CN105982748B

CN105982748B - Penetration type multi-tooth prosthesis

Info

Publication number: CN105982748B
Application number: CN201610149492.XA
Authority: CN
Inventors: H·理查德
Original assignee: Anthogyr SA
Current assignee: Anthogyr SA
Priority date: 2015-03-17
Filing date: 2016-03-16
Publication date: 2020-01-17
Anticipated expiration: 2036-03-16
Also published as: FR3033692A1; JP6639286B2; FR3033693B1; CN105982748A; FR3033693A1; ES2672934T3; JP2016171997A; BR102016005945A2

Abstract

A pass-through multi-tooth prosthesis (1) intended to be attached and fixed to a plurality of dental implants by means of a plurality of pass-through screws (4), each having a stem (5) with a threaded portion (6) intended to be received in each dental implant by screwing. Each through-screw (4) is kept constrained in a respective hole (7) formed in the through-going multi-tooth prosthesis (1) and extending along a respective axial direction (I-I). Each through screw (4) is movable in rotation about the axial direction (I-I) of the respective hole (7) and in translation along the axial direction (I-I) of the respective hole between a retracted position and at least one screwing position. In the retracted position, the threads (8) of the threaded portion (6) of the through-screw (4) do not protrude from the respective hole (7).

Description

Penetration type multi-tooth prosthesis

Technical Field

The present invention relates to the field of dental implant, in particular to the treatment of teeth missing from the dental arch using a multi-prosthesis with a pass-through, which is intended to be attached and fixed to a multi-dental implant.

Background

The pass-through multi-prosthesis supported on an implant is intended to rest on the dental arch of a patient by being fixed to a plurality of dental implants implanted in the maxilla or mandible of the patient to form a plurality of dental prostheses. The prosthesis is fixed to the implant by means of fixing screws which pass through the prosthesis and each penetrate the respective implant, hence the expressions "through prosthesis" and "through screws". The prosthesis must be able to be removed when needed, for example for repair.

For reasons relating to mechanical stability, in particular to mechanical stability of the implant in the maxilla or mandible, the implant is oriented along axial directions which are inclined with respect to each other and generally with respect to the general surface of the dental arch.

Due to the oblique orientation of the implants relative to each other, an angular stake is typically used. The angular pile is an intermediate part intended to be attached to the implant in a first axial direction (corresponding to the longitudinal direction of the implant), having a cavity with an internal thread and being oriented in a second axial direction forming an angle with the first axial direction. The internally threaded cavity receives the through screw in a second axial direction. The use of foundation piles increases the number of components handled by the practitioner and greatly complicates the practitioner's work because the piles need to have precise heights, angles and orientations.

In addition, in order to ensure that the penetrating multi-tooth prosthesis fits properly in the mouth, and to allow the practitioner to check its fit prior to fixing, it is necessary to start with the step of placing the tooth prosthesis on the dental arch of the patient. During this placement, the patient opens his mouth as much as possible to allow the practitioner to insert the penetrating multi-tooth prosthesis into the patient's mouth by translation until it is placed on the patient's dental arch. The practitioner must then insert a different through-screw into the hole formed in the dental prosthesis. However, the through screws have very small dimensions, which makes it difficult to manipulate them. There is therefore a risk that the screw will fall out of the practitioner and into the patient's mouth, with the possibility that the patient will swallow it. This is the case, for example, in document EP 2223667 a1, which describes a through-going multi-tooth prosthesis according to the preamble of claim 1.

In order to limit the risks posed by the manipulation of the through-screws, the applicant has envisaged constraining the through-screws in holes formed in the dental prosthesis. Thereby, the through-screw is firmly connected to the dental prosthesis before introducing the dental prosthesis into the mouth of the patient. In this case, the threaded shaft of the through-screw protrudes at least partially and permanently under the dental prosthesis from the hole in which the through-screw is inserted. This permanent protrusion-together with the limited extent to which the mouth of the patient can be opened-creates a higher risk of interference between the threaded shaft of the screw and the dental implant when the practitioner introduces the penetrating multi-tooth prosthesis into the patient's mouth by translation to place it on the patient's dental arch. However, in the case of a conflict (by the threaded stem of the screw abutting against the implant), there is a risk that the thread of the through-screw (of very small dimensions) is damaged. A damaged through-screw can no longer be screwed into the dental implant aligned therewith, or it may be improperly screwed into the dental implant. A damaged through-screw may sometimes even break off when being screwed into a dental implant, or it may damage the internal threaded portion of the dental implant receiving the through-screw, which may be traumatic, since said dental implant has already been osseointegrated and it is almost impossible to take it out to remove the broken threaded portion of the through-screw or to replace the dental implant.

