CH701435A2 - Fixed dental prosthesis for replacing missing tooth, has sections arranged such that relative position of artificial tooth and splint is chosen to enable bars to occupy intratooth position in abutment teeth, when bars are placed in recesses - Google Patents

Abstract

The prosthesis has a connection unit to rigidly connect an artificial tooth (15) to natural abutment teeth. The unit has four sections formed by middle prosthetic plates (5, 6) and retention bars (3, 4), and a median section (7) fixed on both sides of the plates. The sections are arranged relative to one another such that relative position of the artificial tooth with respect to a periodontal splint is chosen to enable the bars to occupy an intratooth position in the abutment teeth, when the bars are subsequently placed in recesses forming occlusal-proximal cavities in the abutment teeth.

Description

Technical area

The present invention relates to a fixed dental prosthesis.

Prior art

There are many techniques in dental medicine to replace missing teeth, in order to maintain a functional and aesthetic dental arch. When there are teeth on the arch, these are pillars on which it is possible to support to retain and stabilize the prosthesis. It is called a fixed prosthesis when the prosthesis is not intended to be removed and put back into the mouth by the patient himself.

[0003] Fixed prostheses are those that will most resemble the natural state. These are also the most expensive solutions because they require a great time of preparation in the mouth by a qualified dentist with a specific training. These solutions also give rise to significant laboratory costs. To make a fixed prosthesis between natural pillars, or a cantilevered extension supported on pillars, it is necessary to prepare the pillars to fix an anchor. An alternative anchoring consists in making a crown for each of the pillars, another variant consists in setting up "in / onlays" in the pillars, a third variant consists in gluing an applique in a generally lingual position on the pillars, by ex. "Maryland Bridge".

When the pillars are primed, according to one of the variants mentioned, it can be made in one piece and pouring the reinforcement of the anchors and the metal part of the prosthetic element that will support the replaced tooth or teeth either individually realize several separate parts, which are then welded together.

In one case as in the other, full casting or welding, it is necessary that the insertion axes relative to each prepared pillars are compatible, which is very demanding and represents a great difficulty, requiring a lot of attention. experience and practice to be mastered. In addition, when this operation is performed, whether by casting or welding, it is excluded to think about folding or deforming the armature of the prosthesis. If by chance the insertion axes are not what they should be, especially if the frame can not fit fully and simultaneously on the pillars, we can at best only grind the pillars or cut the frame to weld it back to a better position. The impossibility of bending, bending or warping the armature, respectively the prosthesis, is very penalizing and it is partly in order to remedy this aspect that the present invention was born.

The axes of the pillars can also be simply incompatible, because too divergent. We then retain an embodiment in two elements, which will not be welded, but secured by means of a slide. In this hypothesis, not only the dentist must be trained and practiced, but the same goes for the laboratory technician for whom this operation is always a challenge. The solution of fixed prostheses is in itself expensive, but it also has the potential for a serious increase in cost because of the difficulty of implementation.

The variants of the state of the art briefly recalled above have, to more or less pronounced degrees, a major drawback which is their cost. Indeed, they consume all a considerable time of realization, that must devote the dentist, the prosthetist, and most often both. We think less about it, but we must also take into account the fact that the patient also spends a lot of time on his treatment and that it has a cost. Finally, when crowns must be made on healthy teeth in order to fix a prosthesis, mutilation heavy teeth in good condition objectively remains a waste.

Purpose of the invention

The object of the present invention is to provide a family of prostheses whose characteristics allow three things, without loss of performance compared to the state of the art. In the first place, a substantial reduction in the cost of implementation. In the second place, a better ease and security of realization thanks to a lesser degree of sophistication or technicality. And third, an improved reversibility.

