FR2751524A1

FR2751524A1 - Instrument for preparation of dental channel ready for filling

Info

Publication number: FR2751524A1
Application number: FR9609491A
Authority: FR
Inventors: Jean Marie Badoz; Paul Calas; Jean Marie Vulcain; Hubert Euvrard
Original assignee: Micro Mega International Manufactures SA
Current assignee: Micro Mega International Manufactures SA
Priority date: 1996-07-23
Filing date: 1996-07-23
Publication date: 1998-01-30
Anticipated expiration: 2016-07-23
Also published as: FR2751524B1

Abstract

The instrument comprises a conical shaped blade having a handle at its proximal end. The distal end has a bevel shape (1). The bevel may have a concave surface (2) and a planar surface (3). The intersection edge between the bevel surface and the cylinder jacket may be rounded on half of its circumference delimited by the major axis of the oval shape obtained by the intersection. The section of the blade near the distal end may be circular. The body of the blade may have barbs and the cutter may have at least one helicoidal lip which cuts at least a part of its length.

Description

La présente invention a pour objet un instrument canalaire pour la préparation des canaux dentaires préalable à leur obturation. The present invention relates to a canal instrument for the preparation of the dental canals prior to their filling.

On connaît déjà un grand nombre d'instruments utilisant des mouvements de rotation continue ou des mouvements de rotation alternée, en éventuelle combinaison avec un mouvement de va-et-vient. A large number of instruments are already known using continuous rotation movements or alternating rotation movements, possibly in combination with a reciprocating movement.

Avec de tels instruments, les chirurgiens-dentistes sont souvent confrontés à deux problèmes importants qui sont d'une part le risque de création de faux canaux dA à une pointe agressive, et d'autre part, la difficulté de reprise de traitement pour laquelle il est nécessaire d'extirper le (ou les) produit(s) d'obturation qui avai(en)t été placé(s) dans un canal dentaire lors d'une précédente obturation. With such instruments, dental surgeons are often confronted with two important problems which are on the one hand the risk of creation of false dA channels at an aggressive point, and on the other hand, the difficulty of resumption of treatment for which it it is necessary to remove the filling product (s) that had been placed in a dental canal during a previous filling.

Pour le premier problème exposé précédemment, la solution se trouve dans les instruments dont la pointe généralement conique est réalisée de façon désaxée par rapport à l'axe de l'instrument. For the first problem described above, the solution is found in instruments whose generally conical tip is made offset from the axis of the instrument.

Cette solution, bien qu'efficace, n'est pas rentable en termes de production et est inefficace en reprise de traitement. This solution, although effective, is not profitable in terms of production and is ineffective in resumption of treatment.

Le but de l'invention est de fournir un instrument canalaire permettant de remédier aux problèmes précédemment cités. The object of the invention is to provide a canal instrument making it possible to remedy the problems mentioned above.

Conformément à l'invention, ce résultat est obtenu par un instrument canalaire composé d'une lame de forme générale conique équipée à son extrémité proximale d'un manche caractérisé en ce que l'extrémité distale présente une forme de biseau. According to the invention, this result is obtained by a canal instrument composed of a blade of generally conical shape equipped at its proximal end with a handle characterized in that the distal end has a bevel shape.

Selon différents modes de réalisation, le biseau peut présenter soit une face concave, soit une face plane. According to different embodiments, the bevel can have either a concave face or a flat face.

Selon une forme préférée de l'invention, l'arête d'intersection entre la face du biseau et l'enveloppe du cylindre est arrondie sur la moitié de la circonférence délimitée par le grand axe de l'ovale obtenu par l'intersection. According to a preferred form of the invention, the intersection edge between the face of the bevel and the envelope of the cylinder is rounded over half of the circumference delimited by the major axis of the oval obtained by the intersection.

La lame de forme générale conique est pourvue d'au moins une lèvre hélicoïdale coupante sur au moins une partie de sa longueur. The generally conical blade is provided with at least one helical cutting lip over at least part of its length.

En outre, la cannelure consécutive à la réalisation de la lèvre coupante débouche dans une face du biseau. In addition, the groove following the production of the cutting lip opens into one face of the bevel.

