 29 is alternative, for the arrangement of the occlusive set 200c, to the figure 28.

[0317] Alternatively, some of the brush heads 200 of the occlusive set 200c can be fixed to the first motion-transfer rod 500a, and the remaining brush heads 200 of the occlusive set 200c can be fixed to the second motion-transfer rod 500b.

[0318] The brush heads 200 of the occlusive set 200c comprise supporting walls 201c distinct to each other and supporting the respective bristles 202c. In fact, each brush head 200 of the occlusive set 200c of brush heads 200 is composed of a single supporting wall 201c and a number of bristles attached to this supporting wall 201c. The supporting walls 201c define a substantially flat tab.

[0319] The supporting walls 201c of the occlusive set 200c of brush heads 200 may further comprise one or more protrusions 203c extending opposite to the bristles 202c. In particular, each supporting wall 201c of the occlusive set 200c may comprise two or more protrusions 203c, wherein these protrusions 203c are pin-shaped.

[0320] The protrusions 203c on the supporting walls 201 c of the occlusive set 200c of brush heads 200 may be positioned towards one side of the supporting walls 201c. In other terms, given a medial axis MA of the supporting wall 201c equidistant from an external side an internal side of the supporting wall 201 c of the occlusive set 200c, the protrusions 203 are positioned only on one side with respect to the medial axis MA. Notably, the medial axis MA is parallel to the in line extension of the recesses 501a, 501b.

[0321] According to the embodiment comprising the protrusions 203c of the occlusive set 200c, the first motion-transfer rod 500a comprises a first series of recesses 501a extending in line along the left branch 120 and / or the right branch 130, while the second motion-transfer rod 500b comprises a second series of recesses 501b extending in line along the left branch 120 and the right branch 130 of the mouthpiece 100, as shown in figures 26-27, and 32-33. Both the first and the second series of recesses 501a, 501b are adapted to receive the protrusions 203c of the supporting walls of the occlusive set 200c of the brush heads. The protrusions 203c of a single supporting wall 201c of the occlusive set 200c of brush heads 200 are inserted either into the recesses 501a of the first motion-transfer rod 500a or into the recesses 501 b of the second motion-transfer rod 500b. De facto, the occlusive set 200c of brush heads are coupled to the first motion-transfer rod 500a or to the second motiontransfer rod 500b by means of the protrusions 203c. Thus, a straight line passing through the protrusions 203c of a single brush head of the occlusive set 200c is parallel to the in line extension of the respective series of recesses.

[0322] Notably, each recess of the first series of recesses 501a and second series of recesses 501 b is counter shaped to the protrusions 203c of the occlusive set 200c: in particular, the protrusions 203c fit into the respective recesses by compression. Once the protrusions 203c of the occlusive set 200c are engaged with the respective recesses of the first or second series of recesses 501a, 501 b, the occlusive set 200c may be permanently fixed in place by means of adhesive bonding, e.g. by glue, or ultrasonic welding.

[0323] The recesses of the first series 501a may be staggered, as clearly shown in figure 23, with respect to the recesses of the second series 501b, to increase a spatial resolution for positioning the occlusive set of brush heads 200 along the extension of the mouthpiece. In other terms, each recess of the first series of recesses 501a is interposed, according to a direction parallel to said in line extension of the first series of recesses 501a, between the recesses of the second series 501b. Thus, given a virtual line VL, passing through a center of a recess of the first series 501a orthogonally to the line extension of the first series of recesses 501a, this virtual line VL passes between two adjacent recesses of the second series 501b.

[0324] According to figures 22-29, each recess of the first series of recesses 501a of the first motion-transfer rod 500a and each recess of the second series of recesses 501b of the second motion-transfer rod 500b extend in depth along a direction transversal, optionally orthogonal, to the mouthpiece virtual plane VP. In this case, the first series of recesses 501a and the second series of recesses 501 b are arranged on a top wall of respectively the first motion-transfer rod 500a and the second motion-transfer rod 500b, wherein this top wall is substantially parallel to the mouthpiece virtual plane VP.

