DENTAL IMPLANT SYSTEM

Description

[0001] The present invention relates to an implant system.

[0002] The present solution also relates to a method for defining a restoration of a given tooth of a patient, which is not part of the invention.

[0003] A dental implant is typically used to replace a missing or previously removed tooth. Inserting such an implant requires a series of surgical steps to implant an artificial tooth.

[0004] The implant is placed in the alveolar bone of the jaw where the tooth was removed. This implant is made of a biocompatible material to replace the damaged tooth root. This biocompatible material may include a titanium-based alloy, zirconium dioxide, or a polymer such as polyetheretherketone (commonly referred to as "PEEK").

[0005] However, the hardness of the alveolar bone at the implantation area is not known and may vary between individuals or the position of the removed tooth.

[0006] Document EP2497441A1 is known, proposing a system comprising at least two implants. Both implants have a body of the same diameter, but the depth of the thread turns is different for each implant. The surgeon can thus choose the appropriate implant depending on the hardness of the bone. Document US20160022384 similarly discloses implants all comprising the same body, which is close to the teaching of document EP2497441A1. Document RU2262324 also describes different implants.

[0007] However, these systems have drawbacks. In particular, varying the depth of the coils alone does not guarantee sufficient implant stability, especially if the alveolar bone is less hard than expected.

[0008] The aim of the invention is to provide an implant solution that overcomes the above drawbacks and improves the implant systems known from the prior art. In particular, the invention makes it possible to produce an implant system that, once mounted, has sufficient stability regardless of the hardness of the alveolar bone.

[0009] According to a first aspect which is not part of the invention, a solution relates to a method for defining a dental restoration for the replacement of a given tooth of a patient. Said method comprises a step of selecting an implant according to the bone density present at the level of the given tooth, from at least two implants having a main body of substantially the same diameter at the level of their neck and of different diameter on at least one cross-section in the lower part of the implant.

[0010] Advantageously, the main bodies of these implants comprise a thread, and the maximum diameter of the threads, in particular of the turns, of said thread is greater than said diameter of the neck of the implant or the diameter of said main body at the neck.

[0011] In one embodiment, the at least two implants comprise different threads, the depth and / or pitch of which is different.

[0012] In one embodiment, the diameter of the at least one cross-section in the lower part, the depth of the threads and / or the pitch of the threads of a first implant are respectively less than the diameter of the at least one same cross-section in the lower part, the depth of the threads and / or the pitch of the threads of a second implant.

[0013] In one embodiment, the selection step comprises selecting an implant from three implants having a main body of substantially the same diameter at their neck and of different diameter in the lower part, as follows: for a hard bone, choosing a first implant comprising a first diameter on at least one cross-section in the lower part and a thread comprising a first pitch and a first depth; for a medium-density bone, choosing a second implant comprising a second diameter greater than the first diameter on the at least one section in the lower part, and a thread comprising a second pitch and a second depth, said second pitch and / or the second depth being respectively greater than said first pitch and / or said first depth; for a soft bone, choosing a third implant comprising a third diameter greater than the second diameter on the at least one section in the lower part, and a thread comprising a third pitch and a third depth, said third pitch and / or the third depth being respectively greater than said second pitch and / or said second depth.

[0014] In one embodiment, the main body of the at least two implants has one or more conical parts of different conicity and / or a main body of area section decreasing longitudinally from an upper zone towards its lower end.

[0015] The invention relates to an implant system comprising at least two implants intended for replacing the same given tooth of a patient during a dental restoration, chosen according to the bone density present at the level of the tooth to be restored, said at least two implants having a body, constituting a central stem of the implants, substantially of the same diameter at the level of their neck and of different diameter on at least one cross-section in the lower part of the implant. The at least two implants comprise threads, and the maximum diameter of the thread of each implant is greater than said diameter at the level of their neck.

[0016] In one embodiment, the at least two implants comprise different threads, in particular of different depth and / or pitch.

[0017] In one embodiment, the diameter of the at least one cross-section in the lower part, and the depth of the threads and / or the pitch of the threads, of a first implant are respectively less than the diameter of the at least one same cross-section in the lower part, and the depth of the turns and / or the pitch of the threads, of a second implant.

