Dental subassembly for individual prosthetic restoration of a tooth and a first element intended to be joined thereto

Abstract

A dental subassembly (1) for an individual prosthetic restoration of a tooth is shaped to be received on a dental implant (2), the dental subassembly (1) can be assembled with a first element (3) in the form of a layered core or in the form of a ceramic core. The first element (3) has a first through passage (4). The dental subassembly (1) includes a ring (11) intended to be fitted into the first through passage (4) of the first element (3) and to be held tightly to form a seat for a first fixing screw (10) intended to be screwed into the dental implant (2).

Description

[Technical Field]

[0001] The present invention relates to the field of dental restorations, more specifically to: - a dental subassembly for an individual prosthetic restoration of a tooth, shaped to be received on a dental implant, said dental subassembly being adapted to be assembled with a first element of the core type or ceramic core type on which layering is performed, and a first element for an individual prosthetic restoration of a tooth of layered core type or ceramic core type, intended to be received on said dental subassembly; [Background technology]

[0002] In the context of individual prosthetic restoration of teeth, through-fixed prostheses are often used, i.e. prostheses with through passages that allow for (direct or indirect) fixation of the prosthesis by means of fixation screws (that pass through the prosthesis) that are fixed to dental implants that are osseointegrated in the patient's jaw.

[0003] Different types of transfixation prostheses are known: - those containing a core (especially a metal core) on which layering is carried out by the prosthodontist, leaving the passage open (application of one or more layers of material that make it possible to give the appearance as close as possible to a natural tooth); - those containing a ceramic core (machined from a block of ceramic or produced in particular by sintering ceramic powder), optionally coated by the prosthodontist with one or more very light texturing or coloring layers that achieve an appearance as close as possible to that of natural teeth.

[0004] Depending on the position of the dental implant fixed in the patient's jaw, it is often necessary to carefully adjust the position of the annular outlet of the well, which allows the passage of the fixation screw. In practice, the problem is that there is no space available in the patient's mouth, but the fixation screw must be in a position to be accessed using a screwdriver tool. Furthermore, when chewing, it is important that the annular outlet of the access well is positioned away from the active part of the tooth (canine or free edge).

[0005] In the documents EP 3 202 365 B1 and US 2017 / 0224447 A1 in the name of the Applicant, solutions are proposed which make it possible to fix a through-fixed dental prosthesis with a layered core or with a ceramic core on a dental implant, resorting to angled through-channels in order to take into account constraints on the orientation of the osseointegrated dental implant, on the accessibility and on the preservation of the active part of the tooth, without unnecessarily weakening the mechanical strength of the through-fixed dental prosthesis.

[0006] For this purpose, the present teaching relies on a second element provided with flexible longitudinal fins, the free edge of which is intended to engage in an annular groove formed in a first element of the core or ceramic core type in which the layering is carried out. The first element is shaped according to the preamble of claim 16.

[0007] In order for the first element to be held on the second element and pressed against it in a satisfactory manner, it is necessary to manufacture the first element with very high precision, especially where the grooves and their frustoconical portions against which the free edges of the longitudinal fins are intended to abut are concerned. The required precision is unfortunately so high that in most cases it is not compatible with the manufacturing capabilities of the machines commonly used by prosthodontic practitioners to manufacture the first element.

[0008] Furthermore, the prosthetic practitioner must ensure that the second element can be securely attached to the first element. This means precisely controlling the geometry of the groove, and more particularly the geometry of its frustoconical portion. However, the prosthetic practitioner will most likely have control means adapted to do this.

[0009] In documents US 2019 / 0365510 A1 and WO 2018 / 138630 A1, also in the name of the Applicant, an alternative solution is proposed which relies on a fixing part which is attached and fixed to the dental implant, which can be expanded by screwing a screw into the dental implant, said expansion allowing a first element to be retained on the dental implant, in accordance with the preamble of claim 16.

[0010] Document US 2001 / 0044095 A1 describes a dental subassembly that complies with the preamble of claim 1. Summary of the Invention

[0011] One problem addressed by the present invention is to provide a solution that allows resorting to angled through-passages to fix a through-fixed dental prosthesis, including a layered or ceramic core, onto a dental implant, taking into account constraints on the orientation, accessibility and preservation of the active part of the tooth of the osseointegrated dental implant, without unnecessarily weakening the mechanical strength of the through-fixed dental prosthesis.

[0012] At the same time, the invention aims to provide an alternative fixation solution that is compatible with the manufacturing capabilities of the machines commonly used by prosthodontic practitioners to manufacture the first element.

[0013] In order to achieve the above and other objects, the present invention first provides a dental subassembly for an individual prosthetic restoration of a tooth, shaped to be received on a dental implant, the dental subassembly being adapted to be assembled with a first element of the layered core type or ceramic core type, the first element including a first through passage including a first passage section extending from a proximal end of the first element along a first longitudinal axis, the first element including at least a first rotational indexing member and a first axial retention member, the dental subassembly comprising: - a second element having a second through passage extending along a second longitudinal axis, the second element including a bearing surface shaped to be able to receive the first element in abutting axial engagement, the second element including a proximal end shaped to be able to axially abut against the dental implant or to be able to penetrate into the dental implant; - a first fixation screw including a first screw head extending from a first screw shank adapted to penetrate the second element, the first screw head being received in the second through passage and having an external threaded portion shaped to be threadably received into the dental implant, the first screw head being sized to allow it to be received by axially penetrating into the first passage section along the first longitudinal axis from the proximal end of the first element; a ring shaped to form a seat for the first screw head, the ring being shaped to be mounted and retained on the first element by axial penetration along the first longitudinal axis in the first passage section from the proximal end of the first element to a predetermined axial position at which the locking means can resist translational movement of the ring in the direction of the proximal end of the first element; Including, According to the present invention: - the second element includes at least a second rotary indexing member and a third rotary indexing member; the ring includes at least one fourth rotary indexing member; - the third and fourth rotary indexing members are shaped to interlock by axially interpenetrating along the second longitudinal axis when the second element and the ring are in a penetrating orientation relative to one another about the second longitudinal axis, such that, in the coupled position, the third and fourth rotary indexing members prevent rotation of the ring relative to the second element about the second longitudinal axis; - the first and second rotary indexing members are shaped to interlock with one another by axially interpenetrating along the second longitudinal axis when the first and second elements are in a penetrating orientation relative to one another about the second longitudinal axis, such that in the coupled position, the first and second rotary indexing members prevent rotation of the first element relative to the second element about the second longitudinal axis; - in its predetermined axial position, the ring can pivot about the first longitudinal axis until the first axial retention member reaches a locking orientation that opposes translational movement of the ring towards the proximal end of said first element; A dental subassembly is proposed.

[0014] This type of subassembly requires a much lower precision in manufacturing the first element than is required to manufacture the first element described in EP 3 202 365 B1, and therefore can be manufactured using most machines commonly used by prosthodontic practitioners.

[0015] When the ring is not in the at least one locked angular orientation, the first, second, third and fourth indexing members can advantageously form axial abutments that prevent the abutment surface of the second element from coming into axial abutment with the proximal end of the first element.

[0016] This is a simple and easily perceptible way to ensure that the ring (which engages the first element and may therefore be difficult or even invisible) is in the correct locking angular orientation within the first element as soon as the abutment surface of the second element abuts axially against the proximal end of the first element.

[0017] The first friction means may preferably enable the second element to be driven into the first element with a friction fit that slows translational movement of the second element away from the first element along the first longitudinal axis.

[0018] The friction fit makes it possible to reduce the risk of the first and second elements separating prematurely and of the latter being lost or swallowed by the patient before it can be secured to the implant.

[0019] To facilitate manipulation by the practitioner and to further reduce the risk of accidental loss, the ring may advantageously be captured on the shank of the first screw.

