Arrangement for obtaining reliable anchoring of a threaded implant in a bone

摘要

In an arrangement for obtaining reliable anchoring of a threaded implant in dentine, a hole is made in the bone substance. In the side wall of the hole it is possible to establish an internal threading which can cooperate with an external threading 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.

主权项

1. A threaded implant for obtaining reliable anchoring in a bone substance of a human, the implant comprising:
an external threading on the implant that can cooperate with a side wall of a hole in the bone substance for reliable anchoring and healing-in of the implant; the external threading having a slight conicity; the external threading extending along most of a length of the implant 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 in the bone; the external threading including two or more thread spirals for providing a tight threading on the implant; and, the implant having a tip part merging into a remaining part, wherein the implant threading has a stronger conicity at the tip part than at the remaining part, wherein the external threading along at least part of the longitudinal direction of the implant is given a non-circular or eccentric configuration for obtaining improved stability of the implant in a recently inserted state or an incorporated state of the implant in soft or weak bone substance.