For this purpose, the present invention relates firstly to a fixed dental prosthesis comprising at least one artificial tooth and means for securing it with at least two natural abutment teeth of the mouth, characterized in that said means are consisting of five distinct sections, namely two retention bars intended to be anchored in the pillar teeth each constituting a section, two intermediate prosthetic plates, each constituting a section, each fixed at the end of one of the retention bars and finally a median section intended to receive and carry the artificial tooth (s) (s), said median section being fixed on the one hand and the other to the one and the other of the intermediate prosthetic plates, the various sections together forming a periodontal splint and being arranged relative to each other so that the relative position occupied by the tooth (s) artificial (s) relative to the splint on which it (s) is (are) fixed (s) is chosen so that each of the two retention bars can occupy, in the associated pillar tooth, a position intra -dental; when the two retention bars of the prosthesis are subsequently placed in housings forming two occluso-proximal cavities, housing also provided for this purpose in each of the natural abutment teeth.

Still for this purpose, the present invention also relates secondly to a fixed dental prosthesis comprising at least one artificial tooth lying in extension, or in cantilever, and means of securing it with at least one natural abutment tooth of the mouth, characterized in that said means consist of three distinct sections, namely a first section consisting of a retention bar intended to be anchored in one or more abutment teeth, a second section consisting of a intermediate prosthetic plate fixed at the end of the retention bar and a third cantilevered section fixed to the intermediate plate and being intended to receive and carry the artificial tooth (s), the three sections together forming a periodontal splint and being arranged relative to one another so that the relative position of the artificial tooth (s) relative to the the splint on which it (they) is (are) fixed is chosen so that the retention bar can occupy, in the (or) tooth (s) pillar (s) associated with it, a position intra-dental; when the retention bar of the prosthesis is subsequently placed in an occluso-proximal cavity housing, housing otherwise provided for this purpose in the (the) tooth (s) pillar (s) natural (s).

Description of the invention

The following description refers to the drawing in which: <tb> fig. 1 <sep> is a view from above (a) and from side (b) presenting the essential elements of the prosthesis according to the invention; <tb> fig. 2 <sep> is a view from above (a) and from side (b) presenting the essential elements of the prosthesis according to the invention once assembled; <tb> fig. 3 <sep> is a perspective view of a detail of the essential elements of the prosthesis according to the invention. <tb> Fig. 4 <sep> shows three possibilities of preparing a pillar tooth intended to accommodate a retention bar of the prosthesis according to the invention. <tb> Fig. <Sep> consists of two profile views of the prosthesis according to the invention. <tb> Fig. 6 <sep> is a view from above a) and from side b) of a detail of the assembly of two sections of the prosthesis according to the invention by means of an additional element. <tb> Fig. 7 <sep> illustrates the prosthesis according to the invention, provided with a transfer guide. <tb> Fig. 8 <sep> shows a board having, viewed from the side, a cantilever variant of the prosthesis according to the invention. <tb> Fig. 9 <sep> shows a board having, viewed from above, a cantilever variant of the prosthesis according to the invention.

In FIG. 1, a first pillar tooth 1 is recognized, as well as two second pillar teeth 2 and 2. It would have been possible to illustrate a presentation having simply two abutment teeth framing a missing tooth, but as the invention is not limited to this configuration, it was preferable to illustrate from the start a field a little more complex.

It also recognizes two retention bars 3 and 4 made of a dental grade metal for permanent implantation. Each of these two bars constitutes a portion of the prosthesis.

We can also see the two intermediate prosthetic plates 5 and 6, also made in a dental grade metal for permanent implantation. Each of these two intermediate plates constitutes a section of the prosthesis.

Finally, we can see the fifth and last section of the prosthesis according to the invention, that is to say the section intended to accommodate and wear the artificial tooth. This section 7 is here symbolized by three segments of dental wire whose ends will be, as will be seen later, secured to the intermediate plates.

We find in fig. 2the elements described in connection with Figure 1.

By more specifically observing FIG. 2b), it can be seen that the two retention bars 3 and 4 are roughly in the extension of one another. Thus, it is actually possible to use a single retention bar on which one could directly build or fix an artificial tooth, which is also an excellent and very economical solution. However, in such a case, the artificial tooth would consist of a lot of material below the single bar, and quite a bit of material above, the retention bar being located in the upper third of the abutment teeth, and by consequence of the artificial tooth too.

