Connection device and connection system for dental reconstruction on an implant, dental reconstruction on an implant, and method for performing dental reconstruction on an implant

Abstract

The dental reconstruction comprises a connecting device (2) having a first end bearing on the anchor (1) and a second end supporting the prosthesis (3). The cross section decreases between the first end and the second end. The connecting device (2) defines a through hole (9) and an abutment (10). A fastening screw (4) is threaded into the female threaded portion (6) of the anchor (1) to fasten the connecting device (2). A blocker (11) has a cross section that increases when the fastening screw (4) is inserted into the through hole (9). The blocker (11) fits into a groove (12) of the prosthesis (3) that covers the connecting device (2). A screw head (4a) has a circular cross section that is supported on the blocker (11) to deform the blocker (11) and fit the blocker (11) into the groove (12) of the prosthesis (3).

Description

[Technical field]

[0001] The present invention relates to a connection device for a dental restoration on an implant, a connection system, a dental restoration on an implant, and a method for performing a dental restoration on an implant. [Background technology]

[0002] To perform a dental restoration on an implant, it is common practice to fix the implant in the jawbone and then fix the dental prosthesis on the implant, either directly or by means of an abutment. The abutment is an intermediate element that is fixed on the implant and serves the purpose of attaching the dental prosthesis. The abutment is located between the implant and the dental prosthesis. The abutment provides a mechanical connection between the dental prosthesis and the implant, generally in conjunction with an abutment screw. The implant has a threaded inner section on which the prosthesis is fixed. The screw passes through the prosthesis and the abutment and presses the implant, which acts as a fixture for the dental restoration. In the conventional method, the implant has a tap section that allows the dental prosthesis to be fixed directly or indirectly. Various examples of realizing implants are shown in the documents JP 5519985, JP 2018-538014, EP 1943978, EP 2053985, EP 3421004, EP 3777760, WO 2004 / 032786, WO 2013 / 125924, WO 2017 / 121898, U.S. Pat. No. 5,482,463, U.S. Pat. No. 8,033,826, U.S. Pat. No. 8,317,515, U.S. Pat. No. 2011 / 0213425, U.S. Pat. No. 2012 / 301850 and U.S. Pat. No. 2015 / 182309. Document EP 2 480 161 shows an abutment comprising several parts. Documents EP 2 127 612 and US 6,663 388 also show an abutment comprising two parts with a head defining the fixation axis of the prosthesis, which is not collinear with the axis of the implant. Documents US 6,932 606 and US 7,300 283 show an anti-rotation device formed by a deformable arm inserted into a cavity of the abutment.

[0003] Many implant restorations require the use of adhesives or cements to fix the dental prosthesis to the abutment. However, it is particularly advantageous to not use adhesives or cements. Adhesives are not really a reproducible method, especially with regard to the thickness and quality of the adhesive used. Removal of excess in the mouth is often difficult. Furthermore, adhesives are not reversible, resulting in long and laborious work if a stuck restoration needs to be addressed. An adhesive can be applied to the prosthesis outside the mouth (between the prosthesis and the abutment) before the assembly is reinserted into the implant. This is why it is called a screw-retained prosthesis. This construction is not sterile and cannot be autoclaved (134°C).

[0004] If the insertion axis of the prosthesis does not coincide with that of the implant, it is possible to use the above-mentioned abutments. However, this operation can be very difficult with abutments previously attached to a prosthesis that is to be through-fixed in the implant, since adjustments of the contact points of the dental prosthesis must always be made. For example, upgrades made to ceramic prostheses may require a new heating operation, and the adhesive must be removed beforehand by high-temperature heating. Therefore, oxidation and contamination phenomena may be observed on the abutments.

[0005] In the case of prostheses made entirely from machined ceramics and screwed directly onto the implant without adhesive, sealing problems have been observed between the different components of the implant restoration. There is also a poor concentration of forces during the chewing phase on this assembly. This poor distribution of forces, combined with tolerance issues and / or lack of perfect matching of the parts, can lead to the failure of the dental prosthesis or components.

[0006] The connecting device therefore has the advantage that the dimensions of the different components of the implant restoration can be better controlled by using dental prostheses that are through-fixed by screws without the use of adhesives.

[0007] Different configurations of the coupling device on the abutment are shown in the document US 2020 / 0138552. This document shows a coupling device screwed onto the abutment for restorations sealed with cement. This document further describes a dental prosthesis screwed directly onto the abutment without a coupling device. In use, such an embodiment proves to be difficult to use. The document US 10,010,384 shows an abutment with a deformable head and a dental prosthesis. The fixing screw is fitted into the abutment before the assembly is inserted into the prosthesis. The through-fixing screw of the abutment is pre-inserted into the abutment to reduce its size and thus allow the insertion of a screwdriver into the through-hole of the dental prosthesis reduced in size. The dental prosthesis has a groove on its underside that allows the expansion of the head of the abutment by the abutment screw head, thus providing fixation of these two elements. This screw fastens the prosthesis to the implant and prevents the abutment head from reversing so that the prosthesis is firmly fastened to the abutment. The abutment is directly responsible for the blocking of the prosthesis. This configuration complicates the adjustment of the prosthesis contact points, since the connection axis of the abutment, which is identical to the connection axis of the implant, must match the insertion axis of the prosthesis. These axes are often not collinear. Furthermore, the abutment must be fitted into place and removed several times, resulting in the destruction of peri-implant tissue attachments and contamination of the peri-implant tissue.

[0008] Korean Patent Publication No. 10-1943437 presents substantially the same teachings regarding an implant restoration using an abutment fixed in an implant having a tap section. A dental prosthesis in the form of a single tooth is drilled with a through hole designed for a fixation screw to pass through. The dental prosthesis is placed on an abutment which also has a through hole. A fixation screw passes through the dental prosthesis and the abutment. The fixation screw works in conjunction with the tap section of the implant to effect fixation of the dental prosthesis with the implant.

[0009] The abutment and implant have anti-rotation means that prevent rotation of the abutment relative to the implant around the axis of rotation realized by the fixing screw. The abutment has a movable arm in its crown. The fixing screw increases in cross section from its foot to its head so that the movable arm spreads outwards when the fixing screw is attached. The movable arm is inserted into the cavity of the dental prosthesis to form an anti-rotation means between the dental prosthesis and the fixing device. The shape of the head of the fixing screw and the shape of the through hole of the dental prosthesis complement each other to ensure a strong mechanical fixation. The dental prosthesis presses against the abutment which itself presses against the implant.

[0010] A substantially equivalent teaching exists in the document US 2020 / 0015940, which presents an implant fixed in the jawbone, an abutment that is pressed against the implant, and a dental prosthesis that is pressed against the abutment. The dental prosthesis and the abutment each have a through hole. The two through holes extend the tapped portion of the implant. The abutment is fitted to the implant, and then the dental prosthesis is fitted to the abutment before the fixation screw is inserted. The fixation screw increases in cross section from its foot to its head. The head of the abutment is provided with several deformable arms that are inserted into the cavity of the dental prosthesis when fixing the screw to the implant. Fixation of the screw in the implant prevents deformation of the deformable arms and separation between the dental prosthesis and the abutment. In this configuration, there is no coupling device, only the fixation screw blocks the abutment and the fins to fasten the dental prosthesis. This configuration, like the previous example, requires the implant axis to be collinear with the insertion axis of the prosthesis. In practice, this situation is rarely encountered. The axis of the implant is different from the insertion axis of the prosthesis. The fixation screw has a threaded lower end that is attached to a threaded area of ​​the fixation abutment. The fixation screw also has a flared head that acts on the fixation fin on the upper part of the intermediate element and another flared area that comes to rest on a stop on the lower part of the intermediate element. By screwing the fixation screw into the fixation abutment, it presses the lower part of the intermediate element against the fixation abutment, deforming the fin and firmly attaching the prosthesis to the upper part of the intermediate element. Since the screw has a flared head and a similarly flared middle part that rests on the intermediate element, the penetration depth of the screw into the fixation stud determines the pressure that can be applied between the lower part of the intermediate element and the fixation stud, and between the upper part of the intermediate element and the prosthesis. This configuration is difficult to adjust for manufacturing variations in the fixation screw, the prosthesis, the fixation abutment, the lower portion of the intermediate component, and the upper portion of the intermediate component, which can lead to multiple disassembly and reassembly of the prosthesis, the fixation screw, and the intermediate piece.Furthermore, this configuration does not appear to effectively prevent the prosthesis from locking rotationally relative to the fixed abutment.

