FR2689752A1

FR2689752A1 - Magnetic attachment for dental prosthesis - having magnet held in a cage which allows slight movement

Info

Publication number: FR2689752A1
Application number: FR9304467A
Authority: FR
Inventors: Segura Claude; Bes Claude
Original assignee: BES SARL CABINET CLAUDE
Current assignee: BES SARL CABINET CLAUDE
Priority date: 1992-04-10
Filing date: 1993-04-09
Publication date: 1993-10-15
Anticipated expiration: 2013-04-09
Also published as: FR2689752B1

Abstract

A magnetic attachment can be used in a dental prosthesis, where a permanent magnet is embedded in the added dental device. A cap (3) covers the support root (5), including a post (4), made by metal casting. The cap has a flat disc (1) embedded in it made of ferromagnetic material. This is integrated in the wax of the cap model, when the cap itself is made by the lost wax technique. The magnet is partly or entirely covered by a flexible material such as rubber, creating an elastic link, and slight mobility between the two parts of the prosthesis, and also avoids direct contact and possible ionic transport between the elements. Pref. the magnetic disc (1) has a peripheral groove which ensures its position is maintained within the cap. The magnet can be positioned using a thin disc with a hole in its centre which fits the magnet. The thin disc is used to hold the magnet in place during preparation of the added prosthesis, as it can be deformed around the cap. The magnet is held in a conical cage (13) of synthetic material in which it can move slightly axially and laterally with pressure from chewing, with respect to a frame (14) directly fixed to the prosthesis. Stops on the cage and frame prevent too much movement. A block of flexible material (7) may be used above the magnet, inside the base of the frame (14).

Description

ATTACHEMENT MAGNETIQUE INTRACORONAIRE
POUR PROTHESE DENTAIRE
L'invention est relative à un attachement magnétique intracoronaire pour prothèse dentaire amovible du genre comportant a) un aimant destiné à être intégré dans l'appareil dentaire adjoint; b) une chape, recouvrant la racine support, solidaire d'un pivot associé à ladite racine, obtenue par coulée métallique simultanée avec celle du pivot qui est initialement en matériau calcinable.INTRACORONARY MAGNETIC ATTACHMENT
FOR DENTAL PROSTHESIS
The invention relates to an intracoronary magnetic attachment for a removable dental prosthesis of the type comprising a) a magnet intended to be integrated in the assistant dental appliance; b) a yoke, covering the support root, secured to a pivot associated with said root, obtained by metal casting simultaneous with that of the pivot which is initially made of burn-out material.

Dans les dispositifs connus du genre en question a) la chape est réalisée entièrement en matériau ferromagnétique contrairement aux techniques classiques de réalisation de chapes métalliques pour prothèses dentaires qui utilisent des matériaux standards faciles à approvisionner et de mise en oeuvre connue; b) l'aimant est directement au contact de la chape ce qui présente un triple inconvénient : - celui lié au transport ionique, - celui lié au fait que les efforts masticatoires sont transmis directement à la racine support; - celui lié à la non mobilité de aimant par rapport à la chape dans le sens de l'axe de la racine pour tenir compte des efforts masticatoires et en rotation latérale pour tenir compte de la rénitence de la muqueuse. In known devices of the kind in question a) the screed is made entirely of ferromagnetic material unlike the conventional techniques for producing metallic screeds for dental prostheses which use standard materials which are easy to supply and of known implementation; b) the magnet is directly in contact with the yoke, which has a triple disadvantage: - that linked to ionic transport, - that linked to the fact that the masticatory forces are transmitted directly to the support root; - that related to the non-mobility of the magnet relative to the yoke in the direction of the axis of the root to take account of masticatory forces and in lateral rotation to take into account the renitence of the mucosa.

L'invention vise à réaliser un produit dont la mise en oeuvre utilise les produits classiques et les techniques habituelles tout en supprimant lesdits trois inconvénients ci-avant. The invention aims to produce a product, the implementation of which uses the conventional products and the usual techniques while eliminating said three disadvantages above.