[0020] The third and fourth rotary indexing members preferably include: - at least one longitudinal fin on either the ring or the second element, - on the other of the ring or the second element, a cylindrical portion having a tubular side wall including at least one longitudinal slot adapted to receive said at least one longitudinal fin.

[0021] The third and fourth rotary indexing members therefore have a simple structure adapted for interconnection by axial interpenetration.

[0022] The at least one second rotary indexing member may advantageously include a radial protrusion around the cylindrical portion of the second element, the radial protrusion adapted to engage the first rotary indexing member, which is itself in the form of a longitudinal groove in the side wall of the first passage section of the first element, when the abutment surface of the second element is received axially against the proximal end of the first element.

[0023] Thus, the first and second rotary indexing members have a simple structure adapted for interconnection by axial interpenetration.

[0024] It is preferable if: - the ring includes a radial protrusion around the periphery of the ring, the radial protrusion being adapted to abut against a first axial retention member when the ring is in the locking orientation, the first axial retention member being itself in the form of a shoulder in the first passage section of the first element; the radial protrusion is shaped so that the ring can slide axially within the longitudinal groove while axially penetrating the first passage section of the first element.

[0025] Thus, to engage the first element, the ring with radial projections cooperates ingeniously with the structure of the first rotary indexing member, thereby allowing for an efficient and compact implementation. The radial projections and first axial retaining member cooperate in a manner similar to a bayonet locking system and are therefore intuitive in use.

[0026] On the second element, the radial projections and the longitudinal slots or fins may advantageously be angularly offset relative to one another about the second longitudinal axis.

[0027] The ring may preferably include second friction means capable of slowing rotation of the ring relative to the first element about the first longitudinal axis when the ring is in the locked orientation. The second friction means thus contributes to stabilizing the ring and maintaining it in the locked orientation before the practitioner assembles the first and second elements.

[0028] The second through passage of the second element may advantageously include: - a seat for the head of a second screw adapted to penetrate the second element, which is received in the second passageway to be screwed into the dental implant; - a distal internal thread adapted to receive a third screw that allows fixation of the temporary penetrating fixation element to the second element.

[0029] The distal internal thread and the third thread allow for fixation and detachment of at least one temporary penetrating fixation element to and from the second element, for example, as follows: a healing portion, the side walls of which are shaped to be at least partially in contact with the gums, and / or - an impression-taking part shaped to be scanned intraorally and / or overmolded with impression-taking compound, and / or - Temporary dental prostheses.

[0030] Therefore, by fixing the first component, the second component can remain fixed to the implant from healing to the final restoration. Thus, the patient's soft tissue (gingiva) can remodel undisturbed around the entire second component and above the dental implant, and once the second component is attached and fixed on the dental implant (preferably when the dental implant is fitted), it does not need to be removed, so the connective tissue attachment is not interfered with, resulting in better stability of the soft tissue. This also contributes to reducing the risk of vertical bone loss, and the gingiva has good sealing contact around the entire second component.

[0031] To ensure reliable identification of the implant orientation and the final orientation that the first element will have, the temporary penetrating fixation element can preferably be rotationally indexed on the second element.

[0032] The present invention then proposes a first element for an individual prosthetic restoration of a layered core type or ceramic core type tooth, the first element comprising a first through passage including a first passage section extending from a proximal end of the first element along a first longitudinal axis, and comprising a first axial retention member; the first element can be assembled onto a dental subassembly shaped to be received on a dental implant, - a second element including a second through passage extending along a second longitudinal axis, the second element including an abutment surface shaped to be able to receive the proximal end of the first element in abutting axial engagement, the second element having a proximal end shaped to be able to abut axially against the dental implant or to be able to penetrate into the dental implant; - a first locking screw including a first screw head extending from a first screw shank adapted to penetrate a second element, the first locking screw being received in the second through passage and having an external threaded portion shaped to be threadably received into the dental implant, the first passage section of the first element being sized to allow the first screw head to be received by axial penetration along a first longitudinal axis from a proximal end of the first element; a ring shaped to form a seat for the first screw head and to be mounted within the first element by axial penetration along the first longitudinal axis in the first passage section from the proximal end of the first element to a predetermined axial position at which the locking means can resist translational movement of the ring in the direction of the proximal end of the first element; Including, - the second element includes at least a second rotary indexing member and a third rotary indexing member; the ring includes at least one fourth rotary indexing member; - the third and fourth rotary indexing members are shaped to interlock by axially interpenetrating along the second longitudinal axis when the second element and the ring are in a penetrating orientation relative to one another about the second longitudinal axis, such that, in the coupled position, the third and fourth rotary indexing members prevent rotation of the ring relative to the second element about the second longitudinal axis; According to the present invention, - the first element includes at least one first rotary indexing member; - the first and second rotary indexing members are shaped to interlock with one another by axially interpenetrating along the second longitudinal axis when the first and second elements are in a penetration orientation about the second longitudinal axis, such that, in the interlocked position, the first and second rotary indexing members prevent rotation of the first element relative to the second element about the second longitudinal axis; the first passage section of the first element is shaped such that, at its predetermined axial position, the first axial retention member allows the ring to pivot about the first longitudinal axis in a locking direction in which the first axial retention member opposes translational movement of the ring toward the proximal end of the first element.

[0033] This type of first element requires a manufacturing precision that is much lower than that required to manufacture the first element described in European Patent EP 3 202 365 B1, so that most of the machines commonly used by prosthetic dentists can be used to manufacture this first element. In fact, the predetermined axial position of the ring in the first element provided by the first axial retention member does not have to be strictly accurate along the first longitudinal axis, and slight variations in this axial position can easily be compensated for by threading the first fixation screw more or less into the implant until the proximal end of the first element axially abuts the abutment surface of the second element.

[0034] When the ring is not in the at least one locked angular orientation, the first, second, third and fourth indexing members can advantageously form axial abutments that prevent the abutment surface of the second element from coming into axial abutment with the proximal end of the first element.

[0035] This is a simple and easily perceptible way to ensure that the ring (which engages the first element and is therefore barely visible, if at all) is actually in a locked angular orientation within the first element as soon as the abutment surface of the second element axially abuts the proximal end of the first element.

[0036] The first friction means may preferably enable a friction fit of the second element in the first element that slows down translational movement of the second element away from the first element along the first longitudinal axis.

[0037] The friction fit makes it possible to reduce the risk of the first and second elements separating prematurely and of the latter being lost or swallowed by the patient before it can be secured to the implant.

[0038] The first rotary indexing member is advantageously in the form of a longitudinal groove formed in the side wall of the first passage section of the first element, and a radial projection forming the second rotary indexing member of the second element can engage when the abutment surface of the second element receives the proximal end of the first element in axial abutting engagement.

[0039] Thus, the first and second rotary indexing members have a simple structure adapted for interconnection by axial interpenetration.

[0040] Visible if: - the first axial retention member is in the form of a shoulder in the first passage section of said first element; The ring includes a radial protrusion around the periphery of the ring, the radial protrusion being adapted to abut against the shoulder when the ring is in the locking orientation.

[0041] The radial protrusion and first axial retention member cooperate in a manner similar to a bayonet locking system and are therefore intuitive in use.

[0042] Furthermore, the first axial retention member in the form of a shoulder is easy to manufacture by most machines commonly used by prosthodontic practitioners, and its exact shape can be controlled by very simple control means (a simple rod mounted on the support surface and provided with a radial bulge at its free end adapted to abut against the shoulder may be sufficient).

[0043] The first through passage advantageously further includes a second passage section that extends obliquely from the first passage section such that the first and second passage sections form a non-zero angle therebetween.