[0011] The document WO 2018 / 138630 discloses a dental restoration with an implant made of ceramic that receives a deformable connecting element and a dental prosthesis that presses onto the implant. The implant does not have a tap section designed to directly receive a fastening screw, but is designed with a head with an anti-rotation system and a radial groove that receives a deformable bottom part of the connecting element. Both the bottom and the top of the connecting element are provided with deformable arms. The connecting element is clipped onto the implant before the fastening screw is inserted. The dental prosthesis is clipped onto the top of the connecting device. When the fastening screw is tightened onto the tap section, the deformable arms of the connecting device cannot be deformed any further and the dental prosthesis is fixedly fitted onto the implant. This connecting element with an internally threaded insert relates to the assembly of a ceramic dental prosthesis directly onto a ceramic implant without a tap section. From a practical point of view, difficulties in inserting the prosthesis, difficulties in adjusting the contact points and difficulties with respect to the fitting tolerances of the components are present here as well. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Japanese Patent No. 5519985 [Patent Document 2] Special Publication No. 2018-538014 [Patent Document 3] European Patent No. 1943978 [Patent Document 4] European Patent No. 2053985 [Patent Document 5] European Patent No. 3421004 [Patent Document 6] European Patent Application Publication No. 3777760 [Patent Document 7] International Publication No. 2004 / 032786 Brochure [Patent Document 8] International Publication No. 2013 / 125924 Brochure [Patent Document 9] International Publication No. 2017 / 121898 Brochure [Patent Document 10] U.S. Pat. No. 5,482,463 [Patent Document 11] U.S. Pat. No. 8,033,826 [Patent Document 12] U.S. Patent No. 8,317,515 [Patent Document 13] US Patent Application Publication No. 2011 / 0213425 [Patent Document 14] US Patent Application Publication No. 2012 / 301850 [Patent Document 15] US Patent Application Publication No. 2015 / 182309 [Patent Document 16] European Patent No. 2480161 [Patent Document 17] European Patent Application Publication No. 2127612 [Patent Document 18] U.S. Patent No. 6,663,388 [Patent Document 19] U.S. Patent No. 6,932,606 [Patent Document 20] U.S. Patent No. 7,300,283 [Patent Document 21] US Patent Application Publication No. 2020 / 0138552 [Patent Document 22] U.S. Patent No. 10,010,384 [Patent Document 23] Korean Patent No. 10-1943437 [Patent Document 24] US Patent Application Publication No. 2020 / 0015940 [Patent Document 25] International Publication No. 2018 / 138630 Brochure Summary of the Invention

[0013] One object of the present invention is to remedy these drawbacks and, more particularly, to provide a connecting device that exhibits better performance than prior art devices for connecting a dental prosthesis with a fixture.

[0014] These drawbacks tend to be overcome by coupling devices for dental restorations on implants, which: a longitudinally extending body having a foot end and a head end, the body defining a through hole designed to receive a fixation screw and a stop for a screw head of said fixation screw, the through hole expanding from the stop in the direction of the foot region to form a cavity designed to cover the head of a tapped maxillary implant fastener, the body having an outer cross section that decreases from the foot end towards the head end; a body having an outer wall forming an external anti-rotation device extending on opposite sides of the cavity in a direction perpendicular to the longitudinal axis, the body being designed to face the head perpendicular to the longitudinal axis; Equipped with.

[0015] An inner wall of the body defining the cavity forms an internal anti-rotation device configured to prevent rotation of the coupling device relative to the head, the internal anti-rotation device extending from the foot area, the internal anti-rotation device facing the external anti-rotation device perpendicular to the longitudinal axis.

[0016] The blocker is fixed to the body and movably engaged between a retracted position and an extended position, the extended position having an outer cross-section larger than the cross-section of the retracted position, the blocker partially blocks the through hole of the connecting device so as to deform upon contact with the fixation screw, and the blocker is designed to be inserted into a groove or recess of the prosthesis covering the connecting device to fixate the prosthesis on the connecting device in the longitudinal direction.

[0017] According to one aspect of the invention, the blocker is disposed in the upper half of the coupling device and is located between the stopper and the apical end of the body. Preferably, the stopper separates the blocker from the first portion of the external anti-rotation device and / or separates the blocker from the cavity.

[0018] In a preferred method, the blocker is made from a shape memory alloy.

[0019] In certain embodiments, the outer wall of the body is covered by a coating layer made from a compressible polymeric material.

[0020] Advantageously, the outer wall of the body has at least one frustoconical portion.

[0021] It is a further object of the present invention to provide a connection system, particularly for connecting a prosthesis to a fixture, that is more efficient than prior art connection systems.

[0022] This result tends to be achieved by a connection system for a dental restorative prosthesis comprising a connection device according to any one of the configurations and comprising a fixation screw having a head with a circular cross section, the circular cross section deforming the blocker when the screw head is pressing against the stopper, so as to have a constant deformation of the blocker regardless of the depth of insertion of the screw head into the through hole.

[0023] Advantageously, the screw head is completely embedded in the through hole when the screw head presses against the stopper.

[0024] In certain embodiments, the fixation screw has a length that is less than the length of the coupling device, the length being measured along the longitudinal axis.

[0025] Preferentially, the fixture has a head designed to protrude from the gums, the head extends longitudinally and defines a tap portion extending at least partially outside the gums and jawbone, the head has an outer cross-section complementary to an inner cross-section of the cavity, the head and the cavity form a rotation blocker configured to prevent rotation of the connecting device relative to the head about an axis parallel to the longitudinal axis, the fixing screw is threaded into the tap portion and the connecting device is removably fitted to the head.

[0026] In an advantageous manner, the tap portion does not extend beyond the height of the overlap by the connecting device on the fastener.

[0027] In certain embodiments, the coupling device and fastener define a clip device configured to secure the coupling device to the fastener by elastic deformation.

[0028] It is a further object of the present invention to provide a dental restoration that is easier to implement than prior art designs.

[0029] This result tends to be achieved by a dental restoration comprising a connection system according to any one of the above-mentioned configurations and comprising a prosthesis having a through hole opening onto the through hole of the connection device, the through hole of the prosthesis extending from its coronal end to its apical end.

[0030] In an advantageous manner, the fixation screws are free from contact with the prosthesis.

[0031] Preferentially, the prosthesis is free of contact with the fixture.

[0032] It is a further object of the present invention to provide a method for performing dental restorations that is easier to perform than prior art arrangements.

[0033] This result tends to be achieved by a method for making a dental restoration, the method comprising: providing a fixture designed to be fixed on the jawbone of a laboratory model, the fixture having a head designed to project and fit against the gums, the head defining a tap portion that extends at least partially outside the gums and jawbone; Providing a coupling device according to any one of the preceding configurations; providing a prosthesis defining a through hole; inserting a coupling device into the prosthesis and then placing the assembly on the head, the coupling device being located between the head and the prosthesis; Passing a fixation screw through the through-hole of the prosthesis and through-hole of the connecting device; threading the fixation screw into the tapped area until it presses against a stop, the fixation screw fixing the connector onto the abutment or implant and deforming the blocker so that it is inserted into a groove or recess in the prosthesis to fixedly assemble the connector and the prosthesis in a longitudinal direction; removing the fixation screw and detaching the assembly formed by the connector and the prosthesis from the fixture of the laboratory model; adjusting the assembly formed by the connector and the prosthesis in the mouth and then fastening the assembly to a fixture using a fixation screw; Equipped with.

[0034] Other advantages and features will become more clearly apparent from the following description of particular embodiments and implementations of the invention, given for non-restrictive illustrative purposes only and represented in the accompanying drawings, in which: [Brief description of the drawings]

