Dental treatment auxiliary device, shell-shaped dental appliance, and dental instrument

Abstract

The application discloses a dental treatment auxiliary device, a shell-shaped dental appliance and a dental instrument. The dental instrument comprises the shell-shaped dental appliance and the dental treatment auxiliary device used in cooperation with the shell-shaped dental appliance. The dental treatment auxiliary device comprises a base, a retaining portion and a sliding channel. The retaining portion is arranged on the distal side of the base. The sliding channel penetrates the base along the mesial-distal direction. The retaining portion is at least partially wrapped by the shell-shaped dental appliance to retain the shell-shaped dental appliance and the teeth. The sliding channel has a structure for enabling the teeth equipped with the dental treatment auxiliary device to slide along the guide rail penetrating the sliding channel according to a predetermined track under the action of a treatment force. The dental treatment auxiliary device avoids the problem that the adjacent teeth of the missing teeth collapse to the missing position during the treatment, improves the treatment effect and shortens the treatment period.

Description

Technical Field

[0001] This invention belongs to the field of orthodontic technology, and more specifically relates to the field of clear aligner technology, particularly to a dental orthodontic auxiliary device, a shell-shaped dental appliance, and dental instruments. Background Technology

[0002] In the field of orthodontics, gaps between teeth after extraction, recurrence of extraction gaps during retention periods, and other congenital dentition gaps are common problems encountered by clinicians. In fixed orthodontic treatment, straight wire appliances or edgewise appliances are generally used to close these gaps. Edgewise appliances are traditional orthodontic appliances where all brackets are identical, and the archwire must be bent in three sequences to compensate for differences in tooth shape and position. This is relatively complex to operate clinically, and errors in archwire bending can sometimes occur due to insufficient clinical experience, leading to poor treatment results. Straight wire appliances eliminate the three sequences of archwire bending through structural improvements to the bracket base. Since the size, shape, and rotation of teeth vary greatly from person to person, the bracket base structure must be modified differently for each individual's dental condition. However, custom-made brackets increase treatment costs and are not universally applicable.

[0003] In recent years, invisible orthodontic technology has become increasingly well-known, favored by many patients due to its discreet and aesthetically pleasing characteristics. In current invisible orthodontic treatments, for cases involving tooth extraction to close gaps, the aligner applies force to the crown, and the movement of the crown then drives the movement of the tooth root. Therefore, the root movement lags behind the crown movement. When the crown tilts towards the missing tooth, insufficient friction between the aligner and the tooth can cause it to detach, interrupting treatment. Furthermore, the force applied by the invisible aligner is not continuous; when the force decreases, the tooth root may not have moved into position, leading to treatment failure and making subsequent treatment more difficult.

[0004] This application provides a technical improvement solution to address the above-mentioned problems. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the deficiencies of existing technologies and provide a dental orthodontic auxiliary device for use in conjunction with a shell-shaped orthodontic appliance to close extraction gaps. This device avoids or reduces the tilting of adjacent teeth towards the missing tooth while increasing the retention force between the shell-shaped orthodontic appliance and the teeth during orthodontic treatment. This invention also provides a shell-shaped dental appliance for use with the aforementioned dental orthodontic auxiliary device, and a dental instrument composed of both. To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0006] A dental orthodontic auxiliary device, used in conjunction with a shell-shaped dental appliance, includes a base, a retention portion, and a sliding channel. The retention portion is located distal to the base, and the sliding channel extends through the base in a mesiodistal direction. The retention portion is at least partially enclosed by the shell-shaped dental appliance to retain the appliance in place with the teeth. The sliding channel has a structure that allows the tooth fitted with the dental orthodontic auxiliary device to slide along a guide rail passing through the sliding channel along a predetermined trajectory under the action of orthodontic forces. This dental orthodontic auxiliary device does not apply clinically significant orthodontic forces to the teeth it is attached to; instead, the orthodontic forces are applied to the teeth it encloses by the shell-shaped dental appliance, simplifying the mechanical system during orthodontic treatment and making tooth movement more aligned with orthodontic expectations.