[0044] Such an angle allows for careful adjustment of the position of the annular outlet of the second passage section, which allows the passage of a screw-driving tool, by ensuring that it is positioned away from the active part of the tooth (canine or free edge) during mastication. In order to drive the first locking screw in rotation, it may be necessary to utilize, for example, a tool that can be angled with the screw head when tightening or loosening the screw, as described, for example, in document EP 2 607 722 A1.

[0045] According to another aspect of the present invention, a dental component is proposed, comprising: a dental subassembly as described above, and - The first element as above.

[0046] According to a further aspect of the invention, a method for the ex vivo pre-assembly for subsequent assembly of such dental components is proposed, the method comprising the following steps: a) inserting a shank of a first screw into a ring; b) inserting the ring and the first screw head into the first passage section by axially translating the ring from the proximal end of the first element along the first longitudinal axis to reach a predetermined axial position; c) pivoting the ring about the first longitudinal axis to a locked orientation.

[0047] The single part can then be manipulated and the resulting preliminary assembly (formed by the screw, ring, and first element) can be mounted on a second element present in the patient's mouth and to which connective tissue has already formed a good attachment. The dental component is then fixed by threading the screw into the dental implant. The screw head exerts traction on the first element (via the ring that forms a screw seat in the first element) and the proximal end of the first element abuts against the abutment surface of the second element to securely fix the first element to the second element.

[0048] Alternatively, a single part can be manipulated and the resulting pre-assembly (formed by the screw, ring, and first element) can be mounted onto a second element present in the patient's mouth, and the second element is then attached to the proximal end of the first element by engaging the shank of the first screw with the second through passage until the abutment surface of the second element abuts the proximal end of the first element. [Brief explanation of the drawings]

[0049] Other objects, features and advantages of the present invention will become apparent from the following description of specific embodiments thereof, which is given with reference to the accompanying drawings. [Figure 1] 1 is a partial cross-sectional side view of a dental subassembly according to one particular embodiment of the present invention, the subassembly including a second element, a ring, and a screw. [Figure 2] FIG. 2 is a perspective view of a second element of the subassembly of FIG. 1. [Figure 3] FIG. 2 is a top view of the second element of the subassembly of FIG. 1. [Figure 4] FIG. 2 is a perspective view of a ring of the subassembly of FIG. 1. [Figure 5] FIG. 2 is a bottom view of the ring of the subassembly of FIG. 1. [Figure 6] FIG. 2 is a side cross-sectional view of a ring of the subassembly of FIG. 1. [Figure 7] FIG. 2 is a rear view of a first element according to one particular embodiment of the present invention. [Figure 8] FIG. 8 is a side view of the first element of FIG. 7. [Figure 9] FIG. 8 is a cross-sectional side view of the first element of FIG. 7. [Figure 10] FIG. 8 is a first cross-sectional view of the first element of FIG. 7. [Figure 11] FIG. 8 is a second cross-sectional view of the first element of FIG. 7. [Figure 12] 8 is a perspective view of a step in the manufacture of a pre-assembly including the screw of FIG. 1, the ring of FIG. 4, and the first element of FIG. 7. FIG. [Figure 13] 13 is a perspective view of a later step in the manufacture of the pre-assembly of FIG. 12. FIG. [Figure 14] 1 is a perspective view of an assembly of dental components according to one particular embodiment of the present invention; FIG. [Figure 15] FIG. 15 is a side view of a portion of the dental component of FIG. 14 during assembly. [Figure 16] FIG. 15 is a side view of the dental components of FIG. 14 after assembly. [Figure 17] FIG. 15 is another side view of a portion of the dental component of FIG. 14 during assembly. [Figure 18] FIG. 17 is another perspective view of the assembly of the dental component of FIG. 16 onto a dental implant. [Figure 19] FIG. 17 is a longitudinal cross-sectional view of the dental component of FIG. 16 secured onto a dental implant. [Figure 20] FIG. 3 is a perspective view showing the fixation of the healing portion onto the dental implant by the second element of FIG. 2. [Figure 21] FIG. 21 is a side view of FIG. 20. [Figure 22] FIG. 3 is a perspective view showing the fixation of a temporary post intended to be used to form a temporary dental prosthesis on a dental implant by means of the second element of FIG. 2; [Figure 23] FIG. 23 is a side view of FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0050] When the same reference numbers are used in more than one figure, variant, or embodiment of the invention, those reference numbers designate the same or similar elements in each of the figures, each of the variants, or each of the embodiments.

[0051] FIG. 1 shows, by way of example, an embodiment of a dental subsystem 1 for an individual prosthetic restoration of a tooth, shaped to be received on a dental implant 2 (FIG. 19).

[0052] The dental subassembly 1 is intended to be assembled with a layered core-type or ceramic core-type first element 3 (Figures 7 to 11), which has a first through passage 4 including a first passage section 4a extending from a proximal end 3a of the first element 3 along a first longitudinal axis II, and which includes at least a first rotary indexing member 5 and a first axial retaining member 6.

[0053] The cross-sectional shape of the first passage section 4a varies along the first longitudinal axis II, as shown in FIGS. 10 and 11 on two different cross-sectional planes P10 and P11.

[0054] The dental subassembly 1 includes: a second element 7 (FIGS. 1 to 3) having a second through passage 8 extending along a second longitudinal axis II-II, the second element 7 including an abutment surface 9 shaped to be able to receive the proximal end 3a of the first element 3 in abutting axial engagement, the second element 7 including a proximal end 7a shaped to be able to support the dental implant 2 in abutting axial direction or to be able to penetrate into the dental implant 2, - a first locking screw 10 (Fig. 19) comprising a first screw head 10a from which extends a first screw shank 10b adapted to penetrate the second element 7 by being received in the second through passage 8, and provided with an externally threaded portion 10c shaped to be screwed into said dental implant 2, the first passage section 4a of the first element 3 being sized to allow the first screw head 10a to be received by axial penetration along the first longitudinal axis II from the proximal end 3a of the first element 3 (Figs. 12 and 13), - a ring 11 shaped to form a seat 20 for the first screw head 10a and to be attached to the first element 3 by axial penetration along the first longitudinal axis II in the first passage section 4a from the proximal end 3a of the first element 3 (Figures 12 and 13) to a predetermined axial position (Figures 13 and 19) at which the locking means 12 can resist translational movement of the ring 11 in the direction of the proximal end 3a of the first element 3.

[0055] 1 and 2, it can be seen that the second element 7 comprises a proximal portion 70a with a non-circular cross-section (in this case a triangular cross-section with rounded vertices), which is intended to be received in a distal portion 29b of the inner housing 29 of the dental implant 2 (FIG. 21), the distal portion 29b also having a complementary non-circular cross-section in order to obtain rotational indexing of the second element 7 and the dental implant 2 about the second longitudinal axis II-II.

[0056] The second element 7 includes at least a second rotary indexing member 13 and a third rotary indexing member 14 .

[0057] The ring 11 includes at least one fourth rotary indexing member 15 .

[0058] The third rotary indexing member 14 and the fourth rotary indexing member 15 are shaped to couple to each other by axially penetrating each other along the second longitudinal axis II-II when the second element 7 and the ring 11 are in a penetration direction (FIG. 15) relative to each other about the second longitudinal axis II-II, so that in the coupled position the third rotary indexing member 14 and the fourth rotary indexing member 15 prevent rotation of the ring 11 relative to the second element 7 about the second longitudinal axis II-II.

[0059] The first and second rotary indexing members 5, 13 are shaped to couple to one another by axially penetrating one another along the second longitudinal axis II-II when the first and second elements 3, 7 are in a penetration direction (FIG. 14) relative to one another about the second longitudinal axis II-II, so that in the coupled position (FIG. 19), the first and second rotary indexing members 5, 13 prevent rotation of the first element 3 relative to the second element 7 about the second longitudinal axis II-II.