[0035] [Figure 1] FIG. 1 shows a schematic side view of an implant restoration according to a first embodiment; [Diagram 2] 3A and 3B show schematic views of the opposite side of an implant restoration according to a second embodiment; [Diagram 3] 1 shows a schematic exploded view of an implant restoration without a dental prosthesis. [Figure 4] 3 shows diagrammatically a cross-sectional view of an implant restoration according to a third embodiment; [Diagram 5] 13 shows diagrammatically a cross-sectional view of an implant restoration according to a fourth embodiment, directly on a fixture. [Figure 6] 13 shows a schematic cross-sectional view of the apical part of an implant restoration according to a fifth embodiment; [Figure 7] 1 shows a schematic side view of a blocker. [Figure 8] 13 shows a schematic cross-sectional view of the top of an implant restoration according to a sixth embodiment. [Figure 9] 13 shows diagrammatically a cross-sectional view of an implant restoration according to a seventh embodiment; [Figure 10] 13A and 13B are schematic diagrams illustrating a top view of another embodiment of a blocker mated to a coupling device. [Figure 11] 13 shows a schematic cross-sectional view of the apical part of an implant restoration according to an eighth embodiment. [Figure 12] 1 shows a schematic cross-sectional view of the periphery of an implant restoration. [Figure 13] 1 shows a schematic exploded view of another embodiment of an implant restoration without a dental prosthesis. [Figure 14a] 13 shows diagrammatically a cross-sectional view of an implant restoration according to a fifth embodiment, directly on a fixture. [Figure 14b] 1 shows a schematic enlarged cross-sectional view of a connection between an implant abutment and a connecting device. [Figure 15] 13 shows diagrammatically a side view of an implant restoration according to a sixth embodiment; [Figure 16a] 1 shows a schematic side view of a coupling device; [Figure 16b] 13 shows diagrammatically a side view of an implant restoration according to a sixth embodiment; [Figure 16c] 1 shows a schematic top view of a blocker. [Figure 17] 13 shows diagrammatically a cross-sectional view of an implant restoration according to a seventh embodiment; [Figure 18]13 shows diagrammatically a cross-sectional view of an implant restoration according to an eighth embodiment; [Figure 19a] 13A and 13B show a side view and a schematic representation of an implant restoration according to a seventh embodiment. [Figure 19b] 1A-1C are schematic diagrams showing top views of a blocker in an extended and retracted position. [Figure 19c] 1A-1D are schematic side views of a blocker in an extended and retracted position. [Figure 20] 13 shows a schematic cross-sectional view of an implant restoration according to a ninth embodiment. [Figure 21] 13A and 13B show schematic cross-sectional views of an implant restoration according to a tenth embodiment. [Figure 22] 13A-13C show schematic cross-sectional views of a separation step between a prosthesis and a connecting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] The dental restoration has a fixture 1 provided with at least one implant 1a, preferentially an implant 1a and an abutment 1b. The dental restoration is also provided with a connecting device 2 with a body, a dental prosthesis 3 and a fixing screw 4, also called prosthesis screw. The dental restoration is an implant dental restoration, i.e. a dental restoration fixed by a fixture 1 with at least one implant 1a. The dental restoration is advantageously an implant restoration for a single tooth, i.e. a crown, or an implant restoration for several teeth, i.e. a bridge. The dental restoration can also be a healing collar, a coping, an imprint transfer device.

[0037] The fixture 1 is secured firmly within the jawbone and extends beyond the bone. The fixture 1 terminates in a head 5 which protrudes through the bone and gums. The head 5 is convex and protrudes through the gums.

[0038] The implant 1a is a dental implant designed to be inserted into the jawbone. The implant 1a is placed flush with the bone. Once placed, the implant 1a is not removable from the jawbone (lower or upper). The implant 1a serves as a fixture 1 for a dental restoration. The implant 1a is preferably made from titanium, a titanium alloy or ceramic, advantageously from zirconia. The implant 1a preferably has an external thread 1a present on its outer wall so as to be fixed in the bone. The implant 1a with a convex protruding head 5 can be realised according to configurations known to the skilled person. It is advantageous to manufacture the head 5 from a metal or ceramic material, preferentially from zirconia.

[0039] In one embodiment, the fixture 1 comprises an implant 1a and a removable abutment 1b for the implant 1a. The abutment 1b has an external thread that is inserted into the internal thread of the implant 1a. The implant 1a does not protrude from the gums, only the head 5 where the abutment 1b terminates protrudes from the gums. In another configuration, the fixture 1 is a single piece. The implant 1a also forms the abutment 1b, which is then non-removable. Figure 5 shows a single piece fixture 1, while Figures 1, 2 and 4 show an implant 1a with a removable abutment 1b. Figure 1 shows a particular embodiment of the fixation of the abutment 1b in the implant 1a.

[0040] 3, fixture 1 defines a tap portion 6 opening from head portion 5. Tap portion 6 is an internally threaded portion designed to receive fixation screw 4 to secure coupling device 2 onto fixture 1. Fixation screw 4 has a head portion 4a and a threaded portion 4b that operates in conjunction with tap portion 6 to fasten dental prosthesis 3 to fixture 1.

[0041] The use of the fixture 1 with a protruding convex head 5 allows the support of the prosthesis 3 to be offset against the bone, thereby reducing the risk of infection. The head 5 is a convex element of low height and small cross section that is placed on the fixture 1a when it is placed or when it is exposed if implanted during osseointegration.

[0042] However, this configuration of the head 5 makes direct placement of the prosthesis 3 difficult. The dimensional difference between the outer wall of the head 5 and the cavity of the prosthesis 3 can actually lead to high stresses. In the absence of fixation by adhesion, especially by abutments designed for this purpose, it is common for ceramic prostheses to eventually break down. In the case of metal prostheses, premature wear of the interface is induced.

[0043] It is therefore particularly advantageous to use a connecting device 2 which provides a mechanical connection between the prosthesis 3 and the fixture 1, more particularly between the prosthesis 3 and the head 5. The connecting device 2 is fitted to the head 5. The connecting device 2 is removably fitted to the fixture 1, thereby facilitating adjustment of the prosthesis 3 relative to the other teeth and the fixture 1.

[0044] Once the fixture 1 is placed in the jawbone, the connecting device 2 can be engaged and disengaged without having to perform any action on the fixture 1, thereby avoiding excessive stress on the fixture 1 and contamination of the fixture 1 with adhesive.

[0045] The coupling device 2 can be made from metal or from a polymeric material or partly from metal and partly from a polymer. The metal material used can be titanium or a titanium alloy. It is particularly advantageous to use a shape memory alloy, for example an alloy mainly comprising nickel and titanium, to form the coupling element 2. It is preferable to use a shape memory alloy with a phase change temperature of 100° C. or higher. The polymeric material used is preferentially selected from polyetheretherketone (PEEK), polyetherketoneketone (PEKK) or their derivatives. Other materials are also possible that exhibit the required mechanical performance and biocompatibility. In general, the material or materials selected to form the coupling device 2 means that the coupling device is less likely to deform when subjected to a compressive force in the longitudinal direction of the fixation screw. Manufacturing the coupling device 2 from a metal and / or polymeric material is particularly advantageous, since it allows a better control of the dimensions of the coupling device 2, resulting in a better control of the fixation to the fixture 1 on the head 5, whose dimensions are also well controlled. The coupling device 2 is not a custom-made part that must be adapted to the jaw configuration, which means that the coupling device can be manufactured with the same dimensional control as the head 5. This ensures a better mechanical connection between the head 5 and the coupling device 2 compared to the mechanical connection between the head 5 and the prosthesis 3 .

[0046] The upper surface of the head 5 bears against the inner wall of the cavity of the connecting device 2. The outer surface of the head 5 is advantageously complementary, or as complementary as possible, to the inner surface of the cavity defined in the connecting device 2 to ensure that chewing forces are adequately absorbed. The connecting device 2 allows for an increased contact surface area used to secure the prosthesis 3 to the fixture 1.

[0047] To facilitate installation of the connecting device 2, it is particularly advantageous to provide the head 5 with an outer wall that monotonically decreases from the foot region to the top region of the head 5. The outer surface of the head 5 has a shape complementary to the shape of the inner surface of the connecting device 2. The upper surface of the head 5 is designed to contact the upper surface of a cavity designed to receive the head 5.

[0048] The first rotation blocker 7a, configured to prevent rotation between the head 5 and the connecting device 2, is preferentially present to prevent rotation of the connecting device 2 relative to the head 5 and thus of the prosthesis 3 relative to the fixture 1. Rotation around an axis parallel to the longitudinal axis of the fixation screw 4 is prevented. The first rotation blocker 7a can be formed by a polygon, preferably a convex polygon, formed on the outer surface of the head 5 and a complementary shape formed by an internal cavity emerging in the connecting device 2. The use of two complementary shapes makes it possible to prevent rotation and ensures a strong contact that promotes the absorption of mechanical forces. Other configurations are also possible. In the configurations shown in figures 1 to 6, 8, 9 and 12 to 22, the anti-rotation device is formed by a convex regular polygon, for example a hexagon. Other shapes of polygons are also possible, even convex non-regular polygons or non-convex polygons. It is also possible to provide any shape that prevents rotation. To prevent rotation, the connecting device 2 may be formed with grooves 8 and / or tabs that are inserted into or receive corresponding tabs and / or grooves on the dental prosthesis 3, as shown in FIG. 11.

[0049] The body of the coupling device 2 defines a through hole 9 designed to receive a fixing screw. The through hole 9 of the coupling device 2 is located in continuity with the tapped portion 6 of the fastener 1.

[0050] The coupling device 2 is provided with a stopper 10. The stopper 10 blocks the coupling device 2 against the fastener 1 and blocks the head 4a of the fastening screw so as to prevent longitudinal translation of the fastening screw. A rotation blocker 7a prevents rotation of the coupling device 2 about the longitudinal axis of the fastening screw relative to the fastener 1. When the fastening screw 4 presses against the stopper 10, the coupling device 2 is immovably mounted relative to the fastener 1. Figures 4, 5 and 8, 14a, 17, 18, 20-22 show the stopper 10 formed by a body, whereas Figures 6, 9, 11 and 12 show the stopper removable from the body.

