WO2017064377A1

WO2017064377A1 - Prosthetic assembly including an apparatus, implants and devices that provide the removable apparatus-implant link

Info

Publication number: WO2017064377A1
Application number: PCT/FR2016/000167
Authority: WO
Inventors: Claude Segura; Claude Bes
Original assignee: Claude Segura; Claude Bes
Priority date: 2015-10-16
Filing date: 2016-10-15
Publication date: 2017-04-20
Also published as: FR3042402B1; FR3042402A1

Abstract

The invention relates to a prosthetic assembly which includes: a) a dental apparatus provided with an implant-mucosa-supported structure (2); b) implants, screwed into the jawbone (4), of which each generally cylindrical head (3) comprises, on the periphery thereof, starting from the top, first a circular projection (31) and then an annular groove (32); and c) linking devices (1) intended for being inserted directly into the resin structure (2) of said dental apparatus and, in each case, removably connecting said apparatus to the head (3) of each of the facing implants. The device according to the invention is essentially characterised in that each linking device is formed by a single cap (1) which is interchangeable, integral, made of elastomer material, generally cylindrical and provided with an outer wall designed to be inserted directly into the resin structure (2) of the dental apparatus, and a recess (11) designed to removably receive the head (3) of the implant which is facing same.

Description

PROSTHETIC ASSEMBLY COMPRISING AN APPARATUS, IMPLANTS, AND DEVICES PROVIDING THE REMOVABLE CONNECTION IMPLANT APPARATUS

DESCRIPTION

FIELD OF THE INVENTION

The present invention relates to a prosthetic assembly comprising an apparatus provided with an implant-muco-supported structure, implants screwed into the bone of the jaw and devices adapted to be inserted directly into the resin structure of a dental appliance. and for releasably connecting each said apparatus to the head of each of the implants facing each other.

BACKGROUND BACKGROUND

Patent EP2315554 describes a device of the kind in question consisting of a rigid metal casing intended to be inserted into the resin structure of a dental appliance and an intermediate cap made of elastomeric material contained in said casing. , whose cavity is designed to provide removable retention of the device on the head of the intermediate anchor or directly on the head of the implant. This device, like that according to the invention, is applied to the head of an anchor or implant which has a head, of generally cylindrical shape, which comprises, at its periphery, starting from the top, first a circular protuberance and an annular groove.

In the patent cited above, the retention of the cap, including the housing, on the head of the implant or anchoring, is effected by a main means, located in the bottom of the cap, which is presented in the form of a central cylindrical protuberance configured to fit and clasp in a central housing provided on said head and by a secondary means which Clipper in the annular groove of said head.

Such a device has the following main disadvantages:

a) the first related to the implementation of the latter by the practitioner who must have:

- A first set of 3 caps, different physical characteristics, to cover the lack of parallelism existing between the implants of the same jaw and up to 20 ° maximum between the axes of implants, therefore anchors, concerned ( 10 ° with respect to the axis of insertion of the apparatus);

a second set of 4 caps, of different physical characteristics, to cover the lack of parallelism existing between the implants of the same jaw and this up to 40 "maximum between the axes of the implants, therefore of the anchors, concerned ( 20 ° with respect to the axis of insertion of the apparatus); resulting in the storage of a large number of caps (7 in total) to treat the different clinical cases encountered and the empirical choice of the cap or caps depending on the lack of parallelism existing between the pillars or implants belonging to the same jaw ;

b) the second related to the actual design of the device and its operation in the mouth which lead to premature wear and deterioration of the caps which have a small thickness (less than 0.5 mm) and which suffer a hardening effect irreversible due to masticatory pressures which, in physiological terms, exert lateral forces on Implants which compromise their stability and degrade osteo-lintegration (loss of bone turns or loss of the implant itself);

c) the third linked to the fact that the automatic correction of the parallelism defect takes place badly because of the main retention means, located in the bottom of the cap, which has the effect of blocking the oscillation thereof on the implant head, or anchoring, with the further consequence of further deterioration of said caps;

d) the fourth linked to the metal casing which fractures the resin structure of the dental appliance by levering lever effect resulting in the replacement of the apparatus;

e) the fifth linked to the microbial space existing between the cap and the housing, with consequent frequent cleaning of the apparatus;

all with consequences: a frequent return to the practitioner to perform either the cleaning of the device, the change of the or caps involved, or the replacement of the implant, or the replacement of the device, which is not without logistical and financial consequences.