[0060] At its predetermined axial position, the ring 11 can pivot about the first longitudinal axis II up to a locking direction (Figure 13) in which the first axial retaining member 6 opposes translational movement of the ring 11 toward the proximal end 3a of the first element 3.

[0061] As can be seen from FIG. 14, when the ring 11 is in the at least one locked angular orientation (FIGS. 14 and 15), the first indexing member 5, the second indexing member 13, the third indexing member 14, and the fourth indexing member 15 are coupled together so that the abutment surface 9 of the second element 7 can axially abut the proximal end 3a of the first element 3 (the first indexing member 5 and the second indexing member 13 on the one hand, and the third indexing member 14 and the fourth indexing member 15 on the other hand) (FIG. 16).

[0062] Conversely, when ring 11 is not in the at least one locked angular orientation, first indexing member 5, second indexing member 13, third indexing member 14, and fourth indexing member 15 form an axial abutment that prevents abutment surface 9 of second element 7 from coming into axial abutment with proximal end 3 a of first element 3. Two situations can then arise: - when the second element 7 and the ring 11 are in their penetration direction (Fig. 15) relative to each other about the second longitudinal axis II-II, the first indexing member 5 and the second indexing member 13 form an axial abutment that prevents the abutment surface 9 of the second element 7 from coming into axial abutment against the proximal end 3a of said first element 3; When the first element 3 and the second element 7 are in a penetration direction (Figure 14) relative to each other about the second longitudinal axis II-II, the third indexing member 14 and the fourth indexing member 15 form an axial abutment (Figure 17) that prevents the abutment surface 9 of the second element 7 from coming into axial abutment against the proximal end 3a of the first element 3.

[0063] The first friction means 16 enables a friction fit of the second element 7 in the first element 3, slowing down the translational movement of the second element 7 away from the first element 3 along the first longitudinal axis II. In this case, the first friction means 16 comprises an elastic ring 16a with a radial slot, the outer diameter D16a of which (FIG. 15) is larger than the inner diameter D4a of the first passage section 4a (FIG. 10). When the second element 7 engages the first element 3, the elastic ring 16a is radially compressed (by virtue of its radial slot) and penetrates into the first passage section 4a.

[0064] 1, it can be seen that the first locking screw 10 includes an annular rib 10d having an outer diameter D10d that is slightly larger than the inner diameter D11a (FIG. 5) of the ring 11. Thus, the ring 11 can be captured and attached to the shank 10b of the first screw 10 between the first screw head 10a and the annular rib 10d.

[0065] More specifically, it can be seen from FIGS. 1-6 that the third rotary indexing member 14 and the fourth rotary indexing member 15 include: - on the ring 11, three longitudinal fins 15a-15c; - on the second element 7, a cylindrical portion 17 having a tubular side wall 17a formed with three longitudinal slots 14a to 14c adapted to receive said longitudinal fins 15a to 15c.

[0066] It can also be seen from Figures 2 and 3 that the at least one second rotary indexing member 13 includes three radial protrusions 13a-13c around the cylindrical portion 17 of the second element 7, which radial protrusions 13a-13c are adapted to engage with the first rotary indexing member 5, which is itself in the form of three longitudinal grooves 5a-5c formed in the side wall of the first passage section 4a of the first element 3, when the abutment surface 9 of the second element 7 receives the proximal end 3a of the first element 3 in axial abutting engagement.

[0067] The radial projections 13a-13c and longitudinal slots 14a-14c on the second element 7 are angularly offset relative to one another about the second longitudinal axis II-II.

[0068] More specifically, from Figures 4 and 5, the following can be seen: - the ring 11 comprises around its periphery three radial projections 11a-11c adapted to abut against a first axial retention member 6 when the ring 11 is in the locking orientation (Fig. 19), the first axial retention member 6 being itself in the form of a shoulder 6a in the first passage section 4a of said first element 3; the radial protrusions 11a-11c are shaped in such a way that the ring 11 can slide axially in the longitudinal grooves 5a-5c while penetrating axially into the first passage section 4a of the first element 3.

[0069] The radial protrusions 11a to 11c give the ring 11 an outer diameter D11b.

[0070] The ring 11 includes second friction means 19 adapted to slow the rotation of the ring 11 relative to the first element 3 about the first longitudinal axis II when the ring 11 is in the locking orientation. In this case, the free ends of the longitudinal fins 15a-15c include radial bosses 19a-19c defining an outer diameter D19 that is larger than the inner diameter D4a of the first passage section 4a. Thus, when the ring 11 is pivoted towards the locking orientation, the longitudinal fins 15a-15c are slightly bent radially towards the center of the ring 11, and the radial bosses 19a-19c abut against the side walls of the first passage section 4a.

[0071] More specifically, from FIG. 1 it can be seen that the second through passage 8 of the second element 7 comprises: a seat 20 for the head of a second screw 21 (FIGS. 21 and 23) adapted to pass through the second element 7 and to be received in the second through-passage 8 in order to be screwed into the dental implant 2; a distal internal thread 22 adapted to receive a third screw 23 allowing fixation of a temporary through-fixation element 24 (FIGS. 20 to 23) to the second element 7;

[0072] The temporary through-fixation element 24 of Figures 20 and 21 is a healing portion 25, the sidewall 25a of which is shaped to at least partially contact the gums.

[0073] The temporary through-fixation element 24 of Figures 22 and 23 is an inner tube 26a intended to attach a standard commercially available artificial tooth to form a temporary dental prosthesis.

[0074] Also, a temporary piercing fixation element 24 of the impression-taking type may be provided that is shaped to be scanned intraorally and / or overmolded with impression-taking compound.

[0075] The temporary through-fixation element 24 can be rotationally indexed on the second element 7 by means of longitudinal grooves which are similar to the longitudinal grooves 5a-5c and which cooperate similarly with the radial projections 13a-13c of the second element 7.

[0076] The first element 3 intended to cooperate with the dental subassembly 1 is shown more particularly in FIGS.

[0077] The first element 3 is a dental element for an individual prosthetic restoration of a layered core or ceramic core tooth. By assembling the first element 3 with the dental subassembly 1, the first element 3 can be attached and fixed to the dental implant 2.

[0078] As previously indicated, the first element 3 includes a first through passage 4 including a first passage section 4a extending along a first longitudinal axis II from a proximal end 3a of the first element 3. The first element 3 also includes a first axial retention member 6.

[0079] The first element 3 includes at least one first rotary indexing member 5 that includes three longitudinal grooves 5a-5c.

[0080] The first and second rotary indexing members 5, 13 are shaped to interlock with one another by axially interpenetrating along the second longitudinal axis II-II when the first and second elements 3, 7 are in a penetrating orientation relative to one another about the second longitudinal axis II-II (FIG. 14). In the interlocked position, the first and second rotary indexing members 5, 13 prevent rotation of the first element 3 relative to the second element 7 about the second longitudinal axis II-II.

[0081] The first passage section 4a of the first element 3 is shaped so that, in its predetermined axial position, the ring 11 can pivot about the first longitudinal axis II up to a locking direction (FIG. 13) in which the first axial retaining member 6 opposes translational movement of the ring 11 towards the proximal end 3a of the first element 3.

[0082] In this case, the first passage section 4 a comprises an annular housing 28 having an inner diameter D 28 that is slightly larger than the outer diameter D 11 b of the ring 11 .

[0083] The first axial retention member 6 is in the form of a shoulder 6a in the first passage section 4a of the first element 3 (Figure 11). The ring 11 includes radial protrusions 11a-11c around its periphery, which are adapted to abut the shoulder 6a when the ring 11 is in the locking orientation.