[0007] Preferably, the sliding channel is located near the gingival end of the base.

[0008] Preferably, the sliding channel is clearance-fitted with the guide rail, and the clearance fit has a constraint that causes the sliding channel to slide along the guide rail along a predetermined trajectory. The constraint can ensure that the teeth equipped with dental orthodontic aids do not experience undesirable tilting or torque.

[0009] Preferably, the cross-section of the sliding channel along the long axis of the tooth is circular or polygonal.

[0010] Preferably, the cross-section of the sliding channel along the long axis of the tooth and the cross-section of the guide rail along the long axis of the tooth are substantially the same.

[0011] Preferably, the cross-section of the sliding channel along the long axis of the tooth and the cross-section of the guide rail along the long axis of the tooth are not the same.

[0012] Preferably, the base protrudes distally towards the distal tooth at the distal gingival end to form the retention portion.

[0013] Preferably, the outer contour shape of the retaining portion is one of a circle, a semi-circle, a polygon, or a combination of the above shapes.

[0014] Preferably, the length of the retention portion in the long axis direction of the tooth accounts for 20% to 50% of the length of the dental orthodontic auxiliary device in the long axis direction of the tooth.

[0015] Preferably, the base protrudes from the proximal gingival end toward the distal tooth side to form the carrier of the sliding channel, and the sliding channel extends through the carrier in a mesiodistal direction.

[0016] Preferably, the retaining portion and the carrier are positioned at a distance along the long axis of the tooth.

[0017] Preferably, the fixing part and the carrier are provided with a groove between the long axis of the tooth.

[0018] More preferably, the length of the groove in the long axis direction of the tooth accounts for 20% to 40% of the length of the dental orthodontic auxiliary device in the long axis direction of the tooth.

[0019] Preferably, the base has a traction portion near the gingiva, which is formed by the base extending in the mesiodistal direction and / or the long axis direction of the tooth.

[0020] A shell-shaped dental appliance, used in conjunction with any of the aforementioned dental orthodontic aids, includes a receiving cavity for accommodating multiple teeth, at least two of which are fitted with the dental orthodontic aid. The receiving cavity includes a first receiving cavity for accommodating the multiple teeth without the dental orthodontic aid and a second receiving cavity for accommodating the multiple teeth with the dental orthodontic aid. The second receiving cavity at least partially encloses the retention portion. The receiving cavity has a geometry for positioning the multiple teeth from a first position to a second position.

[0021] Preferably, the second receiving cavity encloses at least a portion of the retaining portion.

[0022] A shell-shaped dental appliance, used in conjunction with any of the aforementioned dental orthodontic aids, includes a receiving cavity for accommodating multiple teeth, at least two of which are fitted with the dental orthodontic aid. The receiving cavity includes a first receiving cavity for accommodating the multiple teeth without the dental orthodontic aid and a second receiving cavity for accommodating the multiple teeth with the dental orthodontic aid. The second receiving cavity at least partially encloses the retention portion and the groove. The receiving cavity has a geometry for positioning the multiple teeth from a first position to a second position.

[0023] A dental instrument includes a shell-shaped orthodontic appliance and any one of the aforementioned orthodontic auxiliary devices. The shell-shaped orthodontic appliance includes a receiving cavity for accommodating multiple teeth, at least two of which are fitted with the orthodontic auxiliary device. The receiving cavity includes a first receiving cavity for accommodating the multiple teeth without the orthodontic auxiliary device and a second receiving cavity for accommodating the multiple teeth with the orthodontic auxiliary device. The second receiving cavity at least partially encloses the retention portion. The receiving cavity has a geometric structure for positioning the multiple teeth from a first position to a second position. The teeth fitted with the orthodontic auxiliary device move along a guide rail to a target position according to a predetermined trajectory under the action of orthodontic force.

