Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
2005-05-24
2005-05-24
O'Connor, Cary E. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S173000
Reexamination Certificate
active
06896517
ABSTRACT:
A self-tapping implant for jawbone comprises a body (15) with threads arranged thereon, a conically tapering portion (12) arranged at its front end, and one or more spaces (4, 5, 6) which accommodate bone material cut off during tapping and which are formed by removal of material from the threads and body in question. Each materially reduced thread has a cutting edge (1a, 2a, 3a) which extends inwards from the outer edge of the respective remaining thread part and which can cooperate with the bone during tapping. Each cutting edge of a number of cutting edges has a pointed shape (1b, 2b, 3b) which, in the cross section of the thread in question, essentially follows a line which deviates from a radius (r) through the remaining thread part's front portion or the pointed shape's point (1b, 2b, 3b) in order in this way to form a cutting angle. Each cutting edge (1a, 2a, 3a) on a first remaining thread part (1, 2, 3) merges via a radius (r′) or curved part into a rear edge (e.g.2d) on a second remaining thread part, which is arranged before the first thread part in the direction of screwing (7), for the purpose of providing optimum remaining material in the body and remaining thread parts and, consequently, optimum strength of the implant part in question.
REFERENCES:
patent: 5727943 (1998-03-01), Beaty et al.
patent: 5897319 (1999-04-01), Wagner et al.
patent: 0641549 (1995-03-01), None
patent: WO 9703621 (1997-02-01), None
patent: WO 9743976 (1997-11-01), None
Björn Göran
Engman Fredrik
Jörnéus Lars
Connolly Bove & Lodge & Hutz LLP
Hume Larry J.
Nobel Biocare AB
Stokes Candice C.
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