Pour ce faire, 1 invention en question met en oeuvre un attachement qui se caractérise en ce qu'il comporte a) une rondelle pleine, en matériau ferromagnétique, pourvue d'une tige de préhension et de parallélisme, destinée à être intégrée dans la maquette en cire de la chape, donc dans la chape métallique résultante obtenue par la technique de la cire perdue; b) un aimant partiellement ou totalement recouvert d'une enveloppe en matière souple, généralement caoutchouteuse, destinée à assurer la liaison élastique entre la racine support; c) une cage, en matière synthétique, destinée à éviter le contact direct dudit aimant avec ladite rondelle intégrée, évitant ainsi tout transport ionique entre lesdits deux éléments, et à créer, entre ces derniers, une liaison permettant une légère rotation de l'un par rapport à l'autre. To do this, the invention in question uses an attachment which is characterized in that it comprises a) a solid washer, made of ferromagnetic material, provided with a gripping and parallelism rod, intended to be integrated into the model in screed wax, therefore in the resulting metallic screed obtained by the lost wax technique; b) a magnet partially or completely covered with a flexible material envelope, generally rubbery, intended to ensure the elastic connection between the support root; c) a cage, made of synthetic material, intended to avoid direct contact of said magnet with said integrated washer, thus avoiding any ionic transport between said two elements, and to create, between the latter, a connection allowing a slight rotation of one compared to each other.

Les caractéristiques et les avantages de l'invention vont apparaître plus clairement à la lecture de la description détaillée qui suit d'un mode de réalisation préféré de l'invention donné seulement à titre d'exemple et représenté aux dessins annexés. The characteristics and advantages of the invention will appear more clearly on reading the following detailed description of a preferred embodiment of the invention given only by way of example and shown in the accompanying drawings.

Sur ces dessins - la figure 1 est une vue en coupe de la chape intégrant la rondelle ferromagnétique; - la figure 2 est une vue de la rondelle ferromagnétique; - la figure 3 est une vue en coupe de l'aimant; - la figure 4 est une vue en coupe de la rondelle de positionnement.In these drawings - Figure 1 is a sectional view of the yoke incorporating the ferromagnetic washer; - Figure 2 is a view of the ferromagnetic washer; - Figure 3 is a sectional view of the magnet; - Figure 4 is a sectional view of the positioning washer.

- la figure 5 est une vue en coupe de l'aimmant associé à son support.- Figure 5 is a sectional view of the magnet associated with its support.

L'ensemble représenté à la figure 1 comporte une chape (3), recouvrant la racine support (5), solidaire d'un pivot (4) associé à ladite racine, et une rondelle pleine (1), en matériau ferromagnétique, intégrée dans ladite chape. Les différents éléments (3) et (4) étant réalisés par cou lée métallique simultanee. Le pivot (4) est initialement en matériau calcinable et la rondelle est d'abord intégrée dans la maquette en cire de la chape (technique de la cire perdue). The assembly represented in FIG. 1 comprises a yoke (3), covering the support root (5), integral with a pivot (4) associated with said root, and a solid washer (1), made of ferromagnetic material, integrated in said screed. The different elements (3) and (4) being produced by simultaneous metal casting. The pivot (4) is initially made of burnable material and the washer is first integrated into the wax model of the screed (lost wax technique).

L'élément représenté à la figure 2 correspond à la rondelle ferromagnétique (1) qui comporte une tige (2) de préhension et de parallélisme (elle sera découpée après positionnement) et une rainure périphérique~(10) destinée à assurer son maintien permanent dans la chape métallique coulée. The element shown in Figure 2 corresponds to the ferromagnetic washer (1) which comprises a rod (2) for gripping and parallelism (it will be cut after positioning) and a peripheral groove ~ (10) intended to ensure its permanent retention in the metal screed poured.

L'élément représenté à la figure 3 correspond à l'aimant (6) entiérement recouvert d'une enveloppe (7) en matière souple, notamment caoutchou- teuse, destinée à éviter le contact direct dudit aimant avec ladite rohdel- le intégrée, évitant ainsi tout transport ionique entre lesdits deux e' éIé- ments, et à créer, entre ces derniers, une liaison élastique permettant une légère mobilité de l'un-pat rapport à l'autre, par compression. The element shown in FIG. 3 corresponds to the magnet (6) entirely covered with an envelope (7) made of flexible material, in particular rubber material, intended to avoid direct contact of said magnet with said integrated rod, avoiding thus any ionic transport between the said two elements, and to create, between the latter, an elastic connection allowing slight mobility of the one-pat relative to the other, by compression.

L'élément représenté à la figure 4 correspond à une rondelle mince de positionnement (8) pourvue d'un logement central (9) destiné à contenir l'aimant (6) pendant la phase de réalisation de la partie adjointe de la prothèse, ledit logement étant centré par rapport à la rondelle ferromagnétique (I), intégrée dans la chape (3), et ladite rondelle de positionnement (8) étant plaquée, par déformation, sur ladite chape. Ellè peut être réa- lisée en étain de 3/10 ème de mm d'épaisseur. Elle ne sert qu'à positionner l'aimant dans ladite phase de fabrication. The element shown in Figure 4 corresponds to a thin positioning washer (8) provided with a central housing (9) intended to contain the magnet (6) during the production phase of the adjoining part of the prosthesis, said housing being centered relative to the ferromagnetic washer (I), integrated in the yoke (3), and said positioning washer (8) being pressed, by deformation, on said yoke. It can be made of pewter 3/10 th of a mm thick. It only serves to position the magnet in said manufacturing phase.