[0024] The dental orthodontic auxiliary device, shell-shaped dental appliance, and dental instruments composed of the two used together provided by this invention can bring at least one of the following beneficial effects:

[0025] 1. The dental orthodontic auxiliary device used in conjunction with the shell-shaped dental appliance in this invention is provided with a retention part, so that when the shell-shaped dental appliance wraps around the retention part, it generates a retention force with the teeth to prevent them from falling off the teeth. At the same time, the sliding channel provided on the dental orthodontic auxiliary device can enable the dental orthodontic auxiliary device to drive the teeth to slide along a preset trajectory on the fixed guide rail, thereby closing the gaps between the teeth.

[0026] 2. The dental orthodontic auxiliary device, shell-shaped dental appliance, and the dental instrument formed by the combination of the two in this invention can solve the problem of adjacent teeth tilting towards the missing tooth when closing the gap. This avoids undesirable tilting movement and torque of the adjacent teeth in the gap during the process of closing the gap, thereby improving the orthodontic effect and shortening the orthodontic cycle.

[0027] 3. The dental orthodontic auxiliary device of the present invention can also be used alone as a retention attachment or in combination with a fixed guide rail, avoiding the need to attach attachments and brackets to the tooth surface multiple times due to different orthodontic needs, thereby reducing damage to the patient's teeth.

[0028] 4. The dental orthodontic auxiliary device of the present invention is further provided with a traction part for use in conjunction with a ligature or rubber chain. The retention effect generated by the shell-shaped orthodontic appliance wrapping the retention part on the dental orthodontic auxiliary device, the sliding effect generated by the sliding channel and fixed guide rail on the dental orthodontic auxiliary device, and the traction effect generated by the traction part and traction component on the dental orthodontic auxiliary device can achieve mutual compensation during the treatment process by working together, and has better treatment effect for complex cases. Attached Figure Description

[0029] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods.

[0030] Figure 1 This is a schematic diagram illustrating the use of the shell-shaped dental appliance and dental orthodontic auxiliary device in this invention.

[0031] Figure 2 This is a three-dimensional structural diagram of one embodiment of the dental orthodontic auxiliary device of the present invention;

[0032] Figure 3a , Figure 3b and Figure 3c This is a schematic diagram of the clearance fit between the sliding channel and the guide rail in this invention;

[0033] Figure 4 This is a three-dimensional structural schematic diagram of another embodiment of the dental orthodontic auxiliary device of the present invention;

[0034] Figure 5This is a three-dimensional structural diagram of another embodiment of the dental orthodontic auxiliary device of the present invention;

[0035] Figure 6 for Figure 5 A side view of a dental orthodontic aid device;

[0036] Figure 7 for Figure 5 Rear view of a dental orthodontic aid device;

[0037] Figure 8 This is a schematic diagram illustrating the use of the dental instruments in this invention;

[0038] Figure 9 for Figure 8 A magnified schematic diagram of region I in the middle. Detailed Implementation

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0040] Please see Figure 1 and Figure 2 As shown, the present invention includes a dental orthodontic auxiliary device 100, a shell-shaped dental appliance 200, and a dental instrument (not labeled) formed by using the two together. The dental orthodontic auxiliary device 100 includes a base 110, a retention portion 120, and a sliding channel 130. The base 110 includes a mesial side and a distal side. The mesial surface of the base 110 is bonded to the tooth surface. Preferably, the dental orthodontic auxiliary device 100 is symmetrically arranged and bonded to the tooth surface along the clinical crown-long axis. The retention portion 120 is located at the distal gingival end of the distal side of the base 110, extending from the base 110 towards the distal tooth. The lateral protrusion is formed, and the retention part 120 and the base 110 are integrally formed or are separate structures fixed together. In this embodiment, the integrally formed structure is preferred. The retention part 120 is at least partially wrapped by the shell-shaped dental appliance 200 to retain the shell-shaped dental appliance with the teeth. The sliding channel 130 is disposed near the gingival end of the base 110 and extends through the base 110 in the mesiodistal direction. The sliding channel 130 has a structure that allows the teeth equipped with the dental orthodontic auxiliary device 100 to slide along the guide rail 300 passing through the sliding channel 130 according to a predetermined trajectory under the action of orthodontic force.

[0041] In some embodiments, the sliding channel 130 is positioned as close as possible to the gingival margin without the dental orthodontic aid 100 contacting the gums.