[0018] In one embodiment, the implant system comprises three implants having a main body of substantially the same diameter at their neck and of different diameter at at least one cross-section in the lower portion. Said three implants comprise: a first implant comprising a first diameter at at least one cross-section in the lower part and a thread comprising a first pitch and a first depth; a second implant comprising a second diameter at at least one same cross-section in the lower part greater than the first diameter, and a thread comprising a second pitch and a second depth, said second pitch and / or the second depth being respectively greater than said first pitch and / or said first depth; a third implant comprising a third diameter at at least one cross-section in the lower part greater than the second diameter, and a thread comprising a third pitch and a third depth, said third pitch and / or the third depth being respectively greater than said second pitch and / or said second depth.

[0019] In one embodiment, the main body of the at least two implants has one or more conical portions of different conicity and / or the main body of the at least two implants has a cross-section of area decreasing longitudinally from an upper area towards its lower end.

[0020] In one embodiment, each of the main bodies of the at least two implants further comprises an entry guide portion extending from a lower end of the main body, this guide portion comprising a hemispherical portion.

[0021] In one embodiment, each of the main bodies of the at least two implants includes at least one cutting edge portion disposed in the thread and extending obliquely toward the entry guide portion along a circumferential direction of the body.

[0022] In one embodiment, the neck of the at least two implants includes a beveled portion at an upper end.

[0023] In one embodiment, the beveled portion has a rough outer surface, in particular obtained by sandblasting.

[0024] In one embodiment, each implant includes an identical connecting portion for receiving a portion of an abutment for attachment to the implant.

[0025] According to a third aspect, the invention finally relates to a characterized restoration assembly comprising an implant system according to the second aspect of the invention and further comprising an implant screw and an abutment, the implant screw being capable of fixing said abutment on each implant of said implant system. The attached figures represent, by way of example, an embodiment of an implant of an implant system according to the invention. The figures 1A et 1B represent a first implant according to an embodiment of the invention. The figure 2 is a perspective view of the first implant according to an embodiment comprising a portion of oblique cutting edges. The figure 3 represents three implants according to the invention whose upper diameters are equal and whose lower diameters are different. The figure 4 is a perspective view of a first implant according to an embodiment of the invention comprising a connecting portion from an upper end of the body. The figure 5 is a top view of a first implant according to an embodiment of the invention comprising a hollowed upper portion. The figure 6A represents a first implant system comprising a first implant according to a mode of the invention and an abutment of the implant system. The figure 6B is a cross-sectional view of the first implant system. The figure 7A is an exploded view of the first implant system. The figure 7B is an exploded and sectional view of the first implant system.

[0026] The terms "inferior" and "superior" here refer to the situation in which the fixation system is implanted. A superior portion refers to a portion closer to the part of the implant that is outside the alveolar bone and a inferior portion refers to a portion closer to the point of the implant intended to be implanted first into the alveolar bone. The longitudinal direction will be defined according to the length of an implant, from its upper end to its lower end. The transverse direction is defined as a direction perpendicular to the longitudinal direction.

[0027] The term "neck" refers to the upper portion of the implant body, above the main body. More generally, the neck refers to the portion of larger diameter arranged at the upper end of an implant. In one embodiment, the "neck" refers to the portion of larger diameter below a beveled portion or any other shape arranged at the upper end of an implant. The neck is therefore advantageously positioned in the upper, threadless area of ​​an implant.

[0028] By "conical shape" is meant a portion having a substantially circular section and whose diameter decreases, preferably linearly, in one direction.

[0029] According to the embodiment of the invention, the invention consists of an implant system 1 comprising at least two implants whose diameter at the upper point, in particular at their neck, is the same and whose diameter at a lower portion is different. In an implant system, all the implants are intended for the dental restoration of the same given tooth, the choice of the implant being made according to the bone density present at the level of said tooth to be restored. This implant system advantageously comprises two or three implants, optionally four or more. Naturally, several implant systems are provided to correspond to different teeth to be restored, advantageously in a manner adapted to the restoration of all the teeth.

