Arrangement for obtaining reliable anchoring of a threaded...

A - Human Necessities – 61 – C

Patent

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A61C 8/00 (2006.01)

Patent

CA 2307304

In an arrangement for obtaining reliable anchoring of a threaded implant (3) in dentine, a hole (2) is made in the bone substance. In the side wall (2b) of the hole it is possible to establish an internal threading which can cooperate with an external threading (3d) on the implant. The implant threading is arranged to force the bone substance out in essentially radial directions as a function of the extent to which the implant is screwed into the hole. The threading is arranged to effect greater forcing out of the bone substance at the outer parts of the hole than at the inner parts of the hole. The degree of forcing out is adapted in relation to the softness of the bone in order to achieve the reliable anchoring. Along at least part of the longitudinal direction of the implant, the implant threading can be given a non-circular configuration for the purpose of obtaining improved rotational stability in soft/weak bone. The implant can also have two or more thread spirals/thread entries which shorten the time for screwing the implant into the hole and additionally offer tight threading which permits effective integration with the bone substance during the healing-in process.

Dans un procédé d'obtention d'un ancrage sûr d'un implant fileté (3) dans la dentine, on pratique un trou (2) dans la substance osseuse. Dans la paroi latérale (2b) de ce trou, on peut établir un filetage interne, lequel peut coopérer avec un filetage externe (3d) ménagé sur l'implant. Le filetage de l'implant est conçu de manière à faire sortir la substance osseuse vers l'extérieur, dans des directions essentiellement radiales, en fonction de l'importance du vissage de l'implant dans le trou. Le filetage est conçu pour faire sortir la substance osseuse de manière plus importante au niveau des parties extérieures du trou qu'au niveau des parties intérieures de celui-ci. Le degré d'élimination de la substance osseuse est conçu en fonction de la tendreté de l'os, de manière à obtenir un ancrage sûr. Sur au moins une partie du sens longitudinal de l'implant, on peut donner au filetage une forme non circulaire, dans le but d'obtenir une meilleure stabilité rotationnelle dans un os mou/fragile. L'implant peut également présenter deux spirales de filetage/entrées de filetage, ou davantage, à l'effet de raccourcir le temps de vissage de l'implant dans le trou et d'obtenir en outre un filetage serré, lequel permet une intégration efficace de l'implant dans la substance osseuse, lors du processus de consolidation interne.

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