[0325] Alternatively, according to figures 32-39A, each recess of the first series of recesses 501a of the first motion-transfer rod 500a and each recess of the second series of recesses 501 b of the second motion-transfer rod 500b may extend in depth along a direction substantially parallel to the mouthpiece virtual plane. In fact, the first series of recesses 501a and the second series of recesses 501b may be arranged on a side surface of respectively the first motion-transfer rod 500a and the second motion-transfer rod 500b. The side surface is thus substantially orthogonal to the mouthpiece virtual plane VP.

[0326] Notably, the side of the first motion-transfer rod 500a carrying the first series of recesses 501a faces internally with respect to the arcuate profile of the mouthpiece, while the side of the second motion-transfer rod 500b carrying the second series of recesses 501b faces externally with respect to the arcuate profile of the mouthpiece.

[0327] In fact, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, in particular within the groove guide 150, the first series of recesses 501a faces the second series of recesses 501b.

[0328] As already mentioned before according to figure 23, the recesses of the first series 501a may be staggered with respect to the recesses of the second series 501b also according to the embodiment wherein the first series of recesses 501 a and the second series of recesses 501 b are arranged on the side of the respective first and second motion-transfer rods 500a, 500b, according to figures 32-33. In fact, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, in particular within the groove guide 150, the first series of recesses 501a are staggered with respect to the second series of recesses 501 b to increase a spatial resolution for positioning the occlusive set 200c of brush heads 200 along the extension of the mouthpiece. In other terms, each recess of the first series of recesses 501a is interposed, according to a direction parallel to said in line extension of the first series of recesses 501a, between the recesses of the second series 501b. Thus, given a virtual line VL, passing through a center of a recess of the first series 501a orthogonally to the line extension of the first series of recesses 501a, this virtual line VL passes between two adjacent recesses of the second series 501 b.

[0329] According to this alternative shown in Figs. 32-39A, each brush head of the occlusive set 200c comprises a tab 204c protruding from the respective supporting wall 201c opposite to the bristles, wherein the protrusions 203c of the occlusive set 200c are carried by said tab 204c. In fact, the supporting wall 201c is interposed between the bristles and said tab 204c, in particular considering a direction orthogonal to the mouthpiece virtual plane VP.

[0330] Notably, when the first motion-transfer rod 500a and the second motion-transfer rod 500b are mounted on the mouthpiece 100, specifically within the groove guide 150, the tab 204c of the occlusive set 200c of brush heads is interposed, optionally by contact, between the first motion-transfer rod 500a and the second motion-transfer rod 500b. As a result, the protrusions 203c of the tab 204c remain engaged within the first or second series of recesses 501a, 501b and cannot disengage unless the first and second motion-transfer rods 500a, 500b are separated, as clearly shown in figure 39.

[0331] The protrusions 203c extend, when the brush head of the occlusive set 200c is mounted on the mouthpiece 100, from the tab 204c along a direction substantially parallel to the mouthpiece virtual plane VP. In fact, the protrusions 203c extend in length parallel to the depth extension of the first series of recesses 501a and the second series of recesses 501b. The protrusions 203c extend in length orthogonally to the tab 204c. The protrusions 203c may be pin-shaped. Each tab may comprise two or more protrusions 203c.

[0332] Manufacturing process 2000 of the second embodiment of the dental cleaning device 1000

[0333] The disclosure is also directed to a manufacturing process 2000 of the dental cleaning device 1000 previously described. The manufacturing process 2000 comprise a step of providing 2001 the handle 2, the mouthpiece 100, the sets of brush heads 200, and the at least one motion-transfer rod 500. The at least one motion-transfer rod 500 comprises at least one lateral wall 502 extending in height transversal to a motion plane of the at least one motion-transfer rod 500, wherein the lateral wall 502 comprises an outer surface, facing outwardly the arcuate profile of the mouthpiece 100, and an inner surface facing inwardly the arcuate profile of the mouthpiece 100. The motion plane corresponds to the mouthpiece virtual plane.