[0030] An example of an implant 1 is described below with reference to figures 1A et 1B .

[0031] The first implant 1 comprises a first body 2. The first body 2 constitutes a central rod of the implant 1. This body 2 forms the main body of the implant, and will be indifferently called "body" or "main body", it occupies the largest length and volume. It is completed by mainly two upper and lower portions of specific geometry at its ends, and by a thread on its periphery. The body is therefore considered by ignoring the thread which is added on its periphery.

[0032] The implant 1 is designed to be inserted into the alveolar bone of the jaw after a hole has been previously drilled therein. The first implant 1 is preferably made of titanium, a titanium-based alloy, or another biocompatible alloy. The first implant 1 may also be made of zirconium dioxide, a zirconium dioxide-based alloy, or a polymer such as polyetheretherketone.

[0033] The outer part of the main body has a conical-shaped portion from an upper point 3' to a lower point 3". The body has a diameter, measured on a section by a transverse plane, decreasing on said portion towards the lower point 3". The conical shape makes it easier to insert the implant 1 into the bone and provides better stability to the implant 1 in the bone.

[0034] In one embodiment, the implant 1 has a diameter that changes in a decreasing or strictly decreasing manner from the upper point 3' towards the lower point 3". By "strictly decreasing", it is meant here that the implant does not include a sub-portion on which the diameter of the body is constant along the axis A and does not include a sub-portion on which the diameter of the body is increasing towards the lower part along the axis A between the upper point 3' and the lower point 3". Thus, the main body 2 may have a conical shape, by a single cone or by several conical portions. Alternatively, the main body 2 could have any different shape, preferably having a decreasing area section towards its lower part.This section is preferably circular, but could alternatively have another shape: we will use in all cases for reasons of simplicity the term diameter to designate the dimension of this section, in which case this diameter would be that of the smallest circle in which the cross-section of the main body would be inscribed if this section is not circular. As a note, this cross-section of the main body of the implant is considered as the cross-section of the implant ignoring a thread, according to the definition specified above of the main body.

[0035] As illustrated by the figure 1A , the first implant 1 comprises a first body 2, a first threaded portion 8 arranged on at least a portion of the outer surface of the first body 2 in a helical shape. The first implant may comprise an entry guide portion 4 arranged on the lower portion of the first body 2. The threaded portion comprises a plurality of turns or threads making it possible to increase the stability of the implant and to prevent its removal by longitudinal translation.

[0036] As shown in dotted lines on the figure 1A , the first body 2 has a conical portion such that the diameter of the body 2 decreases in the direction of the entry guide part 4 (towards the lower end along the longitudinal axis A of the implant).

[0037] In one embodiment, the diameter of the body on the tapered portion is linear or substantially linear. In an alternative embodiment not shown, the diameter of the body changes non-linearly on the tapered portion.

[0038] In one embodiment, the tapered portion comprises a slope angle varying from about 3° to about 20°. Preferably, the slope angle is about 10°. The slope angle is preferably constant along the tapered portion.

[0039] By "slope angle" we mean here the angle formed by an axis 7 oriented towards the lower point 3" following the imaginary contour of the conical part 3 and the longitudinal axis A of the body of the implant.

[0040] The slope angle is used to define the taper of the conical portion.

[0041] According to another embodiment, the main body 2 does not comprise a conical shape.

[0042] As illustrated in the figure 2 , the first implant 1 comprises at least one portion of cutting edges 5 arranged in the threaded part 8. This portion of cutting edges 5 preferably extends obliquely downwards along a circumferential direction of the body. The portion of cutting edges 5 therefore has an angle with the longitudinal axis A of the body of the implant 1. This angle can vary from approximately 10° to approximately 30°. Preferably, this angle is approximately 20°.

[0043] The portion of cutting edges 5 is produced by at least one recess 51 on a series of adjacent turns. The oblique direction is therefore defined by the axis 52 connecting these recesses 51.

[0044] The at least one recess 51 is designed to form at least one sharp edge on the edge of the coil or on the edge of the thread. This at least one sharp edge advantageously allows the first implant 1 to be more easily implanted in the alveolar bone.