[0042] In some embodiments, the sliding channel 130 is clearance-fitted with the guide rail 300, and the clearance fit provides a constraint that allows the sliding channel 130 to slide along the guide rail 300 along a predetermined trajectory. A clearance fit means that the tolerance zone of the sliding channel 130 is above the tolerance zone of the guide rail 300; that is, the actual size of the sliding channel 130 is always greater than or equal to the actual size of the guide rail 300. Preferably, the actual size of the sliding channel 130 is slightly larger than the actual size of the guide rail 300. In other words, the cross-sectional area of ​​the sliding channel 130 along the long axis of the tooth is slightly larger than the cross-sectional area of ​​the guide rail 300 along the long axis of the tooth. Preferably, the gap 400 between the sliding channel 130 and the guide rail 300 is between 0.01 mm and 0.3 mm. The constraint refers to minimizing mesiodistal tilting or buccal / labial-lingual tilting during tooth movement, provided the dental orthodontic aid 100 slides on the guide rail 300. This constraint ensures the teeth move to a preset position with minimal tilting or rotation according to the treatment plan. In some embodiments, the sliding channel 130 has a circular or polygonal cross-section along the long axis of the tooth, and the guide rail 300 also has a circular or polygonal cross-section along the long axis of the tooth. The cross-sections of the sliding channel 130 and the guide rail 300 along the long axis of the tooth may be substantially the same or different. (Reference) Figure 3a As shown, the sliding channel 130 and the guide rail 300 have essentially the same circular cross-section along the long axis of the tooth. Besides the mesiodistal direction of movement, the sliding channel 130 and the guide rail 300 also have a rotational degree of freedom in the mesiodistal direction. This rotational degree of freedom may cause undesirable rotation of the teeth during orthodontic treatment. (Reference) Figure 3b As shown, the sliding channel 130 and the guide rail 300 have essentially the same cross-section along the long axis of the tooth, both being polygons. The sliding channel 130 and the guide rail 300 have degrees of freedom of movement in the mesiodistal direction. Because the polygon has multiple sides and corners, during relative movement, the multiple corner structures of the guide rail 300 can provide rotational constraints on the sliding channel 130. (Reference) Figure 3cAs shown, the sliding channel 130 and the guide rail 300 have different cross-sections along the long axis of the tooth. The cross-section of the sliding channel 130 along the long axis of the tooth is circular, while the cross-section of the guide rail 300 along the long axis of the tooth is rectangular. The sliding channel 130 and the guide rail 300 have degrees of freedom of movement in the mesiodistal direction. However, during relative movement, the contact area between the sliding channel 130 and the guide rail 300 is too small, resulting in instability when the sliding channel 130 slides on the guide rail 300. Preferably, the sliding channel 130 and the guide rail 300 should be configured as follows: Figure 3b As shown, the sliding channel 130 and the guide rail 300 have the same shape but different sizes of polygonal cross-sections along the long axis of the tooth. This allows the sliding channel 130 to slide stably under the guide rail 300 and prevents unexpected rotation, enabling the teeth equipped with the dental orthodontic auxiliary device 100 to move to a preset position along the preset trajectory of the guide rail 300. The guide rail 300 can be made of stainless steel, nickel-titanium alloy, cobalt-chromium alloy, glass fiber, or other rigid materials to prevent deformation of the guide rail 300 during use from affecting the orthodontic treatment.

[0043] It should be clarified that the "orthodontic force" and "corrective force" described in this invention refer to the force exerted by the shell-shaped orthodontic appliance 200 on the teeth it encloses. The force generated by the cooperation between the sliding channel 130 and the guide rail 300 is not an "orthodontic force" or "corrective force," and it does not exert a clinically significant force on the teeth. The two ends of the guide rail 300 are fixed to the teeth or gums that do not move, and the shape of the guide rail 300 is set according to the path that the teeth need to move in the orthodontic plan. The shell-shaped orthodontic appliance 200 encloses multiple teeth and applies the elastic force generated by its deformation to multiple teeth, causing the teeth equipped with the dental orthodontic auxiliary device 100 to move to a preset position along the trajectory set by the guide rail 300. That is to say, the sliding channel 130 of the dental orthodontic auxiliary device 100 has a structure that allows the teeth equipped with the dental orthodontic auxiliary device 100 to slide along the guide rail 300 passing through the sliding channel 130 along a predetermined trajectory under the action of the corrective force.