Document US 6,663,388B1 relates exclusively to a one-piece dental prosthesis and describes in particular the fixing of a dental post on a dental implant by retaining a fixing screw constrained in a hole of said dental post. The set screw permanently protrudes from the hole of the tooth stump.

Disclosure of Invention

One problem to be solved by the present invention is to allow an optimal and removable fixation of a penetrating multi-tooth prosthesis supported on an implant by means of a device connected to the implant, which limits the risks of manipulation by the practitioner and limits the risks of damage.

In order to achieve these and other objects, the present invention proposes a pass-through multi-tooth prosthesis intended to be attached and fixed to a plurality of dental implants by means of a plurality of pass-through screws, each having a stem with a threaded portion intended to be received in a respective dental implant by screwing; according to the invention:

each through-screw is kept captive (non-escapeable) in a respective hole formed in the through-going multi-tooth prosthesis and extending along a respective axial direction,

each constrained through-screw being movable in rotation around the axial direction of the respective hole and in translation along the axial direction of the respective hole between a retracted position and at least one screwing position,

in the retracted position, the threads of the threaded portion of the through-screw do not protrude from the respective hole in which the through-screw is held captive,

in the screwing position, the thread of the threaded portion of the through-screw at least partially protrudes from the respective hole in which the through-screw is held captive.

During introduction of the penetrating multi-tooth prosthesis into the mouth of the patient, if the penetrating screw collides with an obstruction formed by the dental implant (or the patient's adjacent teeth), the penetrating screw may move to the retracted position to avoid the obstruction. In practice, if the practitioner feels a slight resistance during introduction of the penetrating multi-tooth prosthesis into the mouth of the patient, which is a sign of possible conflict between the penetrating screw and the obstruction formed by the dental implant (or adjacent teeth), performing a gentle reciprocating translational movement with a low amplitude towards and away from the maxilla or mandible is sufficient to cause the penetrating screw to move to the retracted position, thereby overcoming the obstruction. The practitioner can then continue to introduce the penetrating multi-tooth prosthesis into the patient's mouth until the penetrating multi-tooth prosthesis is placed over the patient's dental arch.

Advantageously, it is possible to envisage:

the shank of each through-screw terminates in a distal centering portion which continues to extend from the threaded portion,

the distal centering portion has a cross section, the size of which decreases in a direction away from the threaded portion,

in the retracted position, the through-screw protrudes from the hole in which it is held captive via all or part of its centering portion.

This shape of the centering portion results in forces tending to move the through-screw towards its retracted position when laterally supported on an obstacle. In addition, such a centering portion makes it possible to correctly center the through-screw with respect to the dental implant in order to facilitate the correct screwing in the dental implant.

Preferably, the centering portion may be substantially conical or frusto-conical.

Advantageously, it is possible to envisage:

the thread of the threaded portion of the through-screw has a first threaded portion and has a second threaded portion which extends further from the first threaded portion up to the centering portion,

the first threaded portion has a constant outer diameter,

the second threaded portion has an outer diameter that decreases in the direction of the centering portion.

The second threaded portion, the outer diameter of which decreases in the direction of the centering portion, engages more gradually in the internal threaded portion of the implant aligned therewith.

Preferably, the thread of the threaded portion of the through screw may have at least two threads, preferably three threads. The practitioner will thus have to apply a small number of turns of screwing to the screw to ensure that it is engaged in the dental implant by the retention force therein having a value that is satisfactory. In addition, the process of screwing the through-screw is further shortened, so that it is engaged in the dental implant by the retention force therein having a value that is satisfactory, which makes it possible to further limit the axial dimension of the through-screw and to help the introduction of the dental prosthesis into the mouth of the patient.

In a first particular embodiment of the invention, it is advantageously possible to envisage:

the through-screw has a portion with a radial widening from which a through-screw portion extends, the through-screw portion having an outer cross-section with a smaller dimension than the dimension of the radial widening,

each through-screw is kept captive in its respective hole by a fixing which simultaneously:

at least partially engaged in an inner circumferential seat formed in a respective hole of the pass-through multi-tooth prosthesis,

below the radial widening and around the through-screw part, there is an outer cross section with a smaller dimension than the radial widening.