[0051] The dental prosthesis 3 is fixed to the fixture 1 by a blocker 11 connected to the body of the connecting device 2. The locking device 11 is configured to fasten the prosthesis 3 to the connecting device 2. In one embodiment, the stopper 10 is in direct contact with the screw head 4a. In an alternative embodiment, the screw head 4a presses against the blocker 11 which itself presses against the stopper 10 (FIG. 9).

[0052] The connecting device 2 has at least one blocker 11 configured to present a first position, called the retracted position, and a second position, called the extended position. In the extended position, the outer cross section of the blocker 11 is larger than in the retracted position. The blocker 11 can be manufactured in various ways. The blocker 11 can be designed to be removable or non-separable from the body of the connecting element 2.

[0053] Preferentially, the blocker 11 has a rest position corresponding to the extended position. Once installation of the prosthesis 3 has taken place, the blocker 11 elastically deforms between the extended and retracted positions until the blocker 11 again extends through the recess or recesses 12 of the prosthesis 3. Once the prosthesis 3 has been installed around the connecting device 2, the blocker 11 is preferentially in a rest position. The rest position of the blocker 11 is the position of the blocker 11 when it is not biased by the fixing screw 4.

[0054] The blocker 11 is designed to be inserted into at least one recess 12 of the prosthesis 3 covering the connecting device 2 to fix the prosthesis 3 on the connecting element 2. The recess 12 of the prosthesis 3 can be an annular groove. The annular groove prevents the formation of an anti-rotation device between the prosthesis 3 and the blocker 11. Alternatively, several separate recesses are possible.

[0055] The movement from the first position to the second position corresponds to a lateral expansion in the direction of the dental prosthesis 3 so as to come into contact with the dental prosthesis 3. In the extended position, the blocker 11 provides a mechanical fixation of the dental prosthesis 3 on the connecting element 2 by being inserted into the recess 12. The dental prosthesis 3 becomes inseparable from the connecting device 2. The blocker 11 and the recess 12 cooperate to fix the dental prosthesis 3 on the connecting device 2 and thus on the fixture 1. In the extended position, the blocker 11 fixes the prosthesis 3 on the connecting device 2 and prevents translation along the longitudinal axis of the fixing screw 4.

[0056] In order to reduce the risk of breakage of the dental prosthesis 3, it is advantageous to form at least one recess 12 in the upper part of the dental prosthesis 3, i.e. in an area with a large amount of material. In the illustrated exemplary embodiment, the blocker 11 is located in the head region 2c of the body such that the recess 12 is in the upper part of the prosthesis 3, i.e. in an area away from the end of the foot of the connecting device 2, in order not to excessively weaken the dental prosthesis 3.

[0057] Preferentially, the blocker 11 partially blocks the through hole 9 of the connecting device 2. The blocker 11 is preferentially deformed by the screw head 4a inserted into the through hole 9 of the connecting device 2. The screw head 4a is wider than the threaded portion 4b. When the screw head 4a is inserted into the connecting device 2, the screw head 4a moves until it presses against the blocker 11. The screw head 4a exerts a force on the blocker 11 which extends outward, exerting a force or a greater force on the prosthesis 3.

[0058] In a particular embodiment, the screw head 4a exerts stress on the blocker 11 which, by deformation, moves from a retracted position to an extended position. When the screw head 4a is against the stopper 10 of the coupling device 2, the blocker 11 is in the extended position and remains in the extended position.

[0059] By using the blocker 11, whose rest position allows the prosthesis 3 and the connecting device 2 to be fixed together, it is possible to simultaneously install or remove the assembly formed by the prosthesis 3 and the connecting device 2, thereby reducing handling and therefore the risk of dislodgement or ingestion. This also avoids the need for a layer of adhesive between the connecting device 2 and the prosthesis 3. An equivalent result can be achieved when the initial installation of the fixing screw 4 results in a plastic deformation of the blocker 11, which has the effect of fixing the prosthesis 3 and the connecting device 2 together even after the fixing screw 4 has been removed.

[0060] Particularly advantageously, the screw head 4a has a circular cross section of constant diameter over at least part of its height, designed to face the blocker 11 perpendicularly to the longitudinal axis of the fixation screw. The circular cross section ensures that a constant force is applied to the blocker 11 and thus to the prosthesis, regardless of how far the fixation screw 4 is pushed into the connecting device and fastener 1. This makes it possible to separate the forces applied between the connecting device 2 and fastener 1 and the forces applied between the blocker 11 and the prosthesis 3.

[0061] When the fixing screw 4 abuts against the stopper 10, i.e. when the fixing screw 4 is fixed on the head 5, the screw head 4a forms an obstacle which prevents the blocker 11 from being deformed towards the retracted position, i.e. towards the position which allows disengagement between the prosthesis 3 and the connecting device 2. The screw head 4a clamps the blocker 11.

[0062] In the embodiments shown in Figures 1-5, 14a, 17, 21 and 22, the blocker 11 may be formed by one or more fins 13 cut out of a side wall of the body of the coupling device 2. The one or more fins 13 are formed by cutting into the side wall.

[0063] In a preferential manner, several fins 13 are arranged on the side walls of the body of the connecting device 2. Advantageously, the fins 13 are distributed evenly over the circumference of the body of the connecting device 2. Depending on the configuration, the fins 13 are fitted so as to deform the top or bottom end of the fins 13 when a force is applied to the screw head 4a to move it into an extended position. The fins 13 can move around a rotation axis perpendicular to the longitudinal axis of the fastening screw 4. It is also possible to provide the fins 13 to move around an axis parallel to the longitudinal axis of the fastening screw 4.

[0064] The fin 13 can be of any shape. Advantageously, the mobile part of the fin 13 is provided with at least one recess, e.g. a protruding part which is inserted into the groove 12 of the dental prosthesis 3, so as to reduce the size of the groove / recess along the longitudinal axis of the fastening screw 4. The protruding part can be of any shape, e.g. flat, rounded or pointed. In a preferential manner, the fin 13 is formed in the upper half of the connecting device 2. It is advantageous to form the fin 13 in the upper circular part of the body of the connecting device 2, i.e. in the head region 2c.

[0065] In an alternative embodiment shown in figures 6-12, 16b, 18, 19 and 20, the blocker 11 is a removable part with respect to the body of the coupling device 2. The blocker 11 can be in the form of a ring or a C-shaped part. The blocker 11 passes through one or more openings 14 in the body of the coupling device 2. The blocker 11 can be a C-shaped element 11 partially surrounding the body. The blocker 11 has a rest position in which it partially blocks the through hole 9 of the coupling device 2. When the fixing screw is inserted into the coupling device 2, the blocker 11, which moves in at least one recess 12, e.g. a groove or hole, is pressed so as to extend beyond the outer side wall. The movement is lateral or radial.

[0066] In a further embodiment shown in Figures 16a, 16b, 18, 19a and 20, the blocker 11 has a removable part in the form of a retaining element, preferably a ring, preferably in the form of a "C", as shown in Figures 16c, 19b and 19c. The head region 2c of the connecting device 2 has an annular groove designed to receive the removable part of the blocker 11. The annular groove extends around the connecting device and overlaps with the fins 13. The outward deformation of the fins 13 deforms the removable part and prevents disassembly of the prosthesis 3. If the blocker 11 works in an elastic deformation zone and there is no fixation screw 4, it is advantageous for the blocker 11 to push the fins 13 into a retracted position, facilitating the insertion of the prosthesis 3. When the screw head 4a presses against the stopper 10, it exerts a force on the fin 13, deforming the blocker 11 and exerting a force on the groove 12 of the prosthesis 3, preventing the prosthesis 3 from disengaging from the coupling device 2 even during chewing efforts. In a preferred embodiment, the blocker 11 is made of a shape memory alloy, for example NiTi. Shape memory alloys are difficult to machine and weld. It is advantageous to form the blocker 11 in a simple shape for ease of implementation, while enjoying the same advantages as a coupling device 2 made entirely of a shape memory alloy or in which the fin 13 is made of a shape memory alloy. For example, it is advantageous to use a shape memory alloy blocker 11 that, after being plastically deformed by the initial insertion of the fixation screw 4 into the coupling device 2, clasps the prosthesis 3 to the coupling device 2 in the absence of external stress. When the coupling device 2, the blocker 11, and the prosthesis 3 are heated above the transformation temperature of the shape memory material, the blocker 11 returns to a configuration that disengages the prosthesis 3 from the coupling device 2.