Patent WO 97/20517 is also known which describes a prosthetic assembly comprising:

- the structure of a denture which is sealed on stubs and teeth, each of which is connected to said structure by means of an elastomeric membrane intended to maintain, on said structure, the tooth concerned and to allow it lateral movements and vertical crushing said membrane under the effect of masticatory efforts;

a protuberance of the structure, called a peg, intended to ensure the removable retention of the tooth on said structure, provided at its periphery, starting from the vertex, first a circumferential protuberance (essentially in the form of "8" ) then a retention groove. We are therefore in the field of non removable prostheses because fixed directly on stumps and of which only the teeth are mounted, unitarily, removably, on the structure of the device (or denture).

SUMMARY OF THE INVENTION

The invention aims to propose a prosthetic assembly applicable to the field of implant-muco-supported, removable prostheses, which is a totally different domain from that of the patent WO 97/20517 both in terms of the techniques of production (in the mouth and the prosthesis) that on that of the mechanical and physiological operation of the assembly and which does not have the drawbacks cited for the patent EP2315554.

This result was obtained by using a single cap, monolithic, easily interchangeable, almost indestructible, replacing the entire "casing-caps", capable of:

- to resist all insertions and disinsertiûns and masticatory efforts;

to ensure a good oscillation and a good elastic deformation with shape memory (in other words without strain-hardening) and consequently an automatic correction of the parallelism defect existing between the axes of the Implants belonging to the same jaw;

- not to weaken the resin structure of the dental appliances (lack of metal housing);

- no longer have microbial space;

- To fit and easily disengage the resin structure of the dental appliance with consequent consequent improvement in its interchangeability;

- Remove the main retention means, located in the bottom of the cap, which has the effect of blocking the oscillation thereof on the implant.

The prosthetic assembly according to the invention is of the type comprising;

a) a dental appliance provided with an Implanto-muco-supported structure;

b) implants, screwed into the bone of the jaw, each head of generally cylindrical shape has, at its periphery, starting from the top, first a circular protrusion and then an annular groove;

c) connecting devices intended to be inserted directly into the resin structure of said dental appliance and each removably connect said device to the head of each of the implants facing.

Said assembly is essentially characterized in that each connecting device is produced by means of a single cap, interchangeable, monolithic, material elastomer, of generally cylindrical shape, provided with an external wall configured to be housed directly in the resin structure of the dental appliance and a cavity configured to removably accommodate the head of the implant which is opposite;

in that the cavity of the cap is provided, starting from its opening:

- First, a circular protrusion designed to retract, by compressive deformation, during the passage of the circular protuberance of the head of the implant and to redeploy, in the manner of a clip, in the annular groove said head; - Next, a circular groove designed to accommodate retentively and oscillating, the circular protuberance of said head;

and in that :

a) the thickness of the side walls of the cap is chosen in the range of values between 1 and 2 mm so as to automatically absorb, by deforming pressure of said walls during the vertical insertion of the dental appliance, the defect of parallelism existing between the axes of the implants associated with said apparatus, in a range of possible inclinations of said implants with values between 0 and 30 ° with respect to the vertical axis of insertion of said apparatus;

b) the thickness of the bottom, or ceiling, of the cap is chosen in the range of values between 1 and 2 mm so as to absorb, by deforming pressure dudït bottom. or ceiling, vertical masticatory pressures and to maintain the Implanto-muco-supported support of the apparatus and to generate and trigger the proprioceptive reflex that controls and limits the masticatory pressure on the implants;

c) the circular groove of the cap has a depth whose value is chosen in the range of 0.4 to 0.7 mm so as to obtain a retention force of the circular protuberance of the implant head in said throat, of value between 400 and 900 grams to ensure sufficient retention of the device in the mouth and easy disinsertlon;

d) the constituent material of the cap is polyurethane whose hardness is chosen in a range of values between 50 and 90 Shores so as to obtain, in optimal cooperation, the aforementioned characteristics and to guarantee in time the durability of said cap .