It is exactly here that the present invention intervenes whose motivation is to retain the advantages of attachment to the pillars through the use of bar (s) of retention, and to provide in addition the possibility of attach the artificial tooth to the prosthesis frame using far more than the upper third of the artificial tooth.

In FIG. 3, there are the respective proximal ends of the retention bars 3 and 4, ends to which are fixed the intermediate plates 5 and 6 which are here represented in the form of escutcheons. The exact shape of the plates does not matter much, they can have a different shape (as far as compatible with each other) within the same prosthesis.

The connection between a bar and a plate can be achieved by welding, by thickened welding, or by means of a patch in the case where the dentist deems it necessary to practice boxing in the abutment tooth. We return in more detail on this aspect further.

Still facing FIG. 3, it is observed that each of the two intermediate plates 5 and 6 is provided with three sockets 8, intended to facilitate the positioning and fixing of dental metal son 9, the number of which is consistent with that of the sockets.

The number and position of the son 9, and therefore groups of sockets 8, may be left to the discretion of the user. Nevertheless, the combination illustrated in FIG. 3, that is to say, two upper and one lower threads, is interesting in that the two upper threads are primarily resistant to the depression due to chewing, while the lower thread fights rather the implementation. rotation of the artificial tooth.

The reader easily understands that, from the moment when the median section is made by means of one or more rigid and integral elements of the two plates, the number, the shape and the arrangement of said rigid elements do not change the principle. constructive. We therefore refrain from illustrating or commenting innumerable combinations or variants applying the same principle with some nuances of style. What is shown in fig. 3 is indicative and is in no way limiting. We can do the same thing differently.

In FIG. 4, we observe in the three cases a, b and c, that a pillar has been primed in a very elementary way since we have only practiced an occluso-proximal cavity, which represents the simplest exercise that can be learned a dental student. It is noted in passing that in all three cases, the cavities are made at a point in the tooth that is often already damaged by the presence of a filling. This is often the opportunity not to touch the healthiest parts of the abutment teeth.

The pillar tooth illustrated in FIG. 4are the most elementary primer, the size of the cavity being simply related to the expected dimensions of the retention bar to be implanted, this taking into account the additional volume necessary for the introduction of a compact mass of glass ionomer and / or composites (white obturating) intended to seal the bar in the tooth.

The abutment tooth illustrated in FIG. 4b was primed as in the case of fig. 4a, but with creation of a box 10, while in FIG. 4c, this is a flared box 11.

The boxes 10 and 11 of Figure 4constituent, regardless of any occluso-proximal cavity, a technique taught in dentistry to close proximal caries. This step is therefore well mastered, even if the purpose in which it is used here has nothing to do with the cause of teaching.

Fig. 5 is to be related to FIG. 2, which she retains the provision and context. Fig. 5a illustrates the stripped-down embodiment, with plates 5 and 6 simply welded to the retention bars 3 and 4. In contrast, FIG. 5b shows that, to cooperate with the pillar teeth 2 and 2, the connection between the retention bar 3 and the intermediate plate 5 is achieved through a thickened weld 12. This same fig. 5b shows the opposite that, to cooperate with the abutment tooth, the connection between the bar 4 and the intermediate plate 6 uses an additional element described below, and housed in a box 13 formed in a pillar tooth.

In the two illustrations of FIG. 5, the median section 7, materialized by metal wires, is shown provided with an artificial tooth 15.

Before dwelling on FIG. 6, it is good to return briefly to illustrations b and c in fig. 4, which has been explained to correspond to two known variants of boxes, simple and flared.

Indeed, the reserves 10 and 11 illustrated in FIG. 4, which widen the end of the cavity, are used to accommodate an additional element which is inserted between a retention bar and its intermediate plate.