[0045] To form a portion of oblique cutting edges 5, each recess 51 is angularly offset with the recess 51 of the adjacent turn. Preferably, the angular offset of the recess 51 between each adjacent turn is designed to form a portion of cutting edges 5 in a rectilinear circumferential direction 52.

[0046] This portion of cutting edges 5 makes it easier to insert and penetrate the implant 1 into the alveolar bone when said implant 1 is rotated.

[0047] The body 2 of the implant 1 may comprise several portions of cutting edges 5. In this embodiment, the several portions of cutting edges 5 may be approximately regularly spaced radially around the longitudinal direction of the body 2.

[0048] In a first example, the body 2 comprises two portions of cutting edges 5 spaced 180° apart around the longitudinal direction of the body 2. In a second example, the body 2 comprises three portions of cutting edges 5 spaced 120° apart around the longitudinal direction of the body 2. In a third example, the body 2 comprises four portions of cutting edges 5 spaced 90° apart around the longitudinal direction of the body 2.

[0049] In one embodiment, the body 2 comprises an even number of cutting edge portions 5. The two even number of cutting edge portions 5 are arranged in opposite positions.

[0050] The entry guide portion 4 is arranged to extend upwardly from a lower end of the implant. According to this embodiment, the main body 2 comprises at the lower point 3" forming its lower limit an interface with the upper part of the entry guide portion 4. In this way, the entry guide portion 4 guides the body 2 during implantation of the implant 1.

[0051] The inlet guide part 4, as shown in the figure 1A and the figure 2 , advantageously comprises a curved portion. The guide part 4 may comprise a curved portion extending over its entire height.

[0052] Preferably, the curved portion comprises a portion of ellipsoidal, hemispherical shape or of the shape of a portion of a sphere. This ellipsoidal or hemispherical portion is oriented towards the lower direction so as to facilitate the insertion of the implant.

[0053] In one embodiment, the inlet guide portion 4 is adjacent to the threaded portion 8. In an alternative embodiment, the threaded portion 8 and the inlet guide portion 4 overlap. The inlet guide portion 4 then comprises at least a portion of the thread of the threaded portion 8.

[0054] The entry guide part 4 can be produced as a part integral with the body 2 of the implant 1.

[0055] The threaded portion 8 comprises a thread or a succession of threads. The threaded portion may comprise at least the conical portion or a part of the conical portion.

[0056] On the other hand, the body 2 of the implant 1 may comprise a beveled portion 6 at its upper end. The beveled portion 6 is arranged on the edge of the upper side of the body 2. The beveled portion 6 has a sloping surface so as to increase the contact surface with the alveolar bone and to increase the strength of the fixation.

[0057] In addition, the diameter of the beveled portion 6 reduces towards the upper end of the implant 1, to allow the implant 1 to be difficult to detach from the alveolar bone without the intervention of a surgeon.

[0058] The angle between the surface of the beveled portion 6 and the longitudinal axis of the body A of the implant can vary between approximately 30° and approximately 65°.

[0059] Preferably, the outer surface 62 of the beveled portion 6 designed to be in contact with the alveolar bone present is a rough surface. Said rough outer surface 62 is preferably obtained by a sandblasting operation. The roughness Ra of said outer surface can vary from approximately 1 to 2 µm, preferably approximately 1.4 µm. By "roughness Ra" is meant here the average of the absolute values ​​of the deviations between the profile and a mean line of this profile.

[0060] As illustrated on the figures 4 et 5 , the implant 1 comprises a means for cooperating with a pillar 14 which will serve as a base for the installation of an artificial tooth.

[0061] The implant 1 comprises a connecting part 9 arranged from an upper end of the body 2 to a predetermined depth.

[0062] This connection part 9 is intended to receive a part of an abutment 14 for its attachment to the implant 1 as illustrated by the figure 6A .

[0063] The connecting part 9 comprises a first surface 61 on the upper end of the implant 1.

[0064] The connecting part 9 comprises a first recess portion 63, a cooperation means 10 and a second recess portion 64.