The cap has, at its periphery, at least one retention groove.

The design and implementation of the invention as well as the aims pursued and the results obtained do not seem to follow clearly from the cited prior art. and above all do not seem to be able to be directly and simply transposable from the prior art.

Indeed, the focus has been on:

the combination of characteristics such as the automatic absorption of the parallelism defect existing between the implants in a range of inclinations of 0 to 30 ^e and the retention force of between 400 and 900 grams;

- the cooperation, with the said characteristics, those related to the thickness of the walls and the choice of the material (good hardness to avoid wear and good shape memory to avoid hardening and therefore the replacement of the cap,,.,) ;

- Obtaining Implanto-muco-supported support of the device so as to generate and trigger the propioceptlf reflex that controls and limits the masticatory pressure on the implants;

- the disinsertlon and the insertion of the device, as many times as necessary, for reasons of hygiene, even of intervention on the implants, without having to decelerate the apparatus with the interventions and the risks that it involves;

- the protection of the armature of the device which is no longer weakened.

RESENTATION OF FIGURES

The features and advantages of the invention will appear more clearly on reading the detailed description which follows of at least one preferred embodiment thereof given by way of non-limiting example and shown in the accompanying drawings.

On these drawings:

- Figures 1 to 4 show, in longitudinal section, the cap according to the invention associated with a pillar or implant of the type described and in 4 phases to highlight the deformation of the wall and the protrusion of the cap in insertion course of the implant head or anchor and the final position of said head;

^"Figure 5 shows two monolithic implants provided with heads according to the invention (or traditional screw connections provided with heads according to the invention) positioned in the same jaw (partially and symbolically bounded by dotted thin lines) of a patient , at opposite extreme inclinations, ie 30 ^e relative to the vertical axis (A) of insertion of the same apparatus (whose resin structure is delimited partially and symbolically in fine dashed lines).

DETAILED DESCRIPTION OF THE INVENTION

The prosthetic assembly according to the invention (FIGS. 1 to 4) comprises:

a) a dental appliance provided with an implant (2) implant-muco-supported; b) Implants, screwed into the bone of the jaw (4), each head (3), of generally cylindrical shape, comprises, at its periphery, starting from the top, first a circular protrusion (31) then an annular groove (32),;

c) connecting devices (1) intended to be inserted directly into the resin structure (2) of said dental appliance and each removably connect said apparatus to the head (3) of each of the implants facing each other.

According to the basic characteristics of the invention, taken in combination:

a) each connecting device is produced by means of a single cap (1), interchangeable, monolithic, of elastomeric material, of generally cylindrical shape, provided with an outer wall configured to be housed directly in the resin structure (2 ) the dental apparatus and a cavity (1 1) configured to removably accommodate the head (3) of the implant facing it;

b) a cavity (1 1) of the cap (1) is provided, starting from its opening:

first, a circular protuberance (12) designed to retract, by compressive deformation, during the passage of the circular protuberance (31) of the head (3) of the implant and to redeploy, in the manner a clip in the annular groove (32) of said head (3);

- Next, a circular groove (13) designed to accommodate, retently and oscillating, the circular protuberance (31) of said head (3);

c) the thickness of the side walls of the cap (1) is chosen in the range of values between 1 and 2 mm so as to automatically absorb, by deforming pressure of said walls during the vertical insertion of the dental appliance, the lack of parallelism existing between the axes of the implants associated with said apparatus, in a range of possible inclinations of said implants with values between 0 and 30 ° with respect to the vertical axis (A) of insertion of said apparatus;

d) the thickness of the bottom, or ceiling, of the cap (1) is chosen in the range of values between 1 and 2 mm so as to absorb, by deforming pressure of said bottom, or ceiling, vertical masticatory pressures and maintain the implant-muco-supported support of the device and generate and trigger the proprioceptive reflex that controls and limits the masticatory pressure on the implants;

e) the circular groove (13) of the cap (1) has a depth whose value is chosen in the range of 0.4 to 0.7 mm so as to obtain a retention force of the circular protuberance (31) of the head (3) of the implant in said groove, of between 400 and 900 grams in order to ensure sufficient retention of the device in the mouth and easy disinsertion; f) the constituent material of the cap (1) is polyurethane whose hardness is chosen in a range of values between 50 and 90 Shores so as to obtain, in optimal cooperation, the aforementioned characteristics and to guarantee over time the durability of said cap.