In FIG. 6, the aforementioned additional element 14 consists of a generally rectangular section of metal section, welded on the one hand to the intermediate plate 5 and on the other hand to the retention bar 3. Also shown in this figure sockets 8. The dimensions of the additional element 14 are chosen to cooperate harmoniously with those of the boxes, the reality being that the size of the boxes is adapted to that of the additional element that one wishes to use.

The introduction of an additional element provides more stability and resistance to rotation.

In general, an extreme variety is offered in the choice of the shape of the retention bar of the prosthesis according to the invention. The most diverse sections can be used in the search for the same goal, namely to increase the grip of the bar vis-à-vis the abutment tooth. A bar of circular section whose surface would be smooth is disadvised, except in the case where an additional element 14 is provided, because it is then this element that will ensure resistance to rotation.

Note that it is often necessary to bend, bend or warp the retention bar and, thanks to the elements of the invention, nothing limits the ability to give the retention bar its ideal shape according to the needs of each case.

In terms of the concrete realization of the prosthesis, we can perfectly choose artificial teeth prefabricated, such as there is a wide range on the market. It will also always be possible to completely make an artificial tooth in the laboratory as is customary, which will offer more possibilities to match the artificial tooth to the rest of the dentition, but will also increase the cost of implementation.

The realization of the prosthesis according to the invention of course requires, upstream as downstream, that the dentist performs the necessary gestures, which are part of the logical sequence described below.

To begin, the dentist has the choice between two approaches when the upstream phase. Either the dentist starts, by means of his well-known instruments to make the cavities in the abutment teeth 1 and 2 (respectively 2 and 2), then he takes an impression. Either the dentist starts by taking an impression, in which case the cavities are made in the laboratory in the model resulting from the impression (these cavities will in this case be replicated in the mouth later by the dentist according to the model).

In both approaches above, the imprint can be performed using an alginate imprint, whose cost is insignificant. At this stage already, the realization of the prosthesis according to the invention allows a net saving compared to the prior art which requires impressions silicone, or polyether, or hydro-colloids, etc., the price is much higher, both in terms of material supplies and the time of taking.

In the two approaches mentioned above the rest of the operations then take place in the laboratory, where the technician creates the artificial teeth on and / or around the median section 7, which he will have built according to the specific requirements of the case. by means of dental wire or any other suitable structure.

The technician also assembles the first sections (bars 3 and 4) with the second sections (plates 5 and 6), if necessary by inserting an additional element 14. It is observed that the general axis of the bar is roughly a normal to the general plane of the plate. The respect of the right angle is not a condition here, it is simply necessary that the realization does not deviate in a disproportionate way.

However, the present invention also aims to promote the production of industrial series factory ready media consisting of a retention bar and an intermediate plate manufactured in one piece, and supports in one piece and ready to use with a bar, an additional element and an intermediate plate.

Having at his disposal a range of supports associating bars of different dimensions and shapes to plates of various sizes and shapes, the technician will limit himself to choosing the manufactured support which seems to him best suited to each specific case and to cut the bar to the right length considering the characteristics of the occluso-proximal cavity with which it will have to cooperate in each case.

Prefabricated teeth that are commercially available, often used for the manufacture of prostheses, including removable prostheses, are generally resin or a combination of resin with other components, such as composites or porcelain . If the choice is made, especially to reduce the cost as far as possible, on prefabricated teeth, as described above, they will be fixed on the median section by gluing with resin. If the choice is made of teeth manufactured entirely in the laboratory, these will be built directly on / around the median section either by using composites and / or resins, or by producing traditional metal-ceramic teeth. The technique remains the same, but the cost will be higher in

The latter case, without approaching that of prostheses of the prior art involving crowns.

Returning to the logical flow of operations, the technician is faced with a model with cavities useful in the abutment teeth 1 and 2 (whatever the two approaches mentioned above that was adopted). It will position and fix the artificial teeth 15 on the median section so, firstly, that the upper surface of the tooth is where it absolutely must be in all the canons of dentistry and secondly , so that the free portions of the retention bars 3 and 4 occupy a centered position in the cavities, without touching any of the walls of said cavities, and finally at a relative height which allows a sufficient accumulation of material between the top of the cavities. the bar and the upper surface of the natural teeth, so that the sealing is effective and resistant. During this process, both the dentist and the technician have every opportunity to give the retention bars and the median section the exact shape they want.