[0334] The process 2000 further comprises a step of scanning 2002 the user’s dental arch, for example by means of a 3D or 2D scanner. Alternatively, the scanning step may be performed by means of x-rays or by manually measuring the size of the user’s teeth. Alternatively, the scanning step 2002 may be performed by making a cast of the dental arch, for example a plaster cast.

[0335] Based on the scanning step 2002, the process 2000 comprises a further step of determining 2003 whether to couple the brush heads 200 of the sets of brush heads to the inner surface or the outer surface of the lateral wall 502 of motion-transfer rod 500b. Optionally, the determination step 2003 may be based on the size of each tooth or the size of the dental arch obtained by means of the scanning step.

[0336] Lastly, the process 2000 may include a step of coupling 2004 the brush heads 200 to the inner surface or the outer surface of the lateral wall 502 of the at least one motion-transfer rod 500b based on the determination step 2003.

[0337] If the motion transfer rod 500 includes the first and second motion-transfer rods 500a, 500b, the manufacturing process 2000 comprises to couple the external set 200a of brush heads 200 either to the inner surface or to the outer surface of the external lateral wall 502a based on the determination step, and the internal set 200b of brush heads 200 either to the inner surface or to the outer surface of the internal lateral wall 502b based on the determination step.

[0338] Given an external lateral wall 502a of the motion-transfer rod 500 (either the motion-transfer rod 500 is single or if it comprises the first and the second motion-transfer rods 500a, 500b) external to the arcuate profile of the mouthpiece, and an internal lateral wall 502b of this motion-transfer rod 500 internal to the arcuate profile of the mouthpiece, the supporting walls of the brush heads can be selectively coupled to the outer surface and the inner surface of the external lateral wall 502a, and to the outer surface and the inner surface of the internal lateral wall 502b.

[0339] Thus, if the scanning step determines that the user’s tooth is larger than a predefined size, the process 2000 may determine to couple the external set 200a of brush heads to the outer surface of the external lateral wall 502a, and to couple the internal set 200b of brush heads to the inner surface of the internal lateral wall 502b.

[0340] On the contrary, if the scanning step determines that the user’s tooth is smaller than a predefined size, the process may determine to couple the external set 200a of brush heads to the inner surface of the external lateral wall 502a, and to couple the internal set 200b of brush heads to the outer surface of the internal lateral wall 502b. In addition, there is nothing to prevent to couple the external set 200a of brush heads to the outer surface of the external lateral wall 502a, and to couple the internal set 200b of brush heads to the outer surface of the internal lateral wall 502b.

[0341] In addition, there is nothing to prevent to couple the external set 200a of brush heads to the inner surface of the external lateral wall 502a, and to couple the internal set 200b of brush heads to the inner surface of the internal lateral wall 502b.

[0342] The determination step 2003 may apply to both the front lateral wall 502F and to the left / right lateral walls 502L, 502R. The supporting walls of the brush heads of the front set can be couple either to the outer surface or to the inner surface of the front lateral wall 502F. Analogously, the supporting walls of the brush heads of the posterior lateral set can be couple either to the outer surface or to the inner surface of the left or right branch lateral walls 502L, 502R.

[0343] The determination step 2003 may further comprise determining a height with respect to the motion plane at which to fix a brush head of the sets of brush heads to the lateral wall 502. The height may be determined for each brush head of the sets of brush heads, wherein the height is measured as a distance from the motion plane up to a first bristle of the respective brush head.

[0344] As a consequence, the coupling step may comprise coupling each brush head of the sets of brush heads at this height with respect to the motion plane: in particular the coupling step may comprise coupling each brush head of the sets of brush heads at a respective height with respect to the motion plane defined at the determination step.