[0067] Figures 19b and 19c show the deformation of the C-shaped blocker between the extended and retracted positions in side and top views. Figure 19a shows the C-shaped blocker in the retracted position with the prosthesis 3 pressing against the blocker 11.

[0068] 6 and 7 show an embodiment in which the screw head 4a presses against the blocker 11 and presses the blocker 11 against the stopper 10 when the screw head 4a extends partially from the blocker 11 in the direction of the dental prosthesis 3.

[0069] 8 shows an embodiment in which the blocker 11 is made up of two parts. The first part partially blocks the through hole 9 and forms an arm which presses against the second part which passes through at least one recess 12, e.g. a groove 12 or a hole in the body. When the screw head 4a presses the first part against the stopper 10, the arm presses against the second part which is then inserted into the prosthesis 3, making the dental prosthesis 3 inseparable from the connecting device 2.

[0070] 9 and 10 show an embodiment in which the blocker 11 is a ring arranged on the stopper 10 of the connecting device 2. The screw head 4a presses the blocker 11 towards the stopper 10, and the blocker 11 is deformed in the direction of at least one recess 12, e.g. a groove 12 in the dental prosthesis 3, making the dental prosthesis 3 unseparable from the connecting device 2.

[0071] The blocker 11 is designed to be inserted into at least one recess 12, such as a groove 12, in the inner cavity of the dental prosthesis 3. The blocker 11 exerts a lateral or radial force on the dental prosthesis 3 to securely fasten the dental prosthesis 3 onto the connecting device 2. The blocker 11 is reversibly engaged such that the blocker 11 allows the dental prosthesis 3 and the connecting device 2 to be fixedly engaged and allows reverse movement from an extended position to a retracted position to allow the dental prosthesis 3 and the connecting device 2 to be separated from each other.

[0072] In this way, by removing the fixation screw 4, the mechanical fixation provided by the blocker 11 is removed and it is possible to remove the prosthesis 3 without touching the fixture 1 and in particular without applying any rotational forces to it.

[0073] The use of the coupling device 2 as an intermediate part for fixing the prosthesis 3 on the fixture 1 is particularly advantageous. As mentioned above, in order to facilitate its installation, the fixture 1 has a head 5 of small dimensions that tend to generate strong forces on the prosthesis 3, thus encouraging the use of hollow fixtures for the fixation of the prosthesis by means of long and wide abutment screws. If specific abutments are used that receive the prosthesis 3 by bonding, this gives rise to the problems mentioned above with respect to the adhesive.

[0074] The use of the connecting device 2 makes it possible to provide a larger contact surface with the prosthesis 3 and reduces the forces at the interface with the prosthesis 3. This makes it possible to reduce the risk of wear of the inner walls or breakage of the prosthesis 3, especially when the latter is made of ceramic.

[0075] It is particularly advantageous to provide the connecting device 2 such that it presents an outer cross section that decreases monotonically from the foot region 2a to the head region 2c. The foot region 2a is in contact with the fixture 1. The head region 2c corresponds to the opposite end and is located near the top of the prosthesis 3. The monotonous reduction is observed without taking into account the blocker 11. Such a configuration in conjunction with the complementary shape of the inner cavity of the prosthesis 3 allows the prosthesis 3 to be formed with a greater thickness of material in the dental prosthesis at its top than at its foot. The prosthesis 3 is therefore easier to withstand masticatory stresses, which are preferably at least two times greater. By reducing the outer cross section of the connecting device 2, the cross section of the through-hole in the upper part of the prosthesis 3 is reduced, thereby increasing its mechanical strength.

[0076] The dental prosthesis 3 can be made from different materials, for example ceramics, polymeric materials or metal alloys. The dental prosthesis 3 can reproduce the shape of one or more teeth. The dental prosthesis 3 can be covered by or include a cosmetic material. The dental prosthesis 3 defines a longitudinally extending through hole 15. The through hole 15 extends from the coronal end to the apical end of the dental prosthesis 3. The coronal end is designed to contact the opposing tooth, whereas the apical end is designed to contact the connecting device 2 and / or possibly the implant 1a. Since the dental prosthesis 3 is custom-made to replace one or more teeth, its dimensions are not well controlled compared to those of the connecting device 2 and the head 5. It is therefore particularly advantageous to use a connecting device 2 made from metal to perform the fixation on the fixture 1 and to offset the fixation of the dental prosthesis 3. Such a configuration reduces the risk of infection that occurs if the dental prosthesis 3 does not fit perfectly into the head of the fixture 1.

[0077] The outer shape of the connecting device 2 and the shape of the cavity of the prosthesis 3 are as complementary as possible in order to achieve a good transmission of forces between the prosthesis 3 and the fixture 1. The cavity presses against the connecting device 2. In a particular embodiment, the prosthesis 3 does not have any contact with the fixture 1. In an advantageous manner, the upper surface of the connecting device 2 is covered by the dental prosthesis 3 so that the dental prosthesis 3 presses against this part of the connecting device 2 and absorbs part of the longitudinal forces of the fixing screw.

[0078] When the prosthesis 3 is fitted into the connecting device 2, the through hole 15 enters into the extension of the through hole 9. The dental prosthesis 3 is placed into the connecting device 2 via the apex, i.e. from above, which makes the installation of the dental prosthesis 3 easier.

[0079] The fixing screw 4 is inserted through the top of the prosthesis 3. It passes through the through hole 15 to the through hole 9 and the stopper 10. In a preferential manner, the through hole 15 of the prosthesis 3 has a cross-section that allows the fixing screw 4 to pass directly through it. The fixing screw 4 can pass freely through the through hole 15. The through hole 15 has a minimum cross-section that is greater than the maximum cross-section of the fixing screw 4. In other words, the through hole 15 allows the fixing screw 4 to pass directly through the dental prosthesis 3. The apical end of the through hole 15 is tapered so as to define a cavity for receiving the connecting device 2. The cavity designed to receive the connecting device 2 has a cross-section that decreases from its bottom end to its top end.

[0080] The connecting device 2 provides a mechanical connection between the head 5 and the prosthesis 3. The connecting device extends longitudinally beyond the head 5 such that the contact surface between the prosthesis 3 is greater than the contact surface between the head 5 and the connecting device 2. The connecting device 2 defines an internal cavity designed to receive the head 5 of the fastener, the cavity extending from the seating area of ​​the connecting device, i.e. the area designed to contact the fastener over the entire head 5, to a through hole designed to receive the fastening screw 4. The cavity has a cross section that decreases from the seating area defining the through hole for the fastening screw 4 to the upper surface. Preferably, the cross section decreases continuously. The cavity is located between the stop 10 and the seating area, which makes it easier to achieve a compact configuration and better force absorption. The prosthesis 3 rests on the outer surface of the connecting device 2, the inner surface of the connecting device 2 resting on the head 5. The prosthesis 3 and the head 5 face each other on the outer and inner faces of the connecting device 2 in a cross-sectional plane perpendicular to the longitudinal axis of the through hole, which is the longitudinal axis of the fixing screw 4. The face-to-face mounting ensures a better force transmission between the prosthesis 3 and the head 5. When the fixing screw 4 is installed, the fixing screw 4, the head 5, the connecting device 2 and the prosthesis 3 belong to the same plane perpendicular to the longitudinal axis of the fixing screw 4.

[0081] The through hole 15 of the prosthesis 3 can be curved or have an axis that is offset from the axis of the through hole 9 of the coupling device 2 .

[0082] The connecting device 2 covers only a portion of the inner wall that defines the through hole 15. The overlap is observed in a direction perpendicular to the longitudinal axis of the fixing screw 4. The coronal end of the through hole 15 is not covered by the connecting device 2.

[0083] The tap portion 6 is placed beyond the terminal surface of the gums, i.e. beyond the upper terminal surface of the mandible and the lower terminal surface of the maxilla.

[0084] The connecting device 2 has a simple shape which allows it to be manufactured with good dimensional accuracy, for example by machining. Due to the high manufacturing accuracy, the dimensions are well controlled and a precise mechanical connection can be formed with the fastener 1 for a good transmission of forces. In an advantageous manner, the connecting device 2 is formed only by one or more circular sections and / or one or more frustoconical sections. For a good transmission of forces in the longitudinal direction of the through hole 9, it is advantageous to have a frustoconical portion of the head 5 and a complementary frustoconical portion on the inner surface of the body.