The screw thus has a very simple shape allowing the screw to be manufactured at low cost.

In this first particular embodiment of the invention, the translation of the through-screw between its retracted position and its screwing position is made possible by the fact that: the inner circumferential seat portion formed in the respective hole and/or the through-screw portion having an outer cross section whose dimension is smaller than that of the radially widened portion have a height in the axial direction greater than that of the portion of the fixing piece engaged in the inner circumferential seat portion.

In a first variant of the first particular embodiment of the invention, it is possible to envisage:

the fixing element is a retaining ring with a radial cut,

the inner circumferential seat is an annular groove extending radially with respect to the axial direction of the bore.

In a second variant of the first particular embodiment of the invention, it is possible to envisage:

the fixation member comprises an annular ring having rotational symmetry around a central axis and extending along the central axis between a proximal end and a distal end,

the fixing element comprises at least one corner section forming an arc between a first end connected to the distal end of the annular ring and a second free end,

said at least one corner section being movable, starting in part from its first end, in a transverse plane perpendicular to the central axis between a retracted position and at least one protruding position, and being elastically permanently returnable to the protruding position,

in the retracted position, said at least one corner section is comprised in the volume of a cylinder continuing the outer cylindrical surface of the annular ring,

in the protruding position, the second free end of the at least one corner section extends radially beyond the volume of the cylinder that continues the outer cylindrical surface of the annular ring.

In a second variant of the first preferred embodiment of the invention, it is advantageously envisaged that the inner circumferential seat has at least one angular groove portion extending radially with respect to the axial direction of the hole. Such an inner circumferential seat is particularly useful when the radially available space in the dental prosthesis for producing the inner circumferential seat is limited by certain radial dimensions.

Alternatively, the inner circumferential seat may be an annular groove extending radially with respect to the axial direction of the bore.

In a second particular embodiment of the invention, it is advantageously envisaged that the through-screws are rotationally mounted and translationally held in their respective holes by a compressible retaining ring, preferably compressible by radial cuts, which engages both in an outer circumferential groove formed on the through-screw and in an inner circumferential groove formed in the respective hole.

In this second particular embodiment of the invention, the translation of the through-screw between its retracted position and its screwing position is made possible by the fact that: the inner circumferential groove formed in the respective hole and/or the outer circumferential groove formed in the through-screw have a height in the axial direction that is greater than the height of the retaining ring engaged in the inner circumferential groove formed in the respective hole.

According to another aspect of the present invention, a dental implant is proposed, which extends between a distal connecting end intended to receive a penetrating multi-tooth prosthesis and a proximal anchoring end intended to be inserted into the maxilla or mandible of a patient, the dental implant comprising a blind internal bore leading to the distal connecting end and comprising a first internal threaded portion intended to receive a threaded portion of a penetrating screw; according to the invention, the first internally threaded portion extends from the aperture of the blind bore in the direction of the proximal anchoring end.

Such a dental implant forms a dental assembly in combination with a penetrating multi-tooth prosthesis as described above.

Since the first internally threaded portion extends from the bore of the blind bore in the direction of the proximal anchoring end, the overall length of the implant can be reduced such that it protrudes to a lesser extent when inserted into the patient's maxilla or mandible. This effectively limits the risk of interference with the through-going dental prosthesis, more particularly the through-going screws of the through-going multi-dental prosthesis. In addition, the overall length of the through-screw of the dental prosthesis can also be reduced, since such a large length is not required to be received in the dental implant by screwing, which further limits the risk of collision and damage.

Advantageously, the dental implant may have a screw seat having a non-circular cross-section and accessible from the aperture of the blind bore via the first internally threaded portion.

Preferably, the dental implant may have a second internally threaded portion accessible from the bore of the blind bore via the first internally threaded portion and the screw seat, and having a thread diameter smaller than the thread diameter of the first internally threaded portion. This second internally threaded portion may receive a screw for fixing another multi-or single tooth prosthesis, or even a tooth stump. The dental implant may thereby be adapted for multiple uses, which limits the number of implants that a practitioner needs to stock.