[0084] 9, it can be seen that the first through passage 4 further includes a second passage section 4b extending substantially along the third longitudinal axis III-III. The second passage section 4b extends obliquely from the first passage section 4a such that the first and second passage sections 4a and 4b form a substantially non-zero angle A therebetween. The angle A allows the second passage section 4b to open in a direction away from the active portion (cuspid or free edge 3b) of the first element 3.

[0085] When assembled, the dental subassembly 1 and the first element 3 form a dental component 27 as shown in FIG.

[0086] The use of the dental subassembly 1 for fixing the first element 3 on the dental implant 2 is explained below with the aid of Figures 12 to 19.

[0087] During the first surgery, the practitioner places the dental implant 2 in the patient's mouth, in the patient's maxilla or mandible. The practitioner also places the second element 7 onto the dental implant 2, with its proximal end 7a penetrating into the inner housing 29 (FIG. 21). The proximal portion 70a of the second element 7 and the distal portion 29b of the inner housing 29 cooperate to rotate and index the second element 7 and the dental implant 2 relative to each other about the second longitudinal axis II-II. The first element 3 is held onto the dental implant 2 by a second screw 21 that engages with the internal threaded portion 29a and abuts the seat 20.

[0088] A first possibility is that the practitioner then mounts and fixes the healing part 25 onto the second element 7 by means of a third screw 23 that is screwed into a distal internal thread 22 formed in the cylindrical portion 17. The healing part 25 is also rotationally indexed on the second element 7 (by means of the radial protrusions 13a-13c of the second element 7) and is intended to remain in place during osseointegration of the dental implant 2 in the maxilla or mandible and during healing of the gums around the first element 3. Gum attachment then occurs around the second element 7, which is important for long-term preservation of the bone around the dental implant 2.

[0089] After healing, an impression can be made using an intraoral scanner, which then allows for the custom fabrication of the first element 3, for example by computer-aided design and manufacturing. During this design and manufacturing, the second through passage section 4b is positioned obliquely (substantially at angle A) relative to the first through passage section 4a, such that the second passage section 4b opens away from the active portion of the first element 3 (the canine or free edge 3b).

[0090] As an alternative to an intraoral scanner, one can resort to an impression-taking part that is intended to be overmolded with an impression-taking compound that is attached to the first element 3 and temporarily fixed therein instead of the healing part 25 .

[0091] According to another possibility, if the stability conditions of the dental implant 2 are sufficient when first installed, a temporary dental prosthesis may be manufactured and immediately fixed, comprising an inner tube 26a into which a commercially available standard dental prosthesis (e.g. made from a plastic material) can be attached and fixed.

[0092] By means of the inner tube 26a, the temporary dental prosthesis can also be rotationally indexed on the second element 7 (thanks to the radial projections 13a-13c of the second element 7) and is intended to remain in place during osseointegration of the dental implant 2 in the maxilla or mandible and during gingival healing around the first element 3. Gingival attachment then occurs around the second element 7, which is important for long-term preservation of the bone around the dental implant 2.

[0093] Once the first element 3 (shown in Figures 7 to 11) is manufactured, a second surgery is performed during which the practitioner mounts and fixes the first element 3 onto the dental implant 2 by means of the subassembly 1 according to the invention.

[0094] The practitioner begins by removing the third screw 23 , the second screw 21 , and the healing element 25 .

[0095] The practitioner then takes the first fixation screw 10 and inserts it into the ring 11 until the ring 11 is positioned between the first screw head 10a and the annular ring 10d. The ring 11 is then captured by the first fixation screw 10.

[0096] The radial protrusions 11a-11c on the ring 11 are positioned in a corresponding relationship with the longitudinal grooves 5a-5c of the first rotary indexing member 5 (FIG. 12), and then the practitioner inserts the ring 11 and the first screw head 10a into the first passage section 4a by axially translating the ring 11 along the first longitudinal axis II from the first proximal end 3a of the first element 3 (this movement is represented schematically by arrow 30 in FIG. 12) until the ring 11 reaches a predetermined axial position.

[0097] During this movement, the radial protrusions 11a-11c slide in the longitudinal grooves 5a-5c. At the end of the penetration, the ring 11 engages with the annular housing 28 at a predetermined axial position and is axially disposed over the shoulder 6a along the first longitudinal axis II.

[0098] The practitioner rotates the ring 11 about the first longitudinal axis II (e.g., by 1 / 6 of a turn) until the configuration shown in FIG. 13 is reached, where the radial protrusions 11a-11c are no longer in corresponding relationship with the longitudinal grooves 5a-5c but are in corresponding relationship with the shoulder 6a of the first axial retention member 6. The ring 11 is then in an (angular) locking orientation in which the locking means 12 (including the radial protrusions 11a-11c and the shoulder 6a) opposes translational movement of the ring 11 toward the proximal end 3a of the first element 3. In other words, the ring 11 is attached and axially fixed to the first passage section 4a and forms a screw seat for the first fixation screw 10, which is thus captured within the first element 3. A preliminary assembly is then obtained, consisting of the first element 3, the ring 11, and the first fixation screw 10.

[0099] When the ring 11 is pivoted in the locking direction, the radial bosses 19a-19c of the second friction means 19 rub against the side wall of the first passage section 4a, which has an inner diameter D4a that is slightly smaller than the outer diameter D19. The second friction means 19 reduces the risk of the ring 11 accidentally pivoting so that the radial protrusions 11a-11c return to their corresponding relationship with the longitudinal grooves 5a-5c.

[0100] In the next step, the practitioner attaches the preliminary assembly of Figure 13 (first element 3, first fixation screw 10 and ring 11) to the second element 7 (which is in the patient's mouth and engaged with the dental implant 2) as shown in Figures 14 and 18 to form a dental component 27 including the first element 3, first fixation screw 10, ring 11 and second element 7 (Figure 16).

[0101] To this end, the longitudinal grooves 5a-5c of the first rotary indexing member 5 are arranged in corresponding relation to the radial projections 13a-13c of the second rotary indexing member 13 about the first longitudinal axis II (which in turn coincides with the second longitudinal axis II-II). At the same time, the longitudinal slots 14a-14c of the third rotary indexing member 14 automatically move into corresponding relation with the longitudinal fins 15a-15c of the fourth rotary indexing member 15. The practitioner then drives the first element 3 onto the second element 7 (this movement is indicated by arrow 31) until the proximal end 3a of the first element 3 comes into abutment against the abutment surface 9 of the second element 7. During this movement, The longitudinal slots 14a-14c and the longitudinal fins 15a-15c are connected by axial interpenetration (FIG. 15). The longitudinal grooves 5a-5c and the radial projections 13a-13c are connected by axial interpenetration. The first friction means 16 (elastic ring 16a) comes to rub against a side wall portion of the first passage section 4a, which has an inner diameter D4a that is slightly smaller than the outer diameter D16a.

[0102] If the ring 11 were not in the locked angular orientation, the first rotary indexing member 5, the second rotary indexing member 13, the third rotary indexing member 14, and the fourth rotary indexing member 15 would form an axial abutment that would prevent the abutment surface 9 of the second element 7 from coming into axial abutment with the proximal end 3 a of the first element 3. More precisely, the following two situations can occur: - either the second element 7 and the ring 11 are in a penetration direction (Fig. 15) relative to each other about the second longitudinal axis II-II, in which case the first rotary indexing member 5 and the second rotary indexing member 13 form an axial abutment that prevents the abutment surface 9 of the second element 7 from coming into axial abutment against the proximal end 3a of said first element 3; - or the first element 3 and the second element 7 are in a penetration direction (Figure 14) relative to each other about the second longitudinal axis II-II, in which case the third rotary indexing member 14 and the fourth rotary indexing member 15 form an axial abutment (Figure 17) that prevents the abutment surface 9 of the second element 7 from coming into axial abutment with the proximal end 3a of the first element 3.