In this way, once the prosthesis in place, the parts made of the bars can be entirely in the intradental position, and it is exactly the own of the prosthesis according to the invention.

To complete his work, the technician deposits on the metal parts an opaque coating, for example a varnish or a pigmented lacquer, intended to camouflage their presence and prevent them from being seen in transparency.

Again taking the logical course of things, the dentist receives the finished prosthesis that gives him the technician and proceed, if necessary, to any adjustments, then drowns the free parts of the prosthesis then placed in position in a compact mass ionomer glass and / or composites (white filling) and allow the hardening to take place. He controls and adjusts the occlusion according to the usual techniques to complete his work.

The proper positioning of the prosthesis before final sealing is not the easiest exercise, so that an additional arrangement is provided to make this operation easier and therefore faster and safer.

[0051] With reference to FIG. 7, it is observed that the artificial tooth 15 of the prosthesis is provided with a transfer guide (16-17). This transfer guide is intended to make it safer and easier to place the prosthesis in order to seal it. The transfer guide is made by the laboratory technician according to the model of the patient's dentition. The technician may use laboratory resin, or composite, to make the transfer guide. The guide and the prosthesis are secured temporarily, by means of sticky wax, for example, so that the transfer guide can be removed once the seal has been secured.

The transfer guide preferably comprises two wings or lateral extensions 16 and 17, which are adapted to the shape of the natural abutment teeth 1 and 2 so that they will marry exactly said natural teeth ensuring a perfect positioning of the prosthesis relative to the dentition and the cavities. The transfer guide itself, and in particular its wings, are actually partial traditional prints.

The dentist continues his work by verifying that the prosthesis equipped with its transfer guide, and positioned perfectly thanks to him, is as he wishes. Then he removes the prosthesis and introduces into the bottom of the cavities a mass, glass ionomer and / or composites, up to a height that will allow the retention bars, when pressed in exact position thanks to the transfer guide, to sink modo up to half height of their section. After hardening of this first mass, the transfer guide is disengaged and removed from the teeth. The dentist then finishes filling the cavities in one or more layers and finally finishes his work by optimizing the occlusion.

We have just described in detail a prosthesis for replacing a missing tooth interposed between two pillars. In the case where it is necessary to replace two adjacent teeth intercalated, only the length of the median section will be increased, all that has been described remaining perfectly valid.

However, the technical teaching provided by the invention, that is to say the combination of a retention bar and an intermediate plate serving as a support for a (median) section whose task is to wear one or more artificial teeth, can also find application when it comes to making a prosthesis with artificial tooth extension, or with a pillar on one side only. In fact, instead of having five sections, the prosthesis in extension will comprise only three, a retention bar, an intermediate plate and a cantilever section (which was the median section until then).

FIG. 8 is readily understood in light of the foregoing description. It can thus be seen that the prosthesis comprises, as before, a retention bar 4 to which is fixed by welding an intermediate prosthetic plate 6. What obviously changes is the appearance of the section intended to carry the artificial tooth, which here consists of a mesh of loops 18 welded to the intermediate plate, and where appropriate between them, and arranged so as to offer the best possible anchorage to the artificial tooth 15.

We choose loops or protuberances of any other form is of little importance, because it is equivalent means whose purpose is certainly to anchor the artificial tooth to the maximum of the configuration of the case. species allows.

The placement and sealing of the retention bar in at least one abutment tooth (there is shown the setting in play of two abutment teeth 1 and 1) comply with the same indications as those given above in connection with the intercalated variant.

It is the same also for other adaptations described, including the thickened welding, the use of a strut and the implementation of an additional element between the retention bar and the intermediate plate, which allows a collaboration with a cavity with boxing.