The cap (1) has, at its periphery, at least one retention groove (14).

FIG. 5 shows two monolithic implants (or traditional screw anchors) positioned in the same jaw (4) of a patient, in opposite extreme inclinations, ie 30 ° with respect to the vertical insertion axis (A). of the same device (2), in order to highlight the deformation properties that must have the caps, integrated in said device, to be inserted on the heads of the implants (or anchors), according to the invention, in the range maximum inclination of said implants (and therefore anchors) knowing that the axis (X) of the caps, once they are nested on the heads of the implants (or anchors), is in line with that of the implants.

In this figure, the features opposite represent:

- For the dental appliance, the bottom (21) of the cavity of the resin structure (2) in which are housed the caps;

- For the jaw, the crest (41) of the gum that will be capped by the resin structure (2) of said apparatus.

As an indication, the cap may have dimensions:

an average outside diameter of between 4 and 6 mm;

an average internal diameter of between 3 and 3.50 mm for the portion intended to house the cylindrical head of the abutment or implant);

The device according to the invention can be associated with:

- at the head of an implant screwed directly into the jawbone;

- at the head of a pillar screwed into an implant;

- either at the head of a pillar or intracoronary attachment (machined or calclnable) secured to the root of a tooth.

In the preferred embodiment of the invention, it is polyurethane, in the thermoplastic form, which has been chosen because it makes it possible to meet these various requirements, any other type of material having the same properties that may be suitable.

The implant used may be made of titanium, zirconia or any other material.

Of course, those skilled in the art will be able to carry out the invention as described and represented by applying and adapting known means without it being necessary to describe them or to represent them.

Claims

1- A prosthetic assembly comprising:

a) a dental appliance provided with an implant (2) implant-muco-supported;

b) implants, screwed into the bone of the jaw (4), each head (3) of generally cylindrical shape has, at its periphery, starting from the top, first a circular protrusion (31) then an annular groove (32),;

c) connecting devices (1) intended to be inserted directly into the resin structure (2) of said dental appliance and each removably connect said appliance to the head (3) of each of the implants opposite;

characterized in that each connecting device is made by means of a single cap (1), interchangeable, monolithic, of elastomeric material, of generally cylindrical shape, provided with an outer wall configured to be housed directly in the resin structure (2) the dental apparatus and a cavity (11) configured to removably accommodate the implant head (3) facing it;

in that the cavity (11) of the cap (1) is provided, starting from its opening: "first, with a circular protuberance (12) designed to retract, by compressed deformation, during the passage of the circular protrusion (31) of the head (3) of the Implant and to redeploy, in the manner of a clip, in the annular groove (32) of said head (3);

and in that :

a) the thickness of the side walls of the cap (1) is chosen in the range of values between 1 and 2 mm so as to automatically absorb, by deforming pressure of said walls during the vertical insertion of the dental appliance, the lack of parallelism existing between the axes of the implants associated with said apparatus, in a range of possible inclinations of said implants with values between 0 and 30 ° with respect to the vertical axis (A) of insertion of said apparatus;

b) the thickness of the bottom, or ceiling, of the cap (1) is chosen in the range of values between 1 and 2 mm so as to absorb, by deforming pressure of said bottom, or ceiling, the vertical masticatory pressures and maintain implant-supported mucosal support * and generate and trigger the proprioceptive reflex that controls and limits the masticatory pressure on the implants;

c) the circular groove (13) of the cap (1) has a depth, the value of which is chosen in the range of 0.4 to 0.7 mm so as to obtain a retention force of the circular protuberance (31) the head (3) of the implant in said groove, value between 400 and 900 grams to ensure sufficient retention of the device in the mouth and its easy disinsertion;

d) the constituent material of the cap (1) is polyurethane whose hardness is chosen in a range of values between 50 and 90 Shores so as to obtain, in optimal cooperation, the aforementioned characteristics and to guarantee in time the durability of said cap.

2. The assembly according to claim 1, characterized in that the cap (1) has, at its periphery, at least one retention groove (1).