[0345] Furthermore, the determination step may comprise determining whether to couple the occlusive set 200c of brush heads 200 either to the first series of recesses 501a of the first motion-transfer rod 500a or to the second series of recesses 501b of the second motiontransfer rod 500b. In detail, the determination step may comprise determining the position of each brush head 200 of the occlusive set 200c, namely whether to couple a first brush head 200 of the occlusive set 200c either to the first series of recesses 501a of the first motion-transfer rod 500a or to the second series of recesses 501b of the second motiontransfer rod 500b, and whether to couple a second brush head 200 of the occlusive set 200c either to the first series of recesses 501a of the first motion-transfer rod 500a or to the second series of recesses 501 b of the second motion-transfer rod 500b.

[0346] According to the embodiment comprising the first lateral series of recesses 504’ and the second lateral series of recesses 504” parallel to each other and separated to each other in height, the coupling step may comprise to couple protrusions 203d of the brush heads either to the first lateral series of recesses 504’ or the second lateral series of recesses 504” to vary a position in height of the brush heads with respect to the mouthpiece virtual plane.

Claims

CLAIMS1. Dental cleaning device (1000) comprising: a handle (2) configured for being grabbed by a user; a mouthpiece (100) connected or connectable to said handle (2) and configured for being inserted into the user’s mouth, wherein the mouthpiece (100) defines an arcuate profile; sets of brush heads (200) positioned on the mouthpiece (100) and configured for cleaning, during a use condition of said dental cleaning device, the user’s teeth, a motor operatively connected to said sets of brush heads (200) and configured to cause a vibration motion of said sets of brush heads (200); a transmission system connecting kinematically the motor to the sets of brush heads (200), wherein the transmission system includes at least one motion-transfer rod (500) operatively connected to the motor and extending along the arcuate profile of the mouthpiece (100).

2. Dental cleaning device according to the preceding claim, wherein the arcuate profile of the mouthpiece (100) comprises a left branch (120), a right branch (130), and a front portion (110) interposed in connection between the left branch (120) and the right branch (130), wherein the left branch (120), the front portion (110) and the right branch (130) of the mouthpiece (100) are consecutive to each other defining the arcuate profile of the mouthpiece (100), and wherein at least one of said at least one motion-transfer rod (500) extends in one piece along said arcuate profile of the mouthpiece (100), the sets of brush heads (200) moving together with the at least one motion-transfer rod (500), the sets of brush heads (200) being fixed to the at least one motion-transfer rod (500).

3. Dental cleaning device according to the preceding claim, wherein the arcuate profile of the mouthpiece (100) includes a groove guide (150), in particular defining a channel, extending continuously along the front portion (110), the left branch (120) and the right branch (130) of the mouthpiece (100), wherein the at least one motion-transfer rod (500) is arranged at least partially within said groove guide (150),wherein the at least one motion-transfer rod (500) is configured to move, in particular to slide, with respect to the mouthpiece (100) within said groove guide (150) to cause the vibration motion of the sets of brush heads (200), wherein the at least one motion-transfer rod (500) is configured to flex while moving within said groove guide (150) to follow the arcuate profile of the mouthpiece (100), wherein said at least one motion-transfer rod (500) in one piece is made of plastic material, wherein the at least one motion transfer rod (500) comprises a continuous structural profile (550) following the arcuate profile of the mouthpiece (100), in particular extending between the left branch (120) up to the right branch (130), to transmit the vibration motion to the sets of brush heads, the continuous structural profile (550) being positioned completely within the groove guide (150) facing a rear wall (150c) of the groove guide (150).

4. Dental cleaning device according to any one of the preceding claims, wherein the at least one motion-transfer rod (500) comprises a first motion-transfer rod (500a) and a distinct second motion-transfer rod (500b) both extending along the arcuate profile of the mouthpiece (100), wherein the second motion-transfer rod (500b) is positioned internally to the first motiontransfer rod (500a) with respect to the arcuate profile of the mouthpiece (100), the first motion-transfer rod (500a) and the second motion-transfer rod (500b) being positioned side by side all along the arcuate profile of the mouthpiece (100), and wherein the brush heads of said sets are fixed to both the first motion-transfer rod (500a) and the second motion-transfer rod (500b).