[0065] The first recess portion 63 extends from the first surface 61 to the cooperation means 10. Preferably, the first recess portion is cone-shaped.

[0066] The second recess portion 64 extends from the cooperation means 10 towards the lower part of the implant 1. The second recess portion 64 may comprise a thread capable of receiving a screw 15.

[0067] The cooperation means 10 allows cooperation with a cooperation means 10' of the pillar 14. As illustrated in the figure 5 , the cooperation means 10 can form a hexagon.

[0068] An example of a restoration assembly comprising implant 1, abutment 14 and implant screw 15 is described below with reference to figures 6A à 7B .

[0069] As illustrated in the figure 7A , the pillar 14 comprises a pillar body 16. The pillar body comprises, at one of its longitudinal ends, a cooperation means 10' capable of cooperating with the cooperation means 10 of the implant. The cooperation means 10' is preferably hexagonal in shape. The pillar may comprise a stop 17 for abutting against the first recess portion 63 of the implant 1. The stop is designed so as to stop the movement of the pillar 14 during its insertion into the implant 1. The stop 17 may be cone-shaped.

[0070] When inserting the abutment 14, the abutment engagement means 10' is inserted into the implant engagement means 10 until the stop 17 meets the first recess portion 63 of the implant 1.

[0071] The cooperation between pillar 14 and implant 1 thus makes it possible to block pillar 14 in rotation as well as in translation towards the lower direction.

[0072] Preferably, the pillar body 16 is tubular. The tubular pillar body may comprise a thread 66 in its inner surface. The thread is preferably arranged near the cooperation means 10' or the cone 17.

[0073] The tubular abutment body 16 allows penetration of an implant screw 15 through the abutment 14 and through the second recess portion 64 of the implant 1.

[0074] As illustrated on the figures 6B et 7B , the implant screw 15 is designed to be inserted into the second recess portion 64 of the implant 1 through the tubing of the abutment 14. The implant screw comprises a thread 65 capable of cooperating with the tapping of the second recess portion 64 and with the tapping 66 of the abutment.

[0075] Once the implant is implanted, the abutment 14 is therefore inserted into the first recess portion 63 of the implant so that the cooperation means cooperate together. In a further step, the screw 15 is screwed into the threads of the abutment 14 and the implant 1 as illustrated figure 6B .

[0076] The screw ensures the tightening and solidarity of the fixation between pillar 14 and implant 1.

[0077] As illustrated by the figure 1B , the first implant 1 comprises a first diameter D11 at the neck of the implant, i.e. at the upper point 3' of the main body (at the junction between the beveled part 6 and the conical portion). The diameter at the upper point D11 is the diameter at the neck of the implant.

[0078] Likewise, the body of the first implant 1 comprises a second diameter D12 at the lower point 3" of the main body 2, particularly at the lower limit of the conical part forming the main body.

[0079] D13 is also the depth of the thread 8. Said depth D13 of the thread is measured from the implant body 2 to the radial end of the thread, i.e. in the transverse direction. Thus, the diameter of the thread corresponds to the sum of the diameter of the implant body 2 and twice said depth of the thread.

[0080] Finally, we note p1 the pitch of the thread of implant 1 (i.e. the distance between two adjacent turns, in a substantially longitudinal direction).

[0081] The implant system 1 according to the described embodiment comprises a first implant 1 as described above and at least one second implant 12.

[0082] As illustrated in the figure 3 , the second implant 12 comprises the same first upper diameter as the first implant 1, or approximately the same first upper diameter, that is to say substantially the same diameter in the upper part of the main body, at the neck, but the second diameter D22 of the second implant 12 is different from the second diameter D12 of the first implant 1, that is to say that the two main bodies of each of the two implants comprise a different diameter at their lower part, in particular at their lower end.

[0083] The second implant 12 comprises a second body, a second threaded portion, a second conical portion and preferably a second entry guide portion.

[0084] The second implant 12 may also include a second cutting edge portion disposed in the second threaded portion and extending obliquely downward along a circumferential direction of the body.

[0085] The diameter at the upper point D11 of the first conical portion is substantially identical to the diameter at the upper point D21 of the second conical portion.