[0085] In the embodiment shown in Figs. 1-6, 8, 9, 11, 13-22, the connecting device 2 is decomposed into a number of separate parts that fit together successively in the longitudinal direction of the connecting device 2. In the embodiment shown in Figs. 1-5, the connecting device 2 comprises three or at least three successive regions from the bottom end to the top end. There is a frustoconical foot region 2a followed by a similarly frustoconical waist region 2b and a circular head region 2c. The two frustoconical regions narrow in width from their bottom part to their top part. The cross-sectional narrowing provided by the waist region 2b is greater than that provided by the foot region 2a. The waist region 2b supports the dental prosthesis 3 for a good transmission of mechanical forces between the dental prosthesis 3 and the connecting device 2. The head region 2c is circular and its upper part is covered by the prosthesis 3 for better stress absorption.

[0086] In an alternative embodiment shown in Figures 6, 8 and 9, the connecting device 2 has a frustoconical foot region 2a followed by a circular head region 2c. The dental prosthesis 3 defines at least one recess having the shape of a groove 12 designed to receive a blocker 11 in the form of a ring or having a C-shape, such as the one shown in Figure 7 or 10. In one particular case, a slot for receiving the blocker 11 separates the foot region 2a and the head region 2c. In another particular case, the slot is located in the foot region 2a, and the foot region 2a extends after the slot to the head region 2c.

[0087] In an alternative embodiment not shown, the connecting device 2 has a frustoconical foot region 2a followed by a frustoconical head region 2c. The head region 2c has a more pronounced inclination than the foot region 2a. The inclination is the angle that exists between the outer sidewall and the longitudinal axis of the center of the hole designed to receive the fixing screw 4.

[0088] FIG. 11 shows a coupling device 2 with three successive regions as in FIGS. 1-4, where the slot for receiving the blocker 11 is located between the waist region 2b and the head region 2c.

[0089] In a preferential manner, the screw head 4a has a circular cross section, rather than a frustoconical one, in its part designed to come into contact with the blocker 11. The circular cross section extends into the body of the connecting device 2. If the cross section is circular, the deformation of the blocker 11 is constant, regardless of the depth of the recess of the screw head 4a. The diameter of the screw head 4a determines the deformation and therefore the holding force exerted by the blocker 11 on the prosthesis 3. The strength of the pressing of the screw head 4a against the stopper 10 determines the holding force of the connecting device 2 on the fixture 1, and therefore in part the holding force of the prosthesis 3 on the fixture 1. This configuration allows a better control of the fixing force exerted on the prosthesis 3, thereby reducing the risk of failure of the prosthesis, in particular of the ceramic prosthesis 3. This configuration limits the mechanical stress on the dental prosthesis 3 in the longitudinal direction away from the fixing screw 4. The illustrated configuration is advantageous over the configurations presented in Korean Patent Publication No. 10-1943437 or U.S. Patent Application Publication No. 2020 / 0015940.

[0090] By increasing the contact surface with the prosthesis 3 by the connecting device 2, the stresses applied to the prosthesis are reduced, preventing it from being displaced relative to the fixture 1. With reduced stresses, narrower and / or shorter fixation screws can be used. By using narrower fixation screws, the cross section of the through hole 15 through the prosthesis 3 can be reduced. More material is then available at least in the upper part of the prosthesis 3, resulting in increased strength and improved esthetics.

[0091] The use of shorter screws 4 makes it easier to curve the through holes 15. It is easier to define the position of the upper end of the through holes 15 to facilitate insertion of the fixation screws and / or to make the through holes 15 less visible.

[0092] The use of a shorter screw 4 also makes it possible to reduce the depth of the tap 6 in the fixture 1. This is particularly advantageous if the fixture 1 has an abutment 1b, since the height of the abutment can be reduced. The tap 6 can extend to less than half the height of the implant, preferentially only in the upper third of the implant, and even more preferentially only in the part that is located above the jawbone. It is advantageous for the tap to be located only in the head 5 and / or not to extend beyond the connection device 2.

[0093] The use of shorter and / or narrower fixation screws makes it easier to use tap sections 6 that are offset with respect to the insertion axis of the implant 1a. For screwed prostheses, it is advantageous to use screwed angled abutments. To facilitate the installation and fixation of the prosthesis 3, it is known to fix the prosthesis by means of an angled abutment with a screw inclined with respect to the cavity axis of the implant. The use of a connecting device 2 that improves the contact with the prosthesis 3 makes it possible to reduce the dimensional constraints for the fixation screws, thereby increasing the accessible angular range. It is possible to form tap sections 6 whose longitudinal axis is inclined with respect to the longitudinal axis of the implant by at least 15°, preferably at least 20°, or even at least 30°.

[0094] In a preferential manner, the dental prosthesis 3 defines at least one recess 12 having the shape of an annular groove to receive the blocker 11 in the extended position without forming an anti-rotation device. Alternatively, the dental prosthesis 3 defines a plurality of recesses designed to receive protruding regions, e.g. fins 13, of the blocker 11.

[0095] It is advantageous to separate the function of fixation of the prosthesis 3 in the longitudinal direction and the anti-rotation function between the prosthesis 3 and the connecting device 2. The second rotation blocker 7b is used between the body and the prosthesis 3. The dimensional constraints for the second rotation blocker 7b are reduced, since the connecting device 2 can increase the contact surface with the prosthesis 3. The second rotation blocker 7b, also called the second anti-rotation device, configured to prevent the rotation of the prosthesis 3 relative to the connecting device 2 can be formed by a polygon on the outer wall of the connecting device 2 and a complementary shape in the cavity of the dental prosthesis 3. Rotation around an axis parallel to the longitudinal axis of the fixing screw 4 is prevented. Other configurations are also possible. If the rotation blocker 7b is installed in the lower part of the connecting device 2, it is more effective because the rotation blocker 7b is located in the foot area of ​​the prosthesis 3, which increases the available cross section.

[0096] It is particularly advantageous to have an anti-rotation device 7b formed on the outer wall of the connecting device 2, since this provides a large usable surface area and facilitates the transmission of forces between the prosthesis 3 and the connecting device 2, since the dimensions of the prosthesis 3 are less well controlled than in the case of the head 5. It is particularly advantageous to have an anti-rotation device 7b arranged between the stop 10 and the seat area of ​​the connecting device 2, since the available body cross-section is large and it becomes easier to transmit forces between the prosthesis 3 and the connecting device 2 to prevent the prosthesis 3 from rotating. Preferably, the anti-rotation device 7b extends over less than 50% of the cavity height. Advantageously, the anti-rotation device 7b extends from the foot of the body. It is particularly interesting to realize that the anti-rotation device 7b is formed by a regular polygon on the outer surface of the body.

[0097] In a particularly advantageous manner, the first anti-rotation device 7a and the second anti-rotation device 7b belong to one and the same plane perpendicular to the longitudinal axis of the fastening screw 4. The first anti-rotation device surrounds the preferred second anti-rotation device. The first anti-rotation device can have a shape identical or different from that of the second anti-rotation device. It is advantageous to have two rotation blockers that are of identical shape. Figures 1 to 5 show the first anti-rotation blocker 7a and the second anti-rotation blocker 7b in the form of a convex regular polygon, while Figure 11 shows the formation of longitudinally extending tabs 15 and grooves.

[0098] If the dental prosthesis 3 forms several teeth, it is preferable not to use a rotation blocker 7a between the connecting device 2 and several fixtures 1 in order to facilitate the insertion of several dental prostheses (bridges). The prosthesis 3 is fixed to the jawbone by the connecting device 2 and several fixtures 1 capped by fixation screws 4.

[0099] In a preferred embodiment, the outer surface of the connecting device 2, which is in contact with the inner surface of the cavity arranged in the prosthesis 3, is covered by a covering layer made of a polymeric material. The covering layer, also called coating, forms a seal that provides airtightness between the connecting device 2 and the prosthesis 3. Alternatively or supplementarily, the covering layer is formed on the outer wall of the head 5 so as to form a seal between the head 5 and the prosthesis 3.

[0100] In a preferential manner, the polymer layer has a thickness comprised between 15 μm and 150 μm, preferably between 75 μm and 100 μm, more preferentially between 50 μm and 100 μm. In a preferential manner, the coating layer is constituted by or comprises polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyetherketoneketone (PEKK) or derivatives thereof, such as fluorinated derivatives thereof. These materials are particularly advantageous since they are also compatible with titanium, titanium alloys and shape memory materials, such as Nitinol. Other materials may be used for the coating, which are biocompatible. It is also possible to use hydrophobic polycationic polymers, such as those disclosed in document US Pat. No. 10,500,317. The use of a hydrophobic coating layer inhibits the formation of a biofilm on the fixation device 1, in particular on the head 5 and / or the coupling device 2.

[0101] A coating layer may cover the vertical parts of the connecting device 2 and / or the protruding parts of the fastener 1 to provide additional strength.

[0102] In a particular embodiment, the coating layer is colored to have a tooth-colored white or gum-colored pink color, and the color of the coating layer masks the color of the metal material forming the connector 2 and / or fixture 1 through the dental prosthesis 3 by its transparency.