[0044] In some embodiments, the sliding channel 130 and the retention portion 120 are spaced apart along the long axis of the tooth. This structure allows the shell-shaped orthodontic appliance 200 to cover as much of the tooth's outer surface as possible, improving the control the shell-shaped orthodontic appliance 200 exerts on the teeth clinically. This results in better fixation of the shell-shaped orthodontic appliance 200 to the teeth, creating a more secure and comfortable fit. It also prevents the shell-shaped orthodontic appliance 200 from shifting or falling out due to friction between the teeth and the appliance. The outer contour of the retention portion 120 is circular, semi-circular, polygonal, or a combination of these shapes. The outer contour of the retention portion 120 is symmetrically arranged along the clinical crown long axis, ensuring that the dental orthodontic auxiliary device 100, when used in conjunction with the shell-shaped orthodontic appliance 200, does not alter the magnitude and direction of the force applied by the shell-shaped orthodontic appliance 200 to the teeth.

[0045] In other embodiments, reference is made to... Figure 4 and Figure 5 The base 110 protrudes distally from the gingival end to form a support 150 for the sliding channel 130, and the sliding channel 130 extends through the support 150 in a mesiodistal direction. The support 150 and the base 110 are integrally formed or are separate structures fixed together; preferably, they are integrally formed. The retention portion 120 and the support 150 are spaced apart along the long axis of the tooth. A groove 160 is provided between the retention portion 120 and the support 150 in the long axis of the tooth. (Reference) Figure 6 As shown, the length L1 of the dental orthodontic auxiliary device 100 along the long axis of the tooth is set to 3mm to 5mm, preferably 3.5mm to 4mm. The length L2 of the retention portion 120 along the long axis of the tooth accounts for 20% to 50% of the length L1 of the dental orthodontic auxiliary device 100 along the long axis of the tooth. Specifically, the length L2 of the retention portion 120 along the long axis of the tooth is set to 0.7mm to 2mm, preferably 1mm to 1.5mm. The length L3 of the groove 160 along the long axis of the tooth accounts for 20% to 40% of the length L1 of the dental orthodontic auxiliary device 100 along the long axis of the tooth. Specifically, the length L3 of the groove 160 along the long axis of the tooth is set to 0.7mm to 1.6mm, preferably 1mm to 1.2mm. The length L4 of the carrier 150 along the long axis of the tooth accounts for 20% to 50% of the length of the dental orthodontic auxiliary device 100 along the long axis of the tooth. Specifically, the length L4 of the carrier 150 on the long axis of the tooth is set to 0.7mm to 2mm, and preferably L4 can be set to 1mm to 1.5mm.

[0046] In some embodiments, the base 110 is provided with a traction portion 140 near the gingival end, the traction portion 140 being formed by the base 110 extending outward in the mesiodistal direction and / or the long axis direction of the tooth, as shown in the reference. Figure 4 or Figure 5 As shown in the embodiment, the traction portion is formed by the carrier 150 extending outward in the mesiodistal direction and / or the long axis direction of the tooth. (See reference...) Figure 6 and Figure 7 The traction portion 140 is positioned beyond the progingival edge of the dental orthodontic auxiliary device 100 along the long axis of the tooth. The length L6 of the traction portion 140 in the mesiodistal direction is greater than the length L5 of the dental orthodontic auxiliary device 100 in the mesiodistal direction. The traction portion 140 is used in conjunction with ligatures or rubber chains for intermaxillary / intramaxillary traction. It can also be used to fix the relative position of teeth in the labial / buccal-lingual direction, or to fasten several adjacent teeth together as a whole. It can also be used when multiple teeth need to be fastened together as a whole for anchorage.