Avantageusement, I'instrument canalaire est pourvu de trois lèvres hélicoïdales coupantes. Advantageously, the canal instrument is provided with three cutting helical lips.

On comprendra mieux 1' invention à 1' aide de la description faite ci-après en référence aux dessins annexés dans lesquels:
- la figure 1 est une vue schématique d' une extrémité distale présentant une forme de biseau suivant r invention,
- les figures 2, 3, 4 et 5 représentent des vues en coupe selon AA de différentes formes de biseau suivant 1' invention.The invention will be better understood with the aid of the description given below with reference to the appended drawings in which:
FIG. 1 is a schematic view of a distal end having a bevel shape according to the invention,
- Figures 2, 3, 4 and 5 show sectional views along AA of different forms of bevel 1 according to the invention.

On a illustré à la figure 1, la forme du biseau (1) que prend l'extrémité distale d' une lame d' un instrument canalaire. Illustrated in Figure 1, the shape of the bevel (1) that takes the distal end of a blade of a canal instrument.

Sur les figures 2 et 3, on a illustré un biseau comportant une face concave (2) et un biseau comportant une face plane (3). In Figures 2 and 3, there is illustrated a bevel having a concave face (2) and a bevel having a flat face (3).

On peut voir sur la figure 5 une illustration de l'arête d'intersection entre la face du biseau et l'enveloppe du cylindre lorsque ladite arête d'intersection s'arrondie sur la moitié de la circonférence délimitée par le grand axe de l'intersection. We can see in Figure 5 an illustration of the intersection edge between the face of the bevel and the cylinder shell when said intersection edge is rounded over half the circumference bounded by the major axis of the intersection.

La section de la lame au voisinage de 1' extrémité distale est circulaire. The section of the blade in the vicinity of the distal end is circular.

L'instrument canalaire suivant l'invention comportera également les particularités suivantes non représentées:
- la tangente ou pointe de coupe de la lèvre de coupe tend à se superposer avec la tangente ou cercle dans lequel s'inscrit la section de I' instrument,
- I'arête de coupe présente un arrondi sur au moins une partie de sa longueur,
- 1' instrument canalaire suivant 1' invention est décliné en série d' instruments de diamètre à la pointe constant et de conicité variable,
- la section de la lame au voisinage de 1' extrémité distale est circulaire. The canal instrument according to the invention will also include the following features, not shown:
- the tangent or cutting tip of the cutting lip tends to overlap with the tangent or circle in which the section of the instrument is inscribed,
- the cutting edge is rounded over at least part of its length,
The canal instrument according to the invention is available in series of instruments of constant tip diameter and of variable conicity,
- The section of the blade near the distal end is circular.

Claims

1. Canal instrument composed of a generally conical blade equipped at its proximal end with a handle characterized in that the distal end has a bevel shape (1).

2. root canal according to claim 1, characterized in that the bevel has a concave face (2).

3. root canal according to claim 1, characterized in that the bevel has a flat face (3).

4. root canal instrument according to any one of claims 1 to 3, characterized in that the intersection edge between the face of the bevel and the envelope of the cylinder is rounded over half of the circumference delimited by the major axis of the oval obtained by the intersection.

5. root canal according to any one of claims 1 to 4, characterized in that the section of the blade in the vicinity of the distal end is circular.

6. root canal instrument according to any one of claims 1 to 5, characterized in that the barrel of the blade is provided with barbs.

7. root canal instrument according to one of claims 1 to 4, characterized in that the generally conical blade is provided with at least one helical cutting lip over at least part of its length.

8. Canal instrument according to claim 7, characterized in that the groove consecutive to the production of the helical cutting lip opens into the face of the bevel.

9. root canal according to any one of claims 7 or 8, characterized in that it is provided with three cutting helical lips.

10. Canal instrument according to any one of claims 7 to 9, characterized in that the tangent or cutting tip of the cutting lip tends to be superimposed with the tangent or circle in which the section of the instrument is inscribed .

11. Instrument according to one of claims 7 to 10, characterized in that

I 'cutting edge has a rounded over at least a portion of its length.

12. Instrument according to any one of claims 1 to 11, characterized in that it is declined in series of instruments of constant diameter and variable taper.