[0103] It can therefore be seen that if it is possible to abut the abutment surface 9 of the second element 7 against the proximal end 3 a of the first element 3, this is because the ring 11 is necessarily in the locking orientation and can therefore reliably function as a seat 20 for the first locking screw 10.

[0104] Furthermore, after the abutment surface 9 of the second element 7 is brought into abutment with the proximal end 3a of the first element 3, - the first rotary indexing member 5 and the second rotary indexing member 13 are in a coupled position that prevents rotation of the first element 3 relative to the second element 7 about the second longitudinal axis II-II; the third and fourth rotary indexing members 14, 15 are in a coupled position preventing rotation of the ring 11 relative to the second element 7 about the second longitudinal axis II-II;

[0105] Furthermore, the first friction means 16 (elastic ring 16a) opposes movement of the second element 7 away from said first element 3 along the first longitudinal axis II.

[0106] The overall result of this is that the ring 11 is fixed in a locked orientation relative to the first element 3 after assembly of the dental component 27 .

[0107] Once the dental component 27 is assembled, the practitioner then screws the first locking screw 10 into the internal thread 29a by means of a screwdriver tool (e.g., as described in document EP 2 607 722 A1) engaged through the second passage section 4b. The screwdriver head of the screwdriver tool comes into engagement with the six-sided female impression 10e of the first screw head 10a. When it abuts against the ring 11 forming the seat, the first screw head 10a holds the first element 3 and the second element 7 on the dental implant 2. This configuration is shown in FIG. 19.

[0108] The non-zero angle A allows the second passage section 4b to open in a direction away from the active part (canine or free edge 3b) of the first element 3. Nevertheless, it is possible to rely on the first passage section 4a (zero angle A) being aligned with the second passage section 4b in the absence of a collision with the active part (canine or free edge 3b) of the first element 3.

[0109] Whether angle A is zero or not, engagement of the first screw head 10a and ring 11 by the proximal end of the first element allows the second passage section 4b to have a cross-section sufficient to ensure access of a screwdriver tool to the first screw head 10a (and thus a smaller cross-section than would be required to pass a screw from the second passage section 4b through the first element 3 to the first passage section 4a, possibly along a curved path, if angle A is not zero), and therefore the first element 3 is stronger and there is less risk that its color will be affected by parts made translucent by the thin thickness of material.

[0110] Thereafter, if maintenance of the first element 3 is required, the practitioner removes the first fixation screw 10 and pulls out the first element 3, the ring 11 and the first fixation screw 10. The second element 7 can be left in the patient's mouth (so as not to unnecessarily disrupt the gingival attachment all around it) and can be covered with a healing portion 25 as in FIG. 21.

[0111] It has been previously described that the first component 3 is attached and secured to the second component 7 already in the patient's mouth to promote healing of the gums around the second component 7. The dental component 27 is then assembled in vivo.

[0112] Nevertheless, it is possible to carry out the healing phase by a different part than the second element 7. In this case, the dental practitioner may be supplied with a dental component 27 as shown in Figure 16, pre-assembled in vitro by an assembly process comprising the following steps: a) inserting the shank 10b of the first screw 10 into the ring 11; b) inserting the ring 11 and the first screw head 10a into the first passage section 4a by axial translation along the first longitudinal axis II from the proximal end 3a of the first element 3 so as to reach a predetermined axial position of the ring 11; c) pivoting the ring 11 about the first longitudinal axis II into a locking orientation; d) attaching the second element 7 to the proximal end 3a of the first element 3 by engaging the shank 10b of the first screw with the second through passage 8 until the abutment surface 9 of the second element 7 abuts the proximal end 3a of the first element 3.

[0113] Upon receiving the dental component 27, the practitioner simply places it on the dental implant 2 and screws it in place.