[0047] Please see Figure 8 and Figure 9 This application also provides a shell-shaped orthodontic appliance 200, used in conjunction with the dental orthodontic auxiliary device 100 in any of the above embodiments. The shell-shaped orthodontic appliance 200 includes a receiving cavity for accommodating multiple teeth, of which at least two teeth are fitted with the dental orthodontic auxiliary device 100. The receiving cavity includes a first receiving cavity for accommodating the multiple teeth without the dental orthodontic auxiliary device 100, and a second receiving cavity for accommodating the multiple teeth with the dental orthodontic auxiliary device 100. The second receiving cavity at least partially encloses the retention portion 120. The receiving cavity has a geometric structure that positions the multiple teeth from a first position to a second position. When the dental orthodontic auxiliary device 100 is used as described above... Figure 2 As shown in the diagram, the second receiving cavity encloses at least a portion of the retention portion 120. Preferably, the second receiving cavity encloses five outer surfaces of the retention portion 120. The first and / or second receiving cavities of all shell-shaped dental appliances of the present invention can be designed and shaped according to the orthodontic scheme to help apply orthodontic forces to the teeth or dentition that need to be moved, so as to ensure that one or more teeth can be moved as desired when closing interdental spaces. When the dental orthodontic aid 100 as... Figure 4 or Figure 5As shown in the diagram, the second receiving cavity encloses the retention portion 120 and at least a portion of the groove 160. In some of the embodiments described above, the shell-shaped dental appliance 200 contacts at least one surface of the retention portion 120 of the dental orthodontic aid 100 to form a retention force. Preferably, the shell-shaped dental appliance 200 contacts both proximal and distal surfaces of the retention portion 120 to generate a force. Furthermore, when the dental orthodontic aid 100 is not used in conjunction with the guide rail 300 and is used alone as an accessory, the shell-shaped dental appliance 200 can be contacted with different surfaces of the retention portion 120 to generate the required orthodontic force, depending on the orthodontic needs.

[0048] This application also provides a dental instrument, including a shell-shaped orthodontic appliance 200 and a dental orthodontic auxiliary device 100 in any of the above embodiments. The shell-shaped orthodontic appliance 200 includes a receiving cavity for accommodating multiple teeth, at least two of which are fitted with the dental orthodontic auxiliary device 100. The receiving cavity includes a first receiving cavity for accommodating the multiple teeth without the dental orthodontic auxiliary device 100 and a second receiving cavity for accommodating the multiple teeth with the dental orthodontic auxiliary device 100. The second receiving cavity at least partially encloses the retention portion 120. The receiving cavity has a geometric structure for positioning the multiple teeth from a first position to a second position. The teeth fitted with the dental orthodontic auxiliary device 100 move along the guide rail 300 to a target position according to a predetermined trajectory under the action of orthodontic force. Specifically, the second receiving cavity on the shell-shaped orthodontic appliance 200 encloses the retention portion 120 or the retention portion 120 and the groove 160, allowing the dental orthodontic auxiliary device 100 to work in conjunction with the shell-shaped orthodontic appliance 200. The interaction between the dental orthodontic auxiliary device 100 and the shell-shaped orthodontic appliance 200 provides retention and does not generate clinical corrective force, simplifying the biomechanical system during treatment and ensuring that tooth movement better meets treatment expectations. Under the corrective force of the shell-shaped dental appliance 200, adjacent teeth to missing teeth move along the predetermined trajectory of the guide rail 300 in a predetermined direction.

[0049] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dental treatment assisting device for use with a shell-shaped dental appliance, characterized in that: The dental auxiliary device comprises a base, a retaining portion and a sliding channel, the retaining portion is arranged on the distal side of the base, the base is protruded to the distal side at the distal gingival end to form the retaining portion, the retaining portion and the base are integrally formed or are fixed as a whole, the sliding channel penetrates the base along the mesial-distal direction, the retaining portion is at least partially wrapped by the shell-shaped dental appliance to retain the shell-shaped dental appliance and the tooth, the sliding channel is in clearance fit with the guide rail along which the tooth equipped with the dental auxiliary device slides according to the predetermined trajectory under the action of the orthodontic force, and the clearance fit has the constraint for the sliding of the sliding channel along the guide rail according to the predetermined trajectory.

