Dentistry – Apparatus – Broach
Reexamination Certificate
2000-02-04
2001-05-22
Wilson, John J. (Department: 3732)
Dentistry
Apparatus
Broach
C433S224000
Reexamination Certificate
active
06234796
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention concerns a dental root canal instrument with a head part and an instrument part connected thereto.
DESCRIPTION OF RELATED ART
Dental root canal instruments of the type to which the invention is directed are known and are used in particular for treating dental root canals. To do so, the instrument part is preferably designed as a cutting instrument with which a dental root canal can be reamed out.
Dental root canal instruments of the type described above are exposed to great wear, so they usually have only a short lifetime.
SUMMARY OF THE INVENTION
Therefore, a primary object of the present invention is to create a dental root canal instrument with a longer lifetime.
This object is achieved according to this invention by coating the instrument part with a wear-resistant material over at least part of its length.
Especially preferred embodiments of and improvements upon the dental root canal instrument according to this invention include the thickness of the coating being in the range of 0.1 to 5 &mgr;m, and the wear-resistant material having a certain color which is characteristic of the respective instrument, being physiologically safe, stable at temperatures up to 200° C. without the flexibility and elasticity of the instrument part being impaired.
An especially preferred embodiment of this invention is described in greater detail below with reference to the accompanying drawings.
REFERENCES:
patent: 5775902 (1998-07-01), Matsutani et al.
patent: 5868570 (1999-02-01), Hickok et al.
patent: 4241921 (1995-04-01), None
patent: 388675 (1990-03-01), None
patent: 9622060 (1996-07-01), None
patent: 9825536 (1998-06-01), None
Nixon & Peabody LLP
Safran David S.
VDW GmbH
Wilson John J.
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