Drawings

Other objects, features and advantages of the present invention will become apparent from the following description of specific embodiments thereof, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a first embodiment of a pass-through multi-tooth prosthesis attached and fixed to a multi-dental implant;

FIG. 2 is a top view of the penetrating multi-tooth prosthesis of FIG. 1;

FIG. 3 is a cross-sectional view of the penetrating multi-tooth prosthesis of FIG. 1 on section A-A shown in FIG. 2;

FIG. 4 is a sectional view of the penetrating multi-tooth prosthesis of FIG. 1 on section B-B shown in FIG. 2;

figure 5 is a cross-sectional view of a first variant of a dental implant intended to receive the through-going multi-tooth prosthesis of figure 1;

FIG. 6 is a cross-sectional view of the penetrating multi-tooth prosthesis of FIG. 1, attached and secured to the implant of FIG. 5, at section A-A shown in FIG. 2;

FIG. 7 is a cross-sectional view of the pass-through multi-tooth prosthesis of FIG. 1 in a section C-C shown in FIG. 2 perpendicular to sections A-A and B-B;

FIG. 8 is a perspective view of the fixture used in the first embodiment of the through-going multi-tooth prosthesis;

figure 9 is a bottom view of the fixing of figure 8;

figure 10 is a top view of the fixing of figure 8;

figure 11 is a side view of a through screw used in the first embodiment of the through multi-tooth prosthesis;

figure 12 is a bottom view of the through-screw of figure 11;

FIG. 13 is a perspective view of the fixture used in the second embodiment of the through-going multi-tooth prosthesis;

figures 14 and 15 are cross-sectional views of a first variant of the second embodiment of the through-going multi-tooth prosthesis;

figures 16 and 17 are cross-sectional views of a second variant of the second embodiment of the through-going multi-tooth prosthesis;

figures 18 and 19 are cross-sectional views of a third variant of the second embodiment of the through-going multi-tooth prosthesis; and

figure 20 is a cross-sectional view of the penetrating multi-tooth prosthesis of figure 1 on section a-a shown in figure 2, attached and fixed to a second variant of the implant.

Detailed Description

Fig. 1 and 2 show a penetrating multi-tooth prosthesis 1 intended to be attached and fixed to dental implants 2 and 3 by means of a plurality of penetrating screws 4. The dental implants 2 and 3 are obliquely oriented with respect to each other.

Fig. 3, 4, 6 and 7 show a first embodiment of the dental prosthesis 1. In this embodiment, a through screw 4 as shown in fig. 11 and 12 is used. The through-screw has a shank 5 with a threaded portion 6 intended to be received by screwing in the dental implant 2 or 3 shown in more detail in fig. 5.

In fig. 3 and 4 it will be seen that the through-screw 4 remains constrained in a hole 7 formed in the through-going multi-tooth prosthesis 1 and extending along the axial direction I-I. The through-screw 4 is movable in rotation about an axial direction I-I and in translation along the axial direction I-I between a retracted position (fig. 3) and at least one screwing position (fig. 4).

In the retracted position (fig. 3), the thread 8 of the threaded portion 6 of the through-screw 4 does not protrude from the hole 7 in which the through-screw 4 is held.

In the screwing position (fig. 4), the thread 8 of the threaded portion 6 of the through-screw 4 at least partially protrudes from the hole 7 in which the through-screw 4 remains constrained. The protrusion of the thread 8 from the hole 7 allows the through-screw 4 to be received in the dental implant 2 or 3 shown in fig. 5.

The dental implant 2 or 3 extends between a distal connecting end 9 intended to receive the pass-through multi-tooth prosthesis 1 and a proximal anchoring end 10 intended to be inserted (by screwing or impaction) into the maxilla or mandible of the patient. The dental implant 2 or 3 comprises a blind internal bore 11 leading to the distal connecting end 9 and comprises a first internal threaded portion 12 intended to receive the threaded portion 6 of the through screw 4. The first internally threaded portion 12 extends from the bore 11a of the blind bore 11 in the direction of the proximal anchoring end 10. The dental implant 2 or 3 also has a screw seat 13 having a non-circular (e.g. polygonal) cross-section and accessible from the aperture 11a of the blind internal bore 11 via the first internally threaded portion 12. The dental implant 2 or 3 also has a second internal threaded portion 14 accessible from the bore 11a of the blind internal bore 11 via the first internal threaded portion 12 and the screw seat 13. This second internally threaded portion 14 has a smaller thread diameter than the thread diameter of the first internally threaded portion 12, so as to receive a fixing screw or through screw different from the through screw 4 shown in figures 11 and 12, to fix (directly or through a dental stump) a single or multiple dental prosthesis, which may or may not be of the through type.