[0114] One aspect of the present invention relates to the object defined by the following clauses: A - A dental subassembly (1) for an individual prosthetic restoration of a tooth, shaped to be received on a dental implant (2), said dental subassembly (1) adapted to be assembled with a layered core-type or ceramic core-type first element (3), said first element (3) having a first through passage (4) including a first passage section (4a) extending from a proximal end (3a) of said first element (3) along a first longitudinal axis (II), said first element (3) including at least a first rotational indexing member (5) and a first axial retention member (6), said dental subassembly (1) comprising: - a second element (7) having a second through passage (8) extending along a second longitudinal axis (II-II), the second element (7) including an abutment surface (9) shaped to be able to receive in axial abutting engagement the proximal end (3a) of the first element (3), the second element (7) including a proximal end (7a) shaped to be able to abut axially against the dental implant (2) or to be able to penetrate into the dental implant (2); - a first locking screw (10) including a first screw head (10a) from which extends a first screw shank (10b) adapted to penetrate the second element (7), the first locking screw (10) being received in the second through passage (8) and having an external threaded portion (10c) shaped to be received by screwing into said dental implant (2), the first screw head (10a) being sized to allow it to be received by axially penetrating into the first passage section (4a) along the first longitudinal axis (II) from the proximal end (3a) of the first element (3); a ring (11) shaped to form a seat for the first screw head (10a) and to be mounted on the first element (3) by axially penetrating it along the first longitudinal axis (II) in the first passage section (4a) from the proximal end (3a) of the first element (3) to a predetermined axial position at which the locking means (12) can resist translational movement of the ring (11) in the direction of the proximal end (3a) of the first element (3); Including, Here, - said second element (7) comprises at least a second rotary indexing member (13) and a third rotary indexing member (14); - the ring (11) includes at least one fourth rotary indexing member (15); - the third rotary indexing member (14) and the fourth rotary indexing member (15) are shaped to couple by axially interpenetrating along the second longitudinal axis (II-II) when the second element (7) and the ring (11) are in a penetrating orientation relative to each other about the second longitudinal axis (II-II), so that in the coupled position the third rotary indexing member (14) and the fourth rotary indexing member (15) prevent rotation of the ring (11) relative to the second element (7) about the second longitudinal axis (II-II); - the first rotary indexing member (5) and the second rotary indexing member (13) are shaped to interlock by axially interpenetrating along the second longitudinal axis (II-II) when the first element (3) and the second element (7) are in a penetrating orientation relative to each other about the second longitudinal axis (II-II), so that in the coupled position the first rotary indexing member (5) and the second rotary indexing member (13) prevent rotation of the first element (3) relative to the second element (7) about the second longitudinal axis (II-II); - in its predetermined axial position, the ring (11) can pivot about the first longitudinal axis (II) in a locking direction in which the first axial retention member (6) opposes translation of the ring (11) towards the proximal end (3 a) of said first element (3); Dental subassembly (1). B - A dental subassembly (1) as described in clause A, wherein when the ring (11) is not in the at least one locking angle orientation, the first indexing member (5), the second indexing member (13), the third indexing member (14) and the fourth indexing member (15) form an axial abutment that prevents the abutment surface (9) of the second element (7) from coming into axial abutment with the proximal end (3a) of the first element (3). C - A dental subassembly (1) according to clause A or B, wherein the first friction means (16) enables a frictional fit of the second element (7) in the first element (3) that slows down the translational movement of the second element (7) away from the first element (3) along the first longitudinal axis (II). A dental subassembly (1) according to any one of clauses A to C, wherein the D-ring (11) is captured on the shank (10b) of the first screw. E - a third rotary indexing member (14) and a fourth rotary indexing member (15) - at least one longitudinal fin (15a-15c) on either the ring (11) or the second element (7), - on the other of the ring (11) or the second element (7), a cylindrical portion (17) having a tubular side wall (17a) including at least one longitudinal slot (14a-14c) adapted to receive said at least one longitudinal fin (15a-15c); The dental subassembly (1) of any one of clauses A to D, comprising: F - A dental subassembly (1) as described in clause E, wherein the at least one second rotary indexing member (13) includes radial protrusions (13a-13c) around the cylindrical portion (17) of the second element (7), the radial protrusions (13a-13c) being adapted to engage with the first rotary indexing member (5), which is itself in the form of longitudinal grooves (5a-5c) formed in the side wall of the first passage section (4a) of the first element (3), when the abutment surface (9) of the second element (7) receives the proximal end (3a) of the first element (3) in axial abutting engagement. G - A dental subassembly (1) according to clause F, the ring (11) comprises radial protrusions (11a-11c) around the periphery of the ring (11), the radial protrusions (11a-11c) being adapted to abut against a first axial retention member (6) when the ring (11) is in the locking orientation, the first axial retention member (6) being itself in the form of a shoulder (6a) in the first passage section (4a) of said first element (3); - the radial protrusions (11a-11c) are shaped in such a way that the ring (11) can slide axially in the longitudinal grooves (5a-5c) while penetrating axially into the first passage section (4a) of the first element (3); Dental subassembly (1). H - A dental subassembly (1) according to any one of clauses E to G, wherein on the second element (7), the radial protrusions (13a-13c) and the longitudinal slots (14a-14c) or longitudinal fins (15a-15c) are angularly offset relative to each other around the second longitudinal axis (II-II). I - A dental subassembly (1) according to any one of clauses A to H, wherein the ring (11) includes second friction means (19) adapted to slow the rotation of the ring (11) relative to the first element (3) about the first longitudinal axis (II) when the ring (11) is in the locked orientation. J - the second through passage (8) of the second element (7) a seat (20) for the head of a second screw (21) adapted to pass through the second element (7) and received in the second passage (8) to be screwed into the dental implant (2); - a distal internal thread (22) adapted to receive a third screw (23) enabling fixation of the temporary through-fixation element (24) to the second element (7); The dental subassembly (1) of any one of clauses A to I, comprising: K - at least one temporary through-fixing element (24), i.e. a healing portion (25) whose sidewall (25a) is shaped to at least partially contact the gums, and / or - an impression-taking part shaped to be scanned intraorally and / or overmolded with impression-taking compound, and / or - Temporary dental prostheses The dental subassembly (1) described in clause J, including: L - The dental subassembly (1) according to clause J or K, wherein the temporary through-fixation element (24) is rotationally indexed on the second element (7). M - a first element (3) for an individual prosthetic restoration of a layered core type or ceramic core type tooth, said first element (3) comprising a first through passage (4) comprising a first passage section (4a) extending from a proximal end (3a) of said first element (3) along a first longitudinal axis (II), said first element (3) comprising a first axial retention member (6); - a dental subassembly (1) onto which said first element (3) can be assembled, said dental subassembly (1) being shaped to be received on a dental implant (2), - a second element (7) including a second through passage (8) extending along a second longitudinal axis (II-II), the second element (7) including an abutment surface (9) shaped to be able to receive the proximal end (3a) of the first element (3) in abutting axial engagement, the second element (7) having a proximal end (7a) shaped to be able to abut axially against the dental implant (2) or to be able to penetrate into the dental implant (2); - a first locking screw (10) including a first screw head (10a) extending from a first screw shank (10b) adapted to penetrate the second element (7), and having an external threaded portion (10c) shaped to be received in the second through passage (8) and to be received by screwing into said dental implant (2), wherein the first passage section (4a) of the first element (3) is sized to allow the first screw head (10a) to be received by axial penetration along the first longitudinal axis (II) from the proximal end (3a) of the first element (3); a ring (11) shaped to form a seat for the first screw head (10a) and to be mounted in the first element (3) by axial penetration along the first longitudinal axis (II) in the first passage section (4a) from the proximal end (3a) of the first element (3) to a predetermined axial position at which the locking means (12) can resist translational movement of the ring (11) in the direction of the proximal end (3a) of the first element (3); Including, - said second element (7) comprises at least a second rotary indexing member (13) and a third rotary indexing member (14); - the ring (11) includes at least one fourth rotary indexing member (15); - the third rotary indexing member (14) and the fourth rotary indexing member (15) are shaped to couple by axially interpenetrating along the second longitudinal axis (II-II) when the second element (7) and the ring (11) are in a penetrating orientation relative to each other about the second longitudinal axis (II-II), so that in the coupled position the third rotary indexing member (14) and the fourth rotary indexing member (15) prevent rotation of the ring (11) relative to the second element (7) about the second longitudinal axis (II-II); Here, - said first element (3) comprises at least one first rotary indexing member (5); - the first rotary indexing member (5) and the second rotary indexing member (13) are shaped to interlock by axially interpenetrating along the second longitudinal axis (II-II) when the first element (3) and the second element (7) are in a penetrating orientation relative to each other about the second longitudinal axis (II-II), so that in the coupled position the first rotary indexing member (5) and the second rotary indexing member (13) prevent rotation of the first element (3) relative to the second element (7) about the second longitudinal axis (II-II); - the first passage section (4a) of the first element (3) is shaped in such a way that, in its predetermined axial position, the first axial retention member (6) allows the ring (11) to pivot about the first longitudinal axis (II) in a locking direction opposing translation of the ring (11) towards the proximal end (3a) of the first element (3); First element (3). N - The first element (3) as described in clause M, wherein when the ring (11) is not in the at least one locking angular orientation, the first indexing member (5), the second indexing member (13), the third indexing member (14), and the fourth indexing member (15) form an axial abutment that prevents the abutment surface (9) of the second element (7) from coming into axial abutment with the proximal end (3 a) of the first element (3). O - A first element (3) according to clause M or N, wherein the first friction means (16) allows for a frictional fit of the second element (7) in the first element (3), slowing down the translational movement of the second element (7) away from the first element (3) along the first longitudinal axis (II). P - A first element (3) according to any one of clauses M to O, wherein the first rotary indexing member (5) is in the form of a longitudinal groove (5a-5c) formed in the side wall of the first passage section (4a) of the first element (3), and the radial projections (13a-13c) forming the second rotary indexing member (13) of the second element (7) are engageable when the abutment surface (9) of the second element (7) receives the proximal end (3a) of the first element (3) in axial abutting engagement. Q - A first element (3) according to any one of clauses M to P, - the first axial retention member (6) is in the form of a shoulder (6a) in the first passage section (4a) of said first element (3); the ring (11) includes radial protrusions (11a-11c) around the periphery of the ring (11), the radial protrusions (11a-11c) being adapted to abut against the shoulder (6a) when the ring (11) is in the locking orientation; First element (3). R - The first element (3) of any one of clauses M to Q, wherein the first through passage (4) further comprises a second passage section (4b), the second passage section (4b) extending obliquely from the first passage section (4a) such that the first passage section (4a) and the second passage section (4b) form a non-zero angle (A) therebetween. S - A dental component (27) comprising a dental subassembly (1) according to any one of clauses A to L and a first element (3) according to any one of clauses M to R. T - A method for assembling a dental component (27) according to clause S in vitro, comprising: a) inserting the shank (10b) of the first screw (10) into the ring (11); b) inserting the ring (11) and the first screw head (10a) into the first passage section (4a) by axially translating the ring (11) along the first longitudinal axis (II) from the proximal end (3a) of the first element (3) so as to reach a predetermined axial position; c) pivoting the ring (11) about the first longitudinal axis (II) into a locked orientation; d) attaching the second element (7) to the proximal end (3 a) of the first element (3) by engaging the shank (10 b) of the first screw with the second through passage (8) until the abutment surface (9) of the second element (7) abuts the proximal end (3 a) of the first element (3); A method comprising:

[0115] The present invention is not limited to the explicitly described embodiments, but includes various modifications and generalizations thereof that fall within the scope of the following claims.