[0086] By “substantially identical” is meant here equal to or equal to plus or minus 2%.

[0087] However, the diameter at the lower point D12 of the conical portion is different from the diameter D22 at the lower point of the second conical portion.

[0088] By different, we mean different by at least 4%, or even at least 5%. As a side note, alternatively, it should be noted that the variation in dimension is greater in the lower part of the main body of the implant than in the upper part.

[0089] Preferably, the diameter D12 at the lower point of the main body of the first implant is smaller than the diameter D22 at the lower point of the main body of the second implant. The second implant 12, by its larger diameter at the lower point, advantageously allows the alveolar bone to be condensed during its implantation. The condensation of the alveolar bone in contact with the implant makes it possible to increase the local hardness of the alveolar bone and improves the primary stability of the implant. This larger diameter is thus particularly suitable for less dense bone.

[0090] In one embodiment, the depth D13 of the thread of the first threaded portion is also different from the depth D23 of the thread of the second threaded portion. Indeed, the depth D13 of the first threaded portion is smaller than the depth D23 of the thread of the second threaded portion.

[0091] Furthermore, the pitch p1 between two threads of the first implant 1 is preferably smaller than the pitch p2 of the second implant 12.

[0092] The second implant 12, with its depth D23 and its pitch p2 between two threads, advantageously allows the thread and the coils to anchor more optimally in a softer alveolar bone by leaving more space for the bone. In fact, the softer alveolar bone includes larger alveoli than the alveoli of a denser alveolar bone. Thus, the larger alveoli are easier to keep in the middle of the coils if these coils are deeper and more spaced apart from each other.

[0093] The difference in taper and / or diameter at the lower point of the tapered portion allows the lower portion of the second implant 12 to further compact the alveolar bone and thus provide greater stability to the second implant 12.

[0094] The greater depth of turns and the greater pitch between the threads allow a wider attachment of the second implant 12 and therefore better stability.

[0095] The first implant 1 is therefore suitable for implantation in harder and / or denser alveolar bone when the second implant 12 is more suitable for implantation in less hard and / or less dense alveolar bone.

[0096] The two implants comprise main bodies whose cross-section evolves continuously in the longitudinal direction. The fact of having a larger diameter of at least one cross-section in the lower part of the second implant compared to the same cross-section of the first implant allows the second implant to have an overall larger volume in this portion surrounding this cross-section, and to be more adapted to a less hard bone. According to one embodiment, the cross-section of the main bodies decreases over their entire longitudinal length, and this cross-section in the lower part can be considered on any part of the lower half of the main bodies, and in particular at its lower end (at the lower point).

[0097] Naturally, as a variant, the second implant could only comprise a different diameter in the lower part and a substantially identical thread.

[0098] As an additional remark, each implant comprises a thread such that the largest diameter of its turns is greater than the diameter of the neck. Due to their geometries described above, this largest diameter is located in the upper part of the thread, and therefore close to the neck of the implant. This construction allows stability of the implant by satisfactory anchoring via its threads, and not by support of the neck on the cortical bone which would have the effect of overloading this cortical bone. In the embodiments, the depth of the turns is significant, so that the diameter of several turns, for example two, or at least two, or three, or more than three consecutive turns, is greater than the diameter of the neck.

[0099] As an additional remark, the diameter of the coil(s) positioned near the lower part is also advantageously greater than the diameter of this lower part.

[0100] In one embodiment, the implant system 1 comprises a first implant 1, a second implant 12 and a third implant 13, this third implant being suitable for even softer and / or even less dense alveolar bones.

[0101] As illustrated in the figure 3 , the third implant 13 comprises a first diameter D31 substantially equal to the first diameters D21 and D11, but the second diameter D32 of the third implant 13, in a lower part, is larger than the second diameter D22 of the second implant 12.

[0102] In one embodiment, the depth D33 of the thread of the threaded portion of the third implant 13 is greater than the depth D23 of the thread of the second implant 12. In one embodiment, the pitch p3 between two threads of the third implant 13 is greater than the pitch p2 between two threads of the second implant 12.