5. Dental cleaning device according to preceding claim, wherein the sets of brush heads (200) comprise at least an external set (200a) of brush heads (200) for cleaning an external surface of the user’s teeth, and an internal set (200b) of brush heads (200) for cleaning an internal surface of the user’s teeth, wherein the external set (200a) of brush heads (200) is fixed only to the first motiontransfer rod (500a), and the internal set (200b) of brush heads (200) is fixed only to the second motion-transfer rod (500a), wherein the external set (200a) of brush heads (200) and the internal set (200b) of brush heads (200) are separated and independent to each other.

6. Dental cleaning device according to any one of the preceding claims 4 and 5, wherein the sets of brush heads (200) comprise an occlusive set (200c) of brush heads (200) for cleaning a top region of the user’s teeth, each of the brush heads (200) of said occlusive set (200c) being fixed either to the first motion-transfer rod (500a) or to the second motion-transfer rod (500b), in particular each of the brush heads (200) of said occlusive set (200c) being fixed only to the first motiontransfer rod (500a) or only to the second motion-transfer rod (500b), the occlusive set (200c) of brush heads (200) being interposed between the external set (200a) of brush heads (200) and the internal set (200b) of brush heads (200), optionally wherein the occlusive set (200c) of brush heads (200) are positioned only at the left branch (120) and / or right branch (130) of the mouthpiece (100) for cleaning the top region of user’s molar teeth.

7. Dental cleaning device according to any one of the preceding claims 4 to 6, wherein the first motion-transfer rod (500a) is engaged by a connection coupling (501) to the second motion-transfer rod (500b) at a mutual central region located substantially at the front portion (110) of the mouthpiece (100), optionally said central region of the first and second motion-transfer rods (500a, 500b) being equidistant from the left branch (120) and the right branch (130) of the mouthpiece, in particular a plane of symmetry of the mouthpiece (100) crossing said central region of the first and second motion-transfer rods (500a, 500b), wherein said connection coupling (501) is configured to transfer a vibration motion of the first motion-transfer rod (500a) to the second motion-transfer rod (500b) so that the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are movable together according to the same vibration motion.

8. Dental cleaning device according to the preceding claim in combination with claim 2, wherein the first motion-transfer rod (500a) is engaged to the second motion-transfer rod (500b) only at said mutual central region, wherein the first motion-transfer rod (500a) at the left branch (120) and the right branch (130) is disengaged from the second motion-transfer rod (500b).

9. Dental cleaning device according to any one of the preceding claims in combination with claim 4, wherein each one of the first motion-transfer rod (500a) and the second motiontransfer rod (500b) are made in one piece.

10. Dental cleaning device according to the preceding claim in combination with claims 2 and 4, wherein the sets of brush heads (200), in particular the occlusive set (200c) of brush heads (200), comprise a plurality of supporting walls (201c, 201 d) distinct to each other and supporting respective bristles (202c), said supporting walls (201c, 201 d) comprising one or more, optionally two or more, protrusions (203c, 203d), for example protruding pins, wherein the first motion-transfer rod (500a) comprises a first series of recesses (501a) extending in line along the left branch (120) and / or the right branch (130), wherein the second motion-transfer rod (500b) comprises a second series of recesses (501 b) extending in line along the left branch (120) and / or the right branch (130), both the first series and the second series of recesses (501a, 501b) being adapted to receive the protrusions (203c, 203d) of the supporting walls (201c, 203d) of the brush heads (200), wherein said recesses (501a) of the first series are staggered with respect to said recesses (501b) of the second series to increase a spatial resolution for positioning the set of brush heads (200), in particular the occlusive set (200c) of brush heads (200), in particular wherein each recess of the first series of recesses (501a) is interposed, according to a direction parallel to said in line extension of the first series of recesses (501a), between the recesses of the second series of recesses (501b), in particular wherein the one or more protrusions (203c, 203d) of a single supporting wall are inserted either into the recesses (501a) of the first motion-transfer rod (500a) or of the second motion-transfer rod (500b).