As will be seen from fig. 11 and 12, the through-screw has a portion 15 with a radial widening 16 from which a through-screw portion 17 extends, which through-screw portion has an outer cross-section with a smaller dimension than the dimension of the radial widening 16. As will be seen from fig. 3 and 4, the through-screw 4 is held captive in the hole 7 by a fixing 18, which fixing 18 simultaneously:

at least partially engaged in an inner circumferential seat 19 formed in the hole 7 of the pass-through multi-tooth prosthesis 1,

below the radial widening 16 and around the through-screw portion 17, an external cross-section having a smaller dimension than the radial widening 16.

In order to allow the through-screw 4 to move between its retracted position and its screwing position, the through-screw portion 17 has a height H1 in the axial direction I-I, this height H1 being greater than the height H2 of the portion of the fastener 18 engaged in the inner circumferential seat 19 (fig. 4). Here, the height H1 is greater than the overall height H18 of the mount 18.

Alternatively or additionally, the inner circumferential seat 19 may have a height H3 in the axial direction I-I that is greater than the height H2.

The hole 7 has a void portion 70 which can receive at least a portion of the through-screw 4 in the retracted position.

Figures 8 to 10 show the fastener 18 used in figures 3 and 4 in more detail. In these figures, the fastener 18 includes an annular ring 20 having rotational symmetry about a central axis II-II and extending along the central axis II-II between a proximal end 20a and a distal end 20 b. The fixing element 18 comprises two

corner segments

21 and 22 forming an arc between a

first end

21a or 22a connected to the distal end 20b of the annular ring 20 and a second

free end

21b or 22 b. The

corner segments

21 and 22 can be moved, starting partly from their

first end

21a or 22a, between a retracted position and at least one protruding position in a transverse plane P1 perpendicular to the central axis II-II and can be elastically permanently returned to the protruding position. The retracted position is shown by the dashed lines in fig. 10 and the protruding position is shown by the solid lines in fig. 10.

In the retracted position, the

corner sections

21 and 22 are included in the volume of the cylinder C1 that is a continuation of the outer cylindrical surface of the annular ring 20. In the protruding position, the second free ends 21b and 22b of the

corner sections

21 and 22 extend radially outside the volume of the cylinder C1 that is a continuation of the outer cylindrical surface of the annular ring 20.

The

corner segments

21 and 22 of the fixture 18 are intended to be received in the inner circumferential seat 19 as shown in fig. 7, which fig. 7 is a cross-sectional view of the through-going multi-tooth prosthesis 1 along a section C-C perpendicular to the sections a-a and B-B shown in fig. 2.

As will be seen from fig. 7, the inner circumferential seat 19 has two

angular groove portions

23 and 24, which extend radially with respect to the axial direction I-I of the hole 7. As shown in fig. 4, the

corner slot portions

23 and 24 receive the

corner segments

21 and 22, respectively, to retain the fastener 18 in the bore 7.

Alternatively, this inner circumferential seat 19, intended to receive the fixing element 18 shown in fig. 8 to 10, may be an annular groove extending radially with respect to the axial direction I-I of the hole 7.

As an alternative to the fixing 18 shown in fig. 8 to 10, the through-screw 4 may be kept captive in the hole 7 by a fixing 18 shown in fig. 13, which is a retaining ring 25 which may be elastically compressed by a radial cut-out 26, as shown in fig. 13.

In the case of the use of a fixing element as shown in fig. 13, the inner circumferential seat 19 is partly in the form of an annular groove extending radially with respect to the axial direction I-I of the hole 7.

In a second embodiment of the through-going multi-tooth prosthesis 1 as shown in fig. 14 to 19, the through-screw 4 may be rotatably mounted and translationally held in the bore 7 by a compressible retaining ring 25 as shown in fig. 13. In this case, the retaining ring 25 can be radially compressed by means of the radial cut 26.

In fig. 14 to 19, the retaining ring 25 is simultaneously engaged in an outer circumferential groove 27 formed on the through-screw 4 and in an inner circumferential groove 28 formed in the hole 7.

In the first variant shown in fig. 14 and 15, the ability of the through-screw 4 to move in translation between its retracted position and its screwed position is permitted by the fact that: the inner circumferential groove 28 formed in the hole 7 has a height H4 in the axial direction I-I, which height H4 is greater than the height H5 of the retaining ring 25 engaged in the inner circumferential groove 28 formed in the hole 7.