[0103] The first implant 1 is therefore more suitable for hard and dense bone. The third implant 13 is therefore more suitable for soft and less dense bone and the second implant 12 is therefore more suitable for bone with intermediate hardness and density.

[0104] All three implants have large diameter coils, at least one of which has a diameter greater than the diameter of the neck.

[0105] The solution also relates to a method of defining a dental restoration for the replacement of a given tooth of a patient.

[0106] The method includes a step of selecting an implant based on the bone density present at the level of the given tooth.

[0107] In one embodiment, the determination or estimation of the bone density present at the given tooth is carried out by a preliminary measurement step.

[0108] The step of selecting an implant is carried out from among at least two implants having a main body of the same diameter at their neck and / or at their upper end and a different diameter at the lower part of the implant. The step of selecting an implant can be carried out from among the implants described above.

[0109] In one embodiment, the taper of the first implant and the second implant is different. The multiple implants may comprise threads of different diameters from one implant to another. As described above, the bottom diameter and the thread diameter and / or the thread depth of a first implant are preferably respectively greater than the bottom diameter and the thread diameter and / or the thread depth of a second implant.

[0110] So, when placing an implant (not claimed), a hole is drilled in the alveolar bone of the jaw using a drill bit (not shown).

[0111] In one embodiment, a step of measuring or estimating the hardness of the alveolar bone can be done before or during drilling. Once the hole is drilled, the surgeon can choose the most suitable implant based on the hardness and density of the alveolar bone. For example, the hardness or density of the alveolar bone can be determined by reading an X-ray of the bone. The hardness or density can then be confirmed by the operator while drilling the bone, based on the force required to drill the alveolar bone. The greater the drilling force, the harder and denser the bone.

[0112] Then, the most suitable implant is inserted into the drilled hole so that the entry guide portion 4 can be inserted smoothly into the drilled hole. The entry guide portion 4 will then follow the drilled hole so that the longitudinal direction of the implant is substantially oriented in the same direction as the longitudinal direction of the drilled hole.

[0113] Once the implantation direction is fixed by the entry guide part 4, the first implant 1 is inserted by screwing or by rotation into the volume of the alveolar bone by rotating the threaded part.

[0114] Subsequently, the abutment 14 can be mounted on the connecting part of the implant inserted into the alveolar bone and the clamping screw 15 can be screwed into the implant through the abutment 14, thus forming a restoration assembly.

[0115] Naturally, the invention is defined in the claims.

[0116] In particular, the main body of the implant may comprise any shape other than a conical shape. This shape comprises an upper part or coronal part (comprising the neck) comprising the same geometry and a lower part or apical part of different geometry, one of the implants comprising a lower part of greater volume than the other, to increase its anchoring in a soft bone. For this, this implant comprises at least one cross-section of greater area at the level of the lower part, or even preferably over an entire portion in the lower part, all of the cross-sections of which have a greater area, relative to the area or areas of the same cross-section(s) of the other implant. At the same time, the thread of this larger volume implant is preferably also increased, particularly its pitch and / or its depth, for optimal anchoring in the bone.Additionally, the length of these main bodies and / or implants is the same.

[0117] Thus, each implant may, for example, comprise a double-conical body, comprising an upper part forming a first conical portion, and a lower part forming a second conical portion different from the first: in this case, the two different implants may comprise the same upper part and different lower parts.

[0118] We have seen that at least two implants with the same diameter at their neck generally have a different diameter at their lower end.

[0119] Additionally, they could present a different volume in the lower part considering any other area of ​​this lower part than the end.

[0120] The thread could also have any other shape than that described above. Advantageously, the thread is spiral-shaped. According to one embodiment, the thread may comprise a double turn to reduce screwing time and heating during screwing. In addition, advantageously, the diameter of at least one turn of the thread, in particular in the upper part of the thread near the neck of the implant, is strictly greater than the diameter of the neck.

[0121] Furthermore, as described, it is advantageous to choose a family of implants with the same diameter greater than at least two implants, or even at least three implants. This family of implants forms a system of implants intended to participate in the restoration of the same tooth, the implant being chosen according to the bone density at the level of the tooth to be restored.