11. Dental cleaning device according to the preceding claim, the first series of recesses (501a) and the second series of recesses (501b) are positioned in line on a side surface of respectively the first motion-transfer rod (500a) and the second motion-transfer rod (500b), wherein the side surface of the first motion-transfer rod (500a) carrying the first series of recesses (501a) faces internally with respect to the arcuate profile of the mouthpiece, while the side surface of the second motion-transfer rod (500b) carrying the second series of recesses (501b) faces externally with respect to the arcuate profile of the mouthpiece, wherein, when the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are mounted on the mouthpiece (100), the first series of recesses (501a) faces the second series of recesses (501b), wherein each brush head of the occlusive set (200c) comprises a tab (204c) protruding from the respective supporting wall (201c) opposite to the bristles,wherein the protrusions (203c) of the occlusive set (200c) are carried by said tab (204c), wherein, when the first motion-transfer rod (500a) and the second motion-transfer rod (500b) are mounted on the mouthpiece (100), the tab (204c) of the occlusive set (200c) of brush heads is interposed by contact between the first motion-transfer rod (500a) and the second motion-transfer rod (500b).

12. Dental cleaning device according to any one of the preceding claims, comprising at least one lateral wall (502) extending in height from the at least one motion-transfer rod (500) transversal to a motion plane of the at least one motion-transfer rod (500), and optionally arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), wherein said at least one lateral wall (502) comprises an outer surface facing outwardly the arcuate profile of the mouthpiece (100), and an inner surface facing inwardly the arcuate profile of the mouthpiece (100), wherein each brush head of the sets of brush heads (200) are selectively mountable at the outer surface and the inner surface of said lateral wall (502) of the at least one motion-transfer rod (500), optionally wherein each brush head of the sets of brush heads (200) are coupled to the lateral wall (502) by ultrasonic welding or UV glue.

13. Dental cleaning device according to the preceding claim in combination with claim 5, wherein the at least one lateral wall (502) comprises an external lateral wall (502a) extending in height from the first motion-transfer rod (500a), transversal to a motion plane of the first motion-transfer rod (500a), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), wherein the supporting walls of the external set (200a) of brush heads (200) are fixed to said external lateral wall (502a) of the first motion-transfer rod (500a), and wherein the at least one lateral wall (502) comprises an internal lateral wall (502b) extending in height from the second motion-transfer rod (500b), transversal to a motion plane of the second motion-transfer rod (500a) in particular corresponding to the motion plane of the first motion-transfer rod (500a), and arranged at one or more between the left branch (120), the right branch (130) and the front portion (110) of the mouthpiece (100), wherein the supporting walls of the internal set (200b) of brush heads (200) are fixed to said internal lateral wall (502b) of the second motion-transfer rod (500a),the supporting walls of the internal set (200b) of brush heads (200) being independent from the supporting walls of the external set (200a) of brush heads (200), wherein the supporting walls of the external set (200a) of brush heads (200) are mountable both at an inner surface and an outer surface of said external lateral wall (502a) of the first motion-transfer rod (500a), and wherein the supporting walls of the internal set (200b) of brush heads (200) are mountable both at an inner surface and an outer surface of said internal lateral wall (502b) of the second motion-transfer rod (500b), in particular wherein the external lateral wall (502a) is external to the arcuate profile of the mouthpiece (100), and the internal lateral wall (502b) is internal to the arcuate profile of the mouthpiece (100).

14. Dental cleaning device according to any one of the preceding claims 12 and 13, the at least one lateral wall (502) comprises a lateral series of recesses (504), in particular extending in line along the left branch (120) and the right branch (130) of the mouthpiece (100), the at least one lateral wall (502) comprising a first lateral series of recesses (504’) and a second lateral series of recesses (504”) parallel to each other and separated to each other in height, wherein both the first lateral series of recesses (504’) and the second lateral series of recesses (504”) are configured to receive into said protrusions (203d) of the brush heads, wherein, in a mounted configuration, said protrusions (203d) of the brush heads are received into either the first lateral series of recesses (504’) or the second lateral series of recesses (504”) to allow customization in position of the brush heads in height, in particular wherein said height is considered with respect to the plane comprising the arcuate profile of the mouthpiece.

