Self-ligating orthodontic brackets including a ligation...

Details Self-ligating orthodontic brackets including a ligation... Self-ligating orthodontic brackets including a ligation...

A - Human Necessities

61

C

A61C 7/28 (2006.01) A61C 7/30 (2006.01) A61C 7/12 (2006.01)

Patent

CA 2437964

Self ligating orthodontic brackets include a bracket base, a ligation cover which interacts with the bracket base in order to provide ligation of at least one arch wire associated with the bracket base, and spring action that biases the ligation to remain in an open or closed position relative to the base. Such spring action may be provided by an orthodontic barcket (200) that includes a bracket base (202), a flexible ligation cover (204) hingedly attached to the base (202) by a pin hinge (206), and a spring member (208) integrally connected to the cover (204) by an integral film hinge (210) at one end and hingedly attached to the base (202) by a conventional pin hinge (212) at an opposite end. The spring member (208) is curved and attached to the cover (204) and base (204) in a manner so that it reaches maximum elongation somewhere between the closed and open position of the cover (204). Thus, the spring member (208) contracts as the cover (204) approaches both the open and closed positions, thereby selectively biasing the cover toward whichever of these two positions results in further contraction of the spring member (208).

Les verrous orthodontiques de l'invention comprennent une base et un élément de recouvrement qui coopère avec ladite base, de sorte que la ligature d'au moins un arc dentaire associé à la base de verrou soit assurée, et qu'un effet de ressort permette le maintien de l'élément de recouvrement de ligature en position ouverte ou fermée par rapport à la base. Ledit effet de ressort peut être assuré par un verrou orthodontique (200) comportant une base (202), un élément de recouvrement de ligature (204) monté articulé sur la base (202) au moyen d'une tige charnière (206) et un ressort (208) relié à l'élément de recouvrement (204) par une charnière en feuille intégrée (210) à une extrémité, de sorte qu'il fasse partie intégrante de l'élément de recouvrement (204), et fixé pivotant à la base (202) par une charnière à tige classique ()212) à une extrémité opposée. Le ressort (208) est courbe et est fixé à l'élément de recouvrement (204) et à la base (204), de manière qu'il atteigne un allongement maximum quelque part entre la position ouverte et la position fermée de l'élément de recouvrement (204). Le ressort (208) se contracte à mesure que l'élément de recouvrement (204) se rapproche des positions ouverte et fermée, la sollicitation sélective de l'élément de recouvrement, quelle que soit la position visée, induisant la contraction supplémentaire du ressort (208).

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