In the variant shown in fig. 16 and 17, the ability of the through-screw 4 to move in translation between its retracted position and its screwed position is provided by the fact that: the outer circumferential groove 27 formed on the through-screw 4 has a height H6 in the axial direction I-I, which height H6 is greater than the height H5 of the retaining ring 25 engaged in the inner circumferential groove 28.

In the variant shown in fig. 18 and 19, the ability of the through-screw 4 to move in translation between its retracted position and its screwed position is provided by the fact that: the inner circumferential groove 28 and the outer circumferential groove 27 each have a height H4 and H6 in the axial direction I-I, these heights H4 and H6 being greater than the height H5 of the retaining ring 25 engaged in the inner circumferential groove 28.

In all the embodiments shown in the drawings, it will be seen that:

the rod 5 of the through screw 4 ends in a distal centering portion 29 behind the threaded portion 6,

the distal centering portion 29 has a cross section whose dimension decreases in a direction away from the threaded portion 6.

In fig. 3, 14, 16 and 18, in which the through-screw 4 is in the retracted position, it will be seen that the through-screw 4 protrudes from the hole 7 in which it is held captive via all or part of its centering portion 29. The threaded portion 6 of the through-screw does not protrude from the hole 7 to keep the threaded portion protected.

In fig. 14 to 19, the centering portion 29 is substantially conical, while it is substantially frustoconical in fig. 3, 4 and 11. Alternatively, a circular shape may be used.

As will be seen more specifically from fig. 11:

the thread 8 of the threaded portion 6 of the through-going screw 4 has a first threaded portion 61 and has a second threaded portion 62 which continues from the first threaded portion 61 and extends to the centering portion 29,

the first threaded portion 61 has a constant outer diameter D1,

the second threaded portion 62 has an outer diameter D2 which decreases progressively in the direction of the centering portion 29.

It will be seen from fig. 12 that the thread 8 of the threaded portion 6 of the through-going screw 4 has three

threads

8a, 8b, 8 c. The first internally threaded portion 12 (fig. 5) of the implant 2 or 3 has a corresponding number of threads.

It is clear that the implant 2 or 3 of fig. 5, together with its first internally threaded portion 12 extending directly (immediately) from the orifice 11a of the internal bore 11, constitutes a separate invention, the patent protection of which will be claimed. Such a dental implant 2 or 3 may have a reduced overall length, thereby limiting the risk of interference with the through-screw of the through-going dental prosthesis, especially since the arrangement of the first internally threaded portion 12 makes it possible to reduce the length of the through-screw.

In a first variant, shown in figures 5 and 6, the dental implant 2 or 3 is in one piece, the

upper end

2a or 3a of which is intended to pass at least partially through the mucosa.

In a second variant shown in fig. 20, the dental implant 2 or 3 is a two-piece, comprising a bone anchor portion 200 or 300 and a transmucosal extension 201 or 301. The transmucosal extension 201 or 301 has an

upper end

201a or 301a intended to pass at least partially through the mucosa.

The invention is not limited to the embodiments that have been explicitly described, but on the contrary it comprises different variants and general principles that are comprised within the scope of the appended claims.

Claims

1. A pass-through multi-tooth prosthesis (1) attached and fixed to a plurality of dental implants (2, 3), having a plurality of pass-through screws (4), each having a stem (5) with a threaded portion (6) intended to be received by screwing in a respective dental implant (2, 3), characterized in that:

-each through-screw (4) is kept constrained in a respective hole (7) formed in the through-going multi-tooth prosthesis (1) and extending along a respective axial direction (I-I),

-each constrained through screw (4) is capable of rotary movement about the axial direction (I-I) of the respective hole (7) and of translational movement along the axial direction (I-I) of the respective hole (7) between a retracted position and at least one screwing position,

-in the retracted position, the threads (8) of the threaded portion (6) of the through-screw (4) do not protrude from the respective hole (7) in which the through-screw (4) remains constrained,

-in the screwing position, the thread (8) of the threaded portion (6) of the through-screw (4) at least partially protrudes from the respective hole (7) in which the through-screw (4) remains constrained, wherein,

-the through-screw (4) has a portion (15) with a radial widening (16) from which extends a through-screw portion (17) having an outer cross-section of a smaller size than the radial widening (16),