[0122] Advantageously, it is possible to use the following implant systems: a first system of two or three implants having a neck diameter of approximately 3.3 mm, and a lower diameter of approximately 2.2 mm, 2.3 mm and 2.4 mm respectively and a thread of diameters of approximately 3.6, 4.1 and 4.6 mm respectively. a second system having a neck diameter of approximately 4.1 mm, and a lower diameter of approximately 2.2 mm and 2.3 mm respectively and a thread of diameters of approximately 4.6 and 5.3 mm. A third implant may comprise a neck diameter of approximately 4.1 mm, a lower diameter of approximately 2.4 mm respectively and a thread diameter of approximately 6 mm. a third system having a neck diameter of approximately 4.8 mm, and a lower diameter of approximately 2.8 mm and 3 mm respectively and a thread of diameters of approximately 6 and 6.8 mm. A third implant may include a neck diameter of approximately 4.8 mm, a lower diameter of approximately 3.2 mm and a thread diameter of approximately 7.5 mm.

Claims

1. Implant system (11) comprising at least two implants (1, 12) intended for the replacement of a given same tooth of a patient in restorative dentistry, chosen as a function of the bone density present at the tooth to be restored, said at least two implants having a main body, constituting a central rod of the implants, substantially of the same diameter at the neck thereof and of different diameter over at least one cross-section in the lower part of the implant, the at least two implants comprising threads, and the maximum diameter of the thread of each implant being greater than said diameter at the neck thereof.

2. Implant system (11) according to the preceding claim, characterized in that the at least two implants comprise different threads, notably of which the depth and / or the pitch is different.

3. Implant system (11) according to one of the preceding claims, characterized in that the at least two implants comprise different threads and in that the diameter of the at least one cross-section in the lower part, and the depth of the threads and / or the pitch of the threads, of a first implant, are respectively less than the diameter of the at least one cross-section in the lower part, and than the depth of the turns and / or the pitch of the threads, of a second implant.

4. Implant system (11) according to one of the preceding claims, characterized in that it comprises three implants having a main body substantially of the same diameter at the neck thereof and of different diameter at at least one cross-section in the lower part, said three implants being further characterized by: - a first implant comprising a first diameter at at least one cross-section in the lower part and a thread comprising a first pitch and a first depth; - a second implant comprising a second diameter at the at least one same cross-section in the lower part greater than the first diameter, and a thread comprising a second pitch and a second depth, said second pitch and / or the second depth being respectively greater than said first pitch and / or than said first depth; - a third implant comprising a third diameter at at least one cross-section in the lower part greater than the second diameter, and a thread comprising a third pitch and a third depth, said third pitch and / or the third depth being respectively greater than said second pitch and / or than said second depth.

5. Implant system (11) according to one of the preceding claims, characterized in that the main body of the at least two implants has one or more conical parts of different coning and / or in that the main body of the at least two implants has a cross-sectional area that decreases longitudinally from an upper zone to its bottom end.

6. Implant system (11) according to one of the preceding claims, characterized in that each of the main bodies of the at least two implants (1, 12) further comprises an input guiding part (4) extending from a bottom end of the main body, this guiding part (4) comprising a hemispherical portion.

7. Implant system (11) according to one of the preceding claims, characterized in that each of the main bodies of the at least two implants comprises at least one portion of cutting edges (5) disposed in the threading and extending obliquely towards the input guiding portion along a circumferential direction of the body.

8. Implant system (11) according to one of the preceding claims, characterized in that the neck of the at least two implants comprises a bevelled part (6) at a top end.

9. Implant system (11) according to the preceding claim, characterized in that the bevelled part (6) has a rough outer surface (62), notably obtained by blasting.

10. Implant system (11) according to one of the preceding claims, characterized in that each implant comprises an identical connection part (9) intended to receive a part of an abutment (14) for the fixing thereof to the implant (1).

11. Restoration assembly, characterized in that it comprises an implant system according to one of the preceding claims and in that it further comprises an implant screw (15) and a abutment (14), the implant screw (15) being able to fix said abutment (14) to each implant of said implant system.