2. The dental treatment aid of claim 1, wherein The sliding channel is arranged at the proximal gingival end of the base.

3. The dental treatment aid of claim 1, wherein, The cross section of the sliding channel along the tooth long axis direction is circular or polygonal.

4. The dental treatment aid of claim 1, wherein, The cross section of the guide rail along the tooth long axis direction is circular or polygonal.

5. The dental treatment aid of claim 1, wherein, The cross section of the sliding channel along the tooth long axis direction is substantially consistent with the cross section of the guide rail along the tooth long axis direction.

6. The dental treatment aid of claim 1, wherein, The cross section of the sliding channel along the tooth long axis direction is not consistent with the cross section of the guide rail along the tooth long axis direction.

7. The dental treatment aid of claim 1, wherein, The outer contour shape of the retaining portion is one of circular, semi-circular, polygonal or a combination of the above shapes.

8. The dental treatment aid of claim 1, wherein, The length of the retaining portion along the tooth long axis direction accounts for 20% to 50% of the length of the dental auxiliary device along the tooth long axis direction.

9. The dental treatment aid of claim 1, wherein, The base is protruded to the distal side at the proximal gingival end to form a bearing body of the sliding channel, and the sliding channel penetrates the bearing body along the mesial-distal direction.

10. The dental treatment aid of claim 9, wherein, The retaining portion and the bearing body are arranged at a distance along the tooth long axis direction.

11. The dental treatment aid of claim 10, wherein, The retaining portion and the bearing body are provided with a groove between them along the tooth long axis direction.

12. The dental treatment aid of claim 11, wherein, The length of the groove along the tooth long axis direction accounts for 20% to 40% of the length of the dental auxiliary device along the tooth long axis direction.

13. The dental treatment aid of claim 1, wherein, The proximal gingival end of the base is provided with a traction portion formed by the extension of the base along the mesial-distal direction and / or the tooth long axis direction.

14. A shell-like dental appliance, characterized in that, The dental auxiliary device is used in cooperation with the dental auxiliary device of any one of claims 1-8, and comprises a receiving cavity accommodating a plurality of teeth, at least two of which are equipped with the dental auxiliary device, the receiving cavity comprises a first receiving cavity accommodating the plurality of teeth not equipped with the dental auxiliary device, and a second receiving cavity accommodating the plurality of teeth equipped with the dental auxiliary device, the second receiving cavity at least partially wraps the retaining portion, and the receiving cavity has a geometric structure for positioning the plurality of teeth from a first position to a second position.

15. A shell-like dental appliance, characterized in that, A dental treatment aid as claimed in any one of claims 11 or 12, in combination with a dental treatment aid, comprising a receiving cavity for receiving a plurality of teeth, at least two of which are fitted with the dental treatment aid, the receiving cavity comprising a first receiving cavity for receiving the plurality of teeth not fitted with the dental treatment aid, and a second receiving cavity for receiving the plurality of teeth fitted with the dental treatment aid, the second receiving cavity at least partially enveloping the retention portion and the slot, the receiving cavity having a geometry for positioning the plurality of teeth from a first position to a second position.

16. A dental instrument, characterized by A dental treatment aid as claimed in any one of claims 1 to 13, in combination with a shell-like dental appliance, the shell-like dental appliance comprising a receiving cavity for receiving a plurality of teeth, at least two of which are fitted with the dental treatment aid, the receiving cavity comprising a first receiving cavity for receiving the plurality of teeth not fitted with the dental treatment aid, and a second receiving cavity for receiving the plurality of teeth fitted with the dental treatment aid, the second receiving cavity at least partially enveloping the retention portion, the receiving cavity having a geometry for positioning the plurality of teeth from a first position to a second position; wherein the teeth fitted with the dental treatment aid move along the guide according to a predetermined trajectory to a target position under the influence of a treatment force.

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