L'ensemble représenté à la figure 5 comporte l'aimant (6) placé dans une cage (13), en matière synthétique, à paroi extérieure conique, apte à se mouvoir en translation axiale et en rotation latérale, respectivement sous l'effet de la pression masticatoire et de la rénitence de la muqueuse, par rapport à une gaine (14), à paroi intérieure cylindrique, qui est rendue directement solidaire de la prothèse adjointe (11). The assembly shown in FIG. 5 comprises the magnet (6) placed in a cage (13), made of synthetic material, with a conical outer wall, capable of moving in axial translation and in lateral rotation, respectively under the effect of the masticatory pressure and the renitence of the mucosa, relative to a sheath (14), with a cylindrical inner wall, which is made directly integral with the assistant prosthesis (11).

L'enveloppe (7),en matière souple, est placée entre le dessus de l'aimant (6) et le fond de la gaine (14).The envelope (7), made of flexible material, is placed between the top of the magnet (6) and the bottom of the sheath (14).

La cage (13) et la gaine (14) comportent respectivement des butées (15) et (16) qui limitent la course en translation et qui permettent la rotation latérale, par rapport aux extrémités des butées (15), de la cage par rapport à la gaine.The cage (13) and the sheath (14) respectively comprise stops (15) and (16) which limit the travel in translation and which allow the lateral rotation, relative to the ends of the stops (15), of the cage relative to the sheath.

La cage en matière synthétique, généralement en matière plastique flexible, facilite le montage de celle-ci dans la gaine. Elle permet, outre les fonctions de translation et de rotation, la fonction d'éviter le phénomène de bimétallisation entre l'aimant et la chape de la prothèse conjointe (12).The plastic cage, usually flexible plastic, makes it easier to mount it in the sheath. It allows, in addition to the translation and rotation functions, the function of avoiding the phenomenon of bimetallization between the magnet and the coping of the joint prosthesis (12).

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et représentés pour lesquels on pourra prévoir d'autres variantes sans pour cela sortir du cadre de l'invention. Of course, the invention is not limited to the embodiments described and shown for which we can provide other variants without departing from the scope of the invention.

Claims

1- Magnetic intracoronary attachment for removable dental prosthesis, of the type comprising a) a permanent magnet (6) capable of being integrated in the adjoining part (11) of the prosthesis; b) a ferromagnetic element, constituting the joint part (12) of the prosthesis, obtained by simultaneous metal casting of a yoke (3), covering the support root (5), initially sculpted with wax on the master model, and a pivot (4), initially made of burn-out material, capable of ensuring the permanent connection of said cap and said root; characterized in that the ferromagnetic element, which is made completely independent, in its constitution, from the nature of the metal constituting the yoke (3) and the associated pivot (4), consists of a solid ferromagnetic washer (l), provided with '' a rod (2) for gripping and parallelism, intended to be integrated into the wax model of the yoke (3), therefore of the metal yoke resulting from the casting, and in that the magnet (6) is covered , partially or completely, of an envelope (7), of flexible material, generally rubbery, intended to create, with the washer (1), directly or indirectly, an elastic contact type silent-block.

2- Attachment according to claim 1, characterized in that the washer (1) has a peripheral groove (10) intended to ensure its permanent retention in the cast metal yoke (3).

3- Attachment according to claim 1, characterized in that it is associated with a thin positioning washer (8) provided with a central housing (9) intended to contain the magnet (6) during the production phase of the adjoining part (11) of the prosthesis, said housing being centered relative to the ferromagnetic washer (1), integrated in the yoke (3), and said positioning washer (8) being pressed, by deformation, on said yoke.

4- Attachment according to claim 1, characterized in that the magnet (6) is placed in a cage (13), of synthetic material, with conical outer wall, capable of moving in axial translation and in lateral rotation, respectively under the effect of the masticatory pressure and the renitence of the mucosa, with respect to a sheath (14), with cylindrical inner wall, which is made directly integral with the assistant prosthesis (11).

5- Attachment according to claim 4, characterized in that the envelope (7), made of flexible material, is placed between the top of the magnet (6) and the bottom of the sheath (14).

6- attachment according to claim (4), characterized in that the cage (13) and the sheath (14) respectively comprise stops (15) and (16) which limit the travel in translation and which allow lateral rotation, relative to the ends of the stops (15), of the cage relative to the sheath.