15. Dental cleaning device according to any one of the preceding claims, wherein the at least one motion-transfer rod (500) is movable along the mouthpiece (100) back and forth around a middle position defining the vibration motion of the sets of brush heads (200), said vibration motion having a respective frequency and amplitude around said middle position, wherein said frequency is comprised between 16 Hz and 34 Hz, and said amplitude is comprised between 0,7 mm and 3 mm, optionally between 1 ,5 mm and 2 mm, in particular 2 mm,wherein the sets of brush heads (200) are fixed to the at least one motion-transfer rod (500) to move according to said vibration motion, said vibration motion being a translational motion.

16. Manufacturing process (2000) of the dental cleaning device (1000) of any one of the preceding claims, wherein said manufacturing process (2000) comprises: providing (2001) the handle (2), the mouthpiece (100), the sets of brush heads (200), and the at least one motion-transfer rod (500), wherein said at least one motion-transfer rod (500) comprises at least one lateral wall (502) extending in height, transversal to a motion plane of the at least one motion-transfer rod (500), wherein said at least one lateral wall (502) comprises an outer surface, facing outwardly the arcuate profile of the mouthpiece (100), and an inner surface facing inwardly the arcuate profile of the mouthpiece (100); scanning (2002) the user’s dental arch; determining (2003) whether to couple the brush heads (200) to the inner surface or the outer surface of the at least one lateral wall (502) of the at least one motiontransfer rod (500b) based on a size of each tooth or of the dental arch obtained by the scanning step (2002); coupling (2004) the brush heads (200) to the inner surface or the outer surface of the lateral wall of the at least one motion-transfer rod (500) based on the determination step (2003).

17. Manufacturing process according to the preceding claim, wherein the at least one motion-transfer rod (500) comprises a first motion-transfer rod (500a) and a distinct second motion-transfer rod (500b) both extending along the arcuate profile of the mouthpiece (100), wherein the first motion-transfer rod (500a) comprises an external lateral wall extending in height, transversal to a motion plane of the first motion-transfer rod (500a), and wherein the second motion-transfer rod (500b) comprises an internal lateral wall extending in height, transversal to a motion plane of the second motion-transfer rod (500a) in particular corresponding to the motion plane of the first motion-transfer rod (500a), wherein an external set (200a) of brush heads (200) are fixable to said external lateral wall of the first motion-transfer rod (500a), wherein an internal set (200b) of brush heads (200) are fixable to said internal lateral wall of the second motion-transfer rod (500a),wherein the coupling step comprises to couple: the external set (200a) of brush heads (200) either to the inner surface or to the outer surface of the external lateral wall based on the determination step, and the internal set (200b) of brush heads (200) either to the inner surface or to the outer surface of the internal lateral wall based on the determination step; an occlusive set (200c) of brush heads (200) either to a first series of recesses (501 a) of the first motion-transfer rod (500a) or to a second series of recesses (501 b) of the second motion-transfer rod (500b), wherein the determination step further comprises determining a height with respect to said motion plane at which to fix the brush heads to the at least one lateral wall (502).

18. Manufacturing process according to any one of the preceding claims 16 and 17, wherein the at least one lateral wall (502) comprises a lateral series of recesses (504), in particular extending in line along the left branch (120) and the right branch (130) of the mouthpiece (100), the at least one lateral wall (502) comprising a first lateral series of recesses (504’) and a second lateral series of recesses (504”) parallel to each other and separated to each other in height, wherein the coupling step comprises to couple protrusions (203d) of the brush heads either to the first lateral series of recesses (504’) or the second lateral series of recesses (504”).

19. Manufacturing process according to any one of the preceding claims from 16 to 18, wherein the scanning step (2002) is performed by a scanner 3D or scanner 2D or by making a cast of the dental arch, for example a plaster cast.

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