-each through-screw (4) is kept constrained in a respective hole (7) by means of a fixing (18) which simultaneously:

at least partially engaged in an inner circumferential seat (19) formed in each hole (7) of the pass-through multi-tooth prosthesis (1),

an outer cross section below the radial widening (16) and around the through-screw part (17), the outer cross section having a smaller dimension than the radial widening (16),

the fixation member (18) comprises an annular ring (20) having rotational symmetry around a central axis (II-II) and extending along the central axis (II-II) between a proximal end (20a) and a distal end (20b),

-the fixing element (18) comprises at least one corner section (21, 22) forming an arc between a first end (21a, 22a) connected to the distal end (20b) of the annular ring (20) and a second free end (21b, 22b),

-said at least one corner section (21, 22) being movable, starting in part from its first end (21a, 22a), on a transverse plane (P1) perpendicular to the central axis (II-II) between a retracted position and at least one protruding position, and being elastically permanently returnable to the protruding position,

-in the retracted position, said at least one corner section (21, 22) is comprised in the volume of a cylinder (C1) which is a continuation of the outer cylindrical surface of the annular ring (20),

-in the protruding position, the second free end (21b, 22b) of said at least one corner section (21, 22) extends beyond the volume of the cylinder (C1) that is a continuation of the outer cylindrical surface of the annular ring (20).

2. The pass-through multi-tooth prosthesis (1) according to claim 1, characterized in that:

-the shank (5) of each through-screw (4) ends in a distal centering portion (29) which continues to extend from the threaded portion (6),

-the distal centring portion (29) has a cross section decreasing in size in a direction away from the threaded portion (6),

-in the retracted position, the through-screw (4) protrudes from the hole (7) in which it remains constrained via all or part of its centering portion (29).

3. The pass-through multi-tooth prosthesis (1) according to claim 2, wherein the centering portion (29) is substantially conical or frustoconical.

4. The penetrating multi-tooth prosthesis (1) according to claim 2 or 3, wherein:

-the thread (8) of the threaded portion (6) of the through-screw (4) has a first threaded portion (61) and has a second threaded portion (62) which extends further from the first threaded portion up to the centering portion (29),

-the first threaded portion (61) has a constant outer diameter (D1),

-the second threaded portion (62) has an outer diameter (D2) that decreases in the direction of the centering portion (29).

5. The penetrating multi-tooth prosthesis (1) according to claim 1, wherein the thread (8) of the threaded portion (6) of the penetrating screw (4) has at least two threads (8a-8 c).

6. Through-type multi-tooth prosthesis (1) according to claim 1, characterized in that the inner circumferential seat (19) formed in the respective hole (7) and/or the through-screw portion (17) having an outer cross-section with a dimension smaller than that of the radial widening (16) have a height (H3, H1) in the axial direction (I-I) which is greater (H3, H1) than the height (H2) of the portion of the fixture (18) engaged in the inner circumferential seat (19) to allow the through-screw (4) to translate between its retracted position and its screwed position.

7. The pass-through multi-tooth prosthesis (1) according to claim 1, wherein the inner circumferential seat (19) has at least one angular groove portion (23, 24) extending radially with respect to the axial direction (I-I) of the hole (7).

8. The pass-through multi-tooth prosthesis (1) according to claim 1, characterized in that the inner circumferential seat (19) is an annular groove extending radially with respect to the axial direction (I-I) of the bore (7).

9. A dental assembly comprising:

the pass-through multi-tooth prosthesis (1) according to claim 1,

-a dental implant (2, 3) extending between a distal connecting end (9) intended to receive the penetrating multi-tooth prosthesis (1) and a proximal anchoring end (10) intended to be inserted into the maxilla or mandible of a patient, the dental implant comprising a blind internal bore (11) leading to the distal connecting end (9) and comprising a first internally threaded portion (12) intended to receive the threaded portion (6) of the penetrating screw (4),

characterized in that the first internally threaded portion (12) extends from the aperture (11a) of the blind bore (11) in the direction of the proximal anchoring end (10).

10. Dental assembly according to claim 9, wherein the dental implant (2, 3) has a screw seat (13) having a non-circular cross-section and accessible from the aperture (11a) of the blind bore (11) via a first internally threaded portion (12).

11. Dental assembly according to claim 10, wherein the dental implant (2, 3) has a second internally threaded portion (14) accessible from the orifice (11a) of the blind bore (11) via the first internally threaded portion (12) and the screw seat (13) and having a thread diameter smaller than the thread diameter of the first internally threaded portion (12).