Claims

1. A dental subassembly for an individual prosthetic restoration of a tooth, shaped to be received on a dental implant, said dental subassembly being adapted to be assembled with a first element of the core type or ceramic core type on which layering is performed, said dental subassembly comprising: a second element having a second through passage extending along a second longitudinal axis, the second element including an abutment surface shaped to be able to receive said first element in axial abutting engagement, and a proximal end shaped to be able to abut axially against said dental implant or to be able to penetrate into said dental implant; a first locking screw including a first screw head from which extends a first screw shank adapted to pass through said second element, said first locking screw being received in said second through passage and having an external thread shaped to be received by screwing into said dental implant, said first screw head being sized to allow it to be received in said first element; a ring shaped to form a seat for the head of said first screw and to be mounted and held on said first element; Including, the second element includes at least one second rotary indexing member shaped to prevent rotation of the first element relative to the second element about the second longitudinal axis, and a third rotary indexing member; - said ring includes at least one fourth rotary indexing member; the third and fourth rotary indexing members are shaped to interlock by axial interpenetration along the second longitudinal axis when the second element and the ring are in a penetrating orientation relative to one another about the second longitudinal axis, such that in a coupled position, the third and fourth rotary indexing members prevent rotation of the ring relative to the second element about the second longitudinal axis; A dental subassembly comprising:

2. The dental subassembly of claim 1 , wherein the ring is captured on the shank of the first screw.

3. the third rotary indexing member and the fourth rotary indexing member: at least one longitudinal fin on either said ring or said second element; - on the other of said ring or said second element, a cylindrical portion having a tubular side wall including at least one longitudinal slot adapted to receive said at least one longitudinal fin; 3. The dental subassembly according to claim 1, comprising:

4. 4. The dental subassembly of claim 3, wherein said at least one second rotary indexing member includes a radial projection about the periphery of the cylindrical portion of said second element.

5. The dental subassembly of claim 4, wherein the ring includes a radial projection about the periphery of the ring.

6. 6. A dental subassembly according to any one of claims 3 to 5, characterized in that on the second element the radial protrusions and the longitudinal slots or longitudinal fins are angularly offset relative to each other about the second longitudinal axis.

7. The second through passage of the second element is a seat for the head of a second screw adapted to pass through said second element and received in said second passage to be screwed into said dental implant; a distal internal thread adapted to receive a third screw enabling fixation of a temporary penetrating fixation element to said second element; 7. A dental subassembly according to claim 1, comprising:

8. at least one temporary through-fixation element, namely: a healing part, the side walls of which are shaped to be at least partially in contact with the gums, and / or an impression-taking part shaped to be scanned intraorally and / or overmolded with an impression-taking compound, and / or - Temporary dental prostheses The dental subassembly of claim 7, comprising:

9. 9. Dental subassembly according to claim 7 or 8, characterized in that the temporary penetrating fixation element is rotationally indexed on the second element.

10. A dental component comprising: a first element for an individual prosthetic restoration of a layered core type or ceramic core type tooth, the first element comprising a first through passageway comprising a first passageway section extending from a proximal end of the first element along a first longitudinal axis, the first element comprising a first axial retention member; a dental subassembly onto which said first element can be assembled, said dental subassembly being shaped to be received on a dental implant; a second element including a second through passage extending along a second longitudinal axis, the second element including an abutment surface shaped to receive the proximal end of the first element in abutting axial engagement, the second element having a proximal end shaped to axially abut against or to penetrate into the dental implant; b) a first locking screw including a first screw head extending from a first screw shank adapted to penetrate the second element, the first locking screw being received in the second through passage and having an external threaded portion shaped to be threadably received into the dental implant, the first passage section of the first element being sized to allow the first screw head to be received by axial penetration from the proximal end of the first element along the first longitudinal axis; c) a ring shaped to form a seat for the first screw head and to be mounted within the first element by axial penetration along the first longitudinal axis in the first passage section from the proximal end of the first element to a predetermined axial position where a locking means can resist translational movement of the ring toward the proximal end of the first element; a dental subassembly including: Including, Here, - said second element comprises at least a second rotary indexing member and a third rotary indexing member; - said ring includes at least one fourth rotary indexing member; the third and fourth rotary indexing members are shaped to interlock by axial interpenetration along the second longitudinal axis when the second element and the ring are in a penetrating orientation relative to one another about the second longitudinal axis, such that in a coupled position the third and fourth rotary indexing members prevent rotation of the ring relative to the second element about the second longitudinal axis; - said first element comprises at least one first rotary indexing member; the first and second rotary indexing members are shaped to interlock by axial interpenetration along the second longitudinal axis when the first and second elements are in a penetrating orientation relative to one another about the second longitudinal axis, such that in an interlocked position, the first and second rotary indexing members prevent rotation of the first element relative to the second element about the second longitudinal axis; the first passage section of the first element is shaped such that, in its predetermined axial position, the first axial retention member allows the ring to pivot about the first longitudinal axis in a locking direction in which the first axial retention member opposes translational movement of the ring towards the proximal end of the first element; Dental components.

11. 11. The dental component of claim 10, wherein when the ring is not in at least one locked angular orientation, the first rotary indexing member, the second rotary indexing member, the third rotary indexing member, and the fourth rotary indexing member form an axial abutment that prevents the abutment surface of the second element from coming into axial abutment with the proximal end of the first element.

12. 12. A dental component according to claim 10 or 11, characterized in that first friction means enable a frictional fit of the second element in the first element that slows down translational movement of the second element away from the first element along the first longitudinal axis.

13. 13. A dental component according to any one of claims 10 to 12, characterized in that the first rotary indexing member is in the form of a longitudinal groove formed in a sidewall of the first passage section of the first element, and a radial projection forming the second rotary indexing member of the second element is engageable when the abutment surface of the second element receives the proximal end of the first element in axial abutting engagement.

14. - said first axial retention member is in the form of a shoulder in said first passage section of said first element; - the ring includes a radial protrusion around the periphery of the ring, the radial protrusion being adapted to abut the shoulder when the ring is in the locking orientation; Dental component according to any one of claims 10 to 13, characterized in that it

15. 15. The dental component according to any one of claims 10 to 14, wherein the first through passage further comprises a second passage section, the second passage section extending obliquely from the first passage section such that the first passage section and the second passage section form a non-zero angle therebetween.

16. 6. A first element for a layered core or ceramic core type individual prosthetic restoration of a tooth, shaped to be assembled onto a dental subassembly according to claim 5, the dental subassembly being itself shaped to be received on a dental implant, wherein: the first element includes a first through passageway including a first passageway section extending from a proximal end of the first element along a first longitudinal axis; - said first element includes a first axial retention member in the form of a shoulder forming an annular housing within said first passage section of said first element; - said first element includes at least one first rotational indexing member shaped to prevent rotation of said first element relative to said second element about said first longitudinal axis; the at least one first rotary indexing member being in the form of a longitudinal groove formed in a sidewall of the first passage section of the first element extending from the proximal end thereof and opening into the annular housing; First element.

17. 16. A method for assembling a dental component in vitro according to any one of claims 10 to 15, comprising the steps of: a) inserting the shank of the first screw into the ring; b) inserting the ring and the first screw head into the first passage section by axially translating the ring from the proximal end of the first element along the first longitudinal axis to reach the predetermined axial position; c) pivoting the ring about the first longitudinal axis into the locked orientation; d) attaching the second element to the proximal end of the first element by engaging the shank of the first screw with the second through passage until the abutment surface of the second element abuts the proximal end of the first element; A method comprising:

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