As discussed above at the presentation of its purpose, the invention aims to obtain three kinds of benefits, which is detailed below by commenting.

The substantial reduction in the cost of production is certainly the economic purpose of the invention, but it follows from the ease and security of realization better thanks to a lesser degree of sophistication or technicality.

Whether it is taking an alginate impression, milling occluso-proximal cavities, making the prosthesis itself by the laboratory technician, then setting it up, especially guided by the recommended transfer guide, there is, in the following tasks of the dentist and technician, no operation that does not fall within the basic capabilities of the profession of each. In particular, the technician does not work at all on the micrometric scale that is usually his daily life, but on the contrary with a level of tolerance incomparably easier to meet, resulting in a speed of execution multiplied.

In order to give a speaking illustration of the economic gain provided by the prosthesis according to the invention, we will compare below a traditional embodiment with its pendant according to the invention. It is therefore the realization of a traditional prosthesis for an interposed tooth involving two crowns on the pillars, with gold-based casting frame. On the other side, it is opposed to a prosthesis according to the invention, equivalent performance, with artificial tooth prefabricated.

In the traditional variant, the total working time of the dentist, with the patient in the chair, can be estimated on average at 4 hours. In this variant, the technician's bill consists of his working time, ie 10 hours on average, and the cost of the supplies, which is also expressed in technician hours, approximately 2.5 hours. The cost of the traditional variant is thus the addition of 4 hours of dentist and 13 hours of technician.

With the prosthesis according to the invention, the working time of the dentist is 1 hour and a half (30 minutes during the impression taking and the realization of the cavities, and 60 minutes during the final pose). The technician's time, including supplies, is 3 hours.

With the prosthesis according to the invention, the cost related to the work of the dentist is divided by a factor equal to or greater than 2, while the cost of the work of the technician is divided by a factor equal to or greater than 4. In these conditions, the substantial reduction of the cost of realization is really not a usurped qualifier.

Finally, it has also been announced improved reversibility, which can be illustrated again by comparing traditional variants and according to the invention, such as both described a few lines above. It is assumed that, following an accident for example, the artificial tooth must be removed and replaced. According to the traditional variant, it will be possible to saw the armature of the prosthesis in order to separate the armature crowns covering the pillars. Since it is obviously impossible to solder anything in the patient's mouth, the two crowns will not be reusable and they will have to be destroyed (sawn) to be removed. The whole of all the treatment will have to be restarted.

With the prosthesis according to the invention, it is sufficient for the dentist to remove with its mill the mass of glass ionomer and / or composite to dislodge the bar of

Retention, or more drastically to mill also the retention bar. In either case, the prosthesis is removed within minutes. The dentist must in no case attack the body of the natural teeth and will simply clean the two cavities which will then be ready to accommodate a new prosthesis according to the invention. The improvement in reversibility is thus expressed in two ways, in the first place by the elementary simplicity of the operation of removing the prosthesis and secondly by the fact that, as already mentioned, the cost of replacement of the prosthesis will be less to the same extent at least than was the one of his first achievement. Reversibility improvement is thus both technical and economic.

For patients who have in any case the financial means necessary to consider a fixed prosthesis, the benefit of the prosthesis according to the invention will be expressed by a significant saving.

In addition, a significant portion of patients who could not consider, for lack of financial means, a fixed prosthesis, will have access to what has hitherto been prohibited. What is true for patients is also mutatis mutandis for their insurer.

On the other hand, it is very likely that the solution of the prosthesis may be freely preferred over other options, especially when it comes to rebuild a missing tooth inserted by the installation of a implant and a crown, or when a very dilapidated tooth requires a root treatment then a false stump and a crown to be saved, to name just two examples.