[0103] It is particularly advantageous to provide that the outer surface of the connecting device 2 is covered by a coating layer, preferably having a thickness comprised between 30 μm and 75 μm. The thickness of the coating layer can be uniform, but it is advantageous to provide a greater thickness on the fins 13 and the expansion elements 11.

[0104] In a preferential manner, the connecting device 2 is provided with a peripheral rim 2d which forms the bottom end of the connecting device and is designed to support the peripheral bottom end of the dental prosthesis 3. The peripheral rim 2d can also be covered by a coating layer having a thickness greater than the average thickness of the coating layer, for example at least 10% greater. The peripheral rim 2d is preferentially supported by the fixture 1. Preferably, the peripheral rim 2d is only covered by the coating layer or at least its upper side is covered by the coating layer.

[0105] Preferably, in the embodiment shown in figures 13, 14a and 14b, the fixture 1 has an implant abutment with a peripheral shoulder 18 designed to receive the peripheral rim of the connecting device 2 so that the connecting device 2 is supported on the fixture 1. The grip is designed to absorb the longitudinal force of the fixation screw 4.

[0106] Advantageously, the peripheral shoulder 18 defines an annular groove 19. The foot area of ​​the connecting device 2 has a protrusion 20 which fits into the annular groove 19. Preferably, the peripheral shoulder 18 extends outwardly from the annular groove 19 to allow the connecting device to be supported around the annular groove. By inserting the protrusion 20 into the annular groove 19, the connecting device 2 is better held in position relative to the fastener 1. This allows a better absorption of forces, in particular lateral stresses. This reduces the transmission of lateral forces to the fixing screw 4, thereby reducing the risk of the screw loosening. The protrusion may be, for example, a circular single protrusion or may be formed by multiple protrusion zones. The peripheral shoulder 18 and the connecting device 2 form an annular joint.

[0107] The peripheral rim 2d extends continuously around the connecting device 2, and the dental prosthesis 3 is in continuous peripheral contact with the peripheral rim 2d. The contact between the dental prosthesis 3 and the rim 2d forms a ring. To improve the tightness between the connecting device 2 and the dental prosthesis 3, the upper surface of the peripheral rim 2d slopes upwards from the center to the periphery of the connecting device 2, the upper part corresponding to the upper side formed by the upper part of the connecting device 2, in contrast to the bottom part formed by the contact area with the abutment 1b or the implant 1a. The end part of the dental prosthesis 3 designed to contact the peripheral rim 2d is flat. There is a greater force in the outer part of the peripheral rim 2d to better compress the coating layer if necessary.

[0108] The inclination angle is small, advantageously less than 10°, preferentially less than 5° and even more preferentially comprised between 0.5° and 2.5°. In the illustrated embodiment, the reference plane is formed by the central part of the upper surface of the peripheral rim 2d. When moving towards the periphery, the upper surface inclines upwards by the inclination angle. In the illustrated exemplary embodiment, the interface plane with the fastener is parallel to the plane defined by the central part of the upper surface of the peripheral rim 2d.

[0109] In an alternative embodiment, the top surface of the peripheral rim 2d is flat and the bottom surface of the dental prosthesis 3 is inclined. The outer part is lower than the inner part, with results equivalent to those described above. However, this embodiment is more difficult to realize with ceramic dental prostheses 3. According to another approach, the coating layer exhibits a gradual increase in coating thickness from the center to the outside, so as to form a more efficient seal between the prosthesis 3 and the peripheral rim 2d.

[0110] In a preferential manner, the cross section of the peripheral rim 2d is larger than the cross section of the dental prosthesis 3. Advantageously, the cross section of the dental prosthesis 3 is smaller than the cross section of the peripheral rim 2d by a value comprised between 100 μm and 200 μm. In this way, the peripheral rim 2d protrudes outwards over the entire contact area between the peripheral rim 2d and the dental prosthesis 3, thereby providing good tightness. Such an embodiment is shown in figures 4, 6, 8, 9, 11, 14a, 15, 16b, 17, 18, 19a, 20, 21 and 22.

[0111] FIG. 12 shows an embodiment in which the peripheral rim 2d extends beyond the prosthesis 3. FIG. 12 also shows an embodiment in which the outer part of the peripheral rim 2d is raised from the center to the periphery in the direction of the prosthesis 3. The left part of the figure shows an implant dental restoration with a fixture 1 capped by a head 5. The head 5 is covered by a connecting device 2. A blocker 11 is integral with a stopper 10 which presses against the head 5. A fixing screw is screwed into the tapped part 6. The screw head 4a presses against the stopper 10. The screw head 4a deforms the blocker 11 which passes through one or more through holes in the body blocking the blocker 11 and the connecting device 2 against the head 5.

[0112] In an advantageous embodiment, the coating layer comprises metal particles or metal ions, for example silver particles or silver ions. An embodiment has already been shown in the document US 5984905. The use of metal ions avoids the replication of bacterial DNA.

[0113] In certain embodiments, the blocker 11 is elastically deformable between a retracted position and an extended position. Installation of the fixation screw 4 causes the blocker to elastically move from the retracted position to the extended position. Removal of the fixation screw 4 causes the blocker to elastically move from the extended position to the retracted position, allowing the prosthesis 3 and the coupling device 2 to be separated from one another.

[0114] In another particular embodiment, the blocker 11 is plastically deformed between a retracted position and an extended position. The installation of the fixing screw 4 moves the blocker from the retracted position to the extended position and blocks the dental prosthesis 3 against the connecting device 2. Removal of the fixing screw does not result in a movement from the extended position to the retracted position. The prosthesis 3 and the connecting device 2 remain fixed to each other, which allows for easy disassembly of the dental restoration. It is therefore advantageous to manufacture the blocker 11 or the entire connecting device 2 from a shape memory material. By heating the blocker 11 above a threshold temperature, it is possible to return the blocker 11 to the retracted position, so that the dental prosthesis 3 and the connecting device 2 can be separated from each other. For example, the threshold temperature is higher than 100° C. to obtain a phase change or shape change. The blocker 11 returns to the retracted position. The separation between the prosthesis 3 and the connecting device 2 is performed after separation from the fixture 1, which is easier to handle.

[0115] The above-described embodiments are particularly advantageous for the production of single or multiple dental restorations. A screwed prosthesis can be produced, i.e. the prosthesis is fastened by means of a fastening screw 4 screwed into the implant fixture 1, which makes the assembly and disassembly of the implant fixture 1 easy. The anti-rotation device or devices can be produced easily and compactly. A reliable fixation is obtained without adhesives or sealings.

[0116] With better control of the dimensions of the connecting device 2, it becomes easier to deposit coating layers to improve the hermeticity of the restoration without creating areas of stress concentration.

[0117] The prosthesis 3 defines a cavity for receiving a coupling device 2 through which a fixation screw 4 passes. In order to be able to tighten or loosen the fixation screw 4 in a difficult position, the end opening of the screw head 4a is preferentially provided with a cylindrical or cylindrically-conical opening for receiving a screwdriver with a spherical end. It is thus easier to tighten or loosen the fixation screw when the screwdriver is not in the longitudinal axis of the fixation screw. Different embodiments are presented in the documents WO 2019 / 168671 and EP 2 607 722 A1.

[0118] In a preferential way, the connecting device 2 is fixed to the dental prosthesis 3 before installing the connecting device 2 on the fixture 1. The connecting device 2 fixed to the dental prosthesis 3 can also be separated by an extractor if a correction of the dental prosthesis is necessary. The assembly is not provided with a fixing screw 4. When the assembly is placed on the abutment 1b or implant 1a, the fixing screw passes through the through hole 15 and through hole 9. The installation of the fixing screw 4 acts on the blocker 11, which deforms and makes the dental prosthesis 3 inseparable from the connecting device 2. It is therefore possible to install the assembly on the abutment 1b or implant 1a. This assembly makes the dentist's work easier, since he can carry out the assembly outside the oral cavity, i.e. in a larger area without any danger for the patient who may swallow these components.

[0119] In an advantageous manner, the bottom end of the connecting device 2 and the fastener 1 are provided with one or more clip devices 16 configured to clip the connecting device 2 onto the fastener 1. The one or more clip devices 16 deform elastically to allow the connecting device 2 to be fixed onto the fastener 1 and then easily removed without the need to screw in the fastening screw 4. The clip device 16 does not allow chewing forces to be supported and does not avoid the need for the fastening screw 4. In the illustrated embodiment, the clip device is formed by a fin formed at the bottom of the connecting device 2. The fin terminates in a protruding area designed to be inserted into a groove 17 of the abutment 1b or implant 1a. The reverse configuration is also possible. When the connecting device 2 is fixed onto the abutment 1b or implant 1a, the fin is deformed and inserted into the groove 20.

[0120] If the blocker 11 is configured to be inserted into the prosthesis 3 in a stress-free state, it is preferable to use an extractor 22, such as the one shown in Fig. 22, to facilitate separation between the prosthesis 3 and the coupling device 2. This extractor 22 is particularly advantageous if the blocker 11 is not made of a shape memory alloy configured to allow disengagement between the prosthesis 3 and the coupling device 2 when the blocker 11 is heated above a threshold temperature.

[0121] Advantageously, the through hole 9 is threaded, preferably in the stopper zone 10, i.e. between the stopper 10 for receiving the screw head and the cavity for receiving the head 5. The threaded portion 21 of the through hole 9 slides along a first threaded portion 29 of the threaded rod. The extractor 26 also has a gripping element 25 which is in contact with the prosthesis 3 and opposes the displacement of the prosthesis 3. The threaded rod passes through the gripping element 25. The threaded rod slides into the threads 21 of the stopper 10 of the connecting device 2, and the rotation of the threaded rod generates a force on the connecting device 2 along the longitudinal axis of the threaded rod. The gripping element 25, which is in contact with the prosthesis 3, opposes the movement of the prosthesis 3, so that a force is introduced between the prosthesis 3 and the connecting device 2, which has the effect of separating the prosthesis 3 and the connecting device 2. Advantageously, the threaded rod has a second threaded portion 30 which slides into the retaining plate 23. The retaining plate 23 has a threaded portion 28. The retaining plate 23 rests on the extractor 26 to push it towards the assembly formed by the prosthesis 3 and the connecting device 2. A first threaded portion 29 pulls the connecting device 2 towards the retaining plate 23. The fixing screw 4 does not have a thread that slides along the thread 21 of the stopper zone.

[0122] In an advantageous method, the dental restoration is formed on a laboratory model.

Claims

1. A connecting device (2) for attaching a dental restoration prosthesis (3) to an upper jaw implant fixture (1), wherein the connecting device (2) comprises: A longitudinally extending body having a foot end and a head end, the body extending from the foot end to the head end and defining a through-hole designed to receive a fixing screw (4), the foot end being designed to be supported by the upper jaw implant fixture (1); a body; A stopper (10) designed to block the screw head (4a) of the fixing screw (4) for fixing the connecting device (2) to the upper jaw implant fixture (1); A blocker (11) fixed to the body, the blocker (11) being deformable and having a retracted position and an extended position, the extended position having an outer cross-section larger than the cross-section of the retracted position, and in the extended position, the blocker being inserted into at least one recess (12) of the prosthesis (3) covering the connecting device (2) and designed to fix the prosthesis (3) onto the connecting device (2) along the longitudinal direction; a blocker (11); A first part of an external anti-rotation device (7b) designed to prevent rotation of the prosthesis (3) relative to the connecting device (2); Comprising; The blocker (11) has a stationary position, which is the extended position, for fixedly mounting the prosthesis (3) onto the connecting device (2) in the absence of the fixing screw (4); The body has an outer cross-section that tapers from the foot end towards the head end, and the outer wall of the body forms the first part of the external anti-rotation device (7b) from the foot end; The inner surface of the body defines a cavity designed to receive a head (5) protruding from the upper jaw implant fixture (1), the cavity having a cross-section that tapers from the foot end towards the upper surface, the through-hole opening onto the upper surface for passing the fixing screw (4), the foot region forming a ring around the head (5), the cavity facing the first part of the external anti-rotation device (7b) perpendicular to the longitudinal direction; A connecting device (2) for a dental restoration prosthesis (3), characterized in that the stopper (10) is arranged between the blocker (11) and the cavity in the longitudinal direction.

2. The connecting device (2) for a dental prosthetic (3) according to claim 1, wherein the blocker (11) is made of a shape memory alloy and is designed to plastically deform from the retracted position to the extended position by inserting the screw head (4a) to the stopper (10).

3. The inner wall of the main body defining the cavity forms a first part of an internal rotation prevention device (7a) configured to prevent rotation of the connecting device with respect to the head (5), and the internal rotation prevention device (7a) extends from the foot region toward the head region, and the first part of the internal rotation prevention device (7a) faces the first part of the external rotation prevention device (7b) perpendicular to the longitudinal axis. The connecting device (2) for a dental prosthetic (3) according to claim 1.

4. The outer wall of the main body is covered by a coating layer made of a compressible polymer material. The connecting device (2) for a dental prosthetic (3) according to claim 1.

5. The external rotation prevention device (7b) is separate from the blocker (11), and the external rotation prevention device (7b) extends from the foot region of the main body or from a periphery designed to receive the foot of the prosthesis (3). The connecting device (2) for a dental prosthetic (3) according to claim 1.

6. The external rotation prevention device (7b) has a cross-section larger than the cross-section of the blocker (11) in an observation plane perpendicular to the longitudinal axis. The connecting device (2) for a dental prosthetic (3) according to claim 1.

7. A fixing screw (4) having a screw head (4a) with a circular cross-section is provided such that the blocker (11) has a certain deformation regardless of the driving of the screw head (4a) into the through-hole, and when the screw head (4a) is supported by the stopper (10), the screw head (4a) forms an obstacle to prevent deformation of the blocker (11) from the extended position to the retracted position. The connecting device (2) for a dental prosthetic (3) according to claim 1.

8. The fixing screw (4) has a length shorter than the length of the connecting device (2), and the length is measured along the longitudinal axis. The connecting system for a dental prosthetic (3) according to claim 7.

9. A connecting system for a dental prosthetic appliance (3) according to claim 7, comprising a fixture (1) designed to be installed within the jawbone, said fixture (1) having a convex-shaped head (5) designed to protrude from the gum, said head (5) extending in the longitudinal direction and defining a tap portion (6) that extends at least partially outside the gum and the jawbone, said head (5) having an outer cross-section complementary to the inner cross-section of the cavity, said head (5) and the cavity forming a rotation blocker (7a) configured to prevent rotation of the connecting device (2) relative to said head (5) about an axis parallel to the longitudinal axis, said fixing screw (4) being screwed into said tap portion (6), and said connecting device (2) being removably fitted to said head (5).

10. The connecting system for a dental prosthetic appliance (3) according to claim 9, wherein said tap portion (6) does not extend beyond the height of the overlap by said connecting device (2) on said fixture (1).

11. The connecting system for a dental prosthetic appliance (3) according to claim 9, wherein said connecting device (2) and said fixture (1) define a clip device (16, 17) configured to fix said connecting device (2) to said fixture (1) by elastic deformation.

12. The connecting system for a dental prosthetic appliance (3) according to claim 9, wherein said fixture (1) has an implant abutment defining an annular groove (19), the foot region of said connecting device (2) having a protrusion (20) that fits into said annular groove (19), and the foot region extending radially outward from said protrusion (20) to form a base region that contacts a bearing region on said implant abutment.

13. A dental prosthesis comprising the connecting system according to claim 9 and having a prosthesis (3) with a through hole (15) opening onto said through hole (9) of said connecting device (2), said through hole (15) of said prosthesis (3) widening from its root tip end to its crown end.

14. The dental prosthesis according to claim 13, wherein said fixing screw (4) does not contact said prosthesis (3).

15. The dental prosthesis according to claim 13, wherein said prosthesis (3) does not contact said fixture (1).

16. A method for performing dental restoration, comprising Providing a fixture (1) designed to be fixed on a laboratory model jawbone, the fixture (1) having a head (5) designed to protrude and be mounted with respect to the gum, the head (5) defining a tap portion (6) that extends at least partially outside the gum and the jawbone, step; Providing a connecting device (2) according to claim 1, step; Providing a dental prosthesis (3) defining a through-hole (15), step; Placing the connecting device (2) and the dental prosthesis (3) on the head (5), the connecting device being positioned between the head (5) and the prosthesis (3), step; Passing a fixing screw (4) through the through-hole (15) of the prosthesis (3) and the through-hole (9) of the connecting device (2), step; Screwing the fixing screw (4) into the tap portion (6) until the fixing screw (4) abuts against the stopper (10), the fixing screw (4) fixing the connecting device (2) onto the fixture (1), and deforming the blocker (11) such that the blocker (11) is inserted into the at least one recess (12) of the prosthesis (3) to fixedly assemble the connecting device (2) and the prosthesis (3) in the longitudinal direction, step; Removing the fixing screw (4) and detaching the assembly formed by the connecting device (2) and the prosthesis (3) from the fixture (1) of the laboratory model, step; Fitting the assembly formed by the connecting device (2) and the prosthesis (3) into the mouth and then fastening this assembly to the fixture (1) using the fixing screw (4), step; A method comprising.

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