Claims (12)

1. Fixed dental prosthesis comprising an artificial tooth and means for securing it with at least two natural abutment teeth of the mouth, characterized in that said means consist of five distinct sections, namely two retention bars intended to be anchored in the abutment teeth and each constituting a section, two intermediate prosthetic plates, each constituting a section, each fixed at the end of one of the retention bars and finally a median section for receiving and carrying the tooth (or) ( s), said median section being fixed on the one side and the other on both intermediate prosthetic plates, the various sections together forming a periodontal splint and being arranged with respect to other such that the relative position of the artificial tooth (s) in relation to the splint on which it is (are) fixed ee (s) is chosen so that each of the two retention bars can occupy, in the abutment tooth associated with it, an intra-dental position; when the two retention bars of the prosthesis are subsequently placed in housings forming two occluso-proximal cavities, housing also provided for this purpose in each of the natural abutment teeth. 2. Prosthesis according to claim 1, characterized in that at least one additional metal element is interposed between a retaining bar and its intermediate plate and is welded with the bar and with the plate, so that the additional element can collaborate with a box whose cavity of the abutment tooth concerned is then equipped. 3. Prosthesis according to claim 1, characterized in that the prosthesis is provided with a transfer guide fixed in temporary solidarity on at least one artificial tooth, said transfer guide being shaped according to an impression of at least one tooth pillar so that, once applied in support on said pillar via the transfer guide, the prosthesis is in the exact position in which it must be secured permanently. 4. Prosthesis according to claim 1, characterized in that at least one retention bar, assumed initially rectilinear, can be bent, curved or warped at will and without damaging consequences for the realization of the prosthesis. 5. Fixed dental prosthesis comprising at least one artificial tooth lying in extension, or in cantilever, and means for securing it with at least one natural abutment tooth of the mouth, characterized in that said means are constituted of three distinct sections, namely a first section consisting of a retention bar intended to be anchored in one or more abutment teeth, a second section consisting of an intermediate prosthetic plate fixed at the end of the retention bar and a third section cantilever fixed to the intermediate plate and being intended to receive and carry the artificial tooth (s) (s), the three sections together forming a periodontal splint and being arranged with respect to each other. in such a way that the relative position of the artificial tooth (s) in relation to the splint on which it is (are) fixed is chosen so that the retention bar can occupy, in the (or) tooth (s) pillar (s) associated with it, an intradentary position; when the retention bar of the prosthesis is subsequently placed in a housing forming an occluso-proximal cavity, housing also provided for this purpose in the (the) tooth (s) pillar (s) natural (s). 6. Prosthesis according to claim 5, characterized in that at least one additional metal element is interposed between the retention bar and its intermediate plate and is welded with the bar and with the plate, so that the additional element can collaborate with a box whose cavity of the abutment tooth concerned is then equipped. 7. Prosthesis according to claim 5, characterized in that the prosthesis is provided with a transfer guide fixed in temporary solidarity on at least one artificial tooth, said transfer guide being shaped according to an impression of at least one tooth pillar so that, once applied in support on said pillar via the transfer guide, the prosthesis is in the exact position in which it must be secured permanently. 8. Prosthesis according to claim 5, characterized in that the retention bar, assumed initially rectilinear, can be bent, curved or warped at will and without damaging consequences for the realization of the prosthesis. 9. Support for fixed dental prosthesis, characterized in that it consists of a retention bar and an intermediate prosthetic plate, the general axis of the bar being roughly normal to the general plane of the plate, said bar and said plate being manufactured in one piece, making the support ready for use. 10. Support for fixed dental prosthesis according to claim 9, characterized in that an additional element of substantially rectangular section is interposed during manufacture between the retention bar and the intermediate prosthetic plate, said bar, additional element and plate being manufactured in one piece, making the media ready for use. 11. Support according to one of claims 9 or 10, characterized in that the face of the intermediate prosthetic plate opposite to that integral with the bar is provided with members, such as sockets, facilitating the subsequent attachment of the bearing frame at least one artificial tooth. 12. Support according to one of claims 9 or 10, characterized in that the face of the intermediate prosthetic plate opposite to that integral with the bar is provided with anchoring members, such as loops, facilitating fixing by gluing, respectively the subsequent construction of at least one artificial tooth.