Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1991-05-16
1992-09-08
Swiatek, Robert P.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
433224, A61C 508
Patent
active
051453738
ABSTRACT:
An endodontic post has at least two graduated stages of decreasing diameter with generally cylindrical outer surfaces. The graduations allow the post to diminish in size as it passes into a prepared post space which can be complementarily graduated. The staged post may also include a single groove having a pitch angle in a range of from about 35.degree. to about 55.degree. disposed in the cylindrical outer surfaces thereof.
A graduated endodontic drill has at least two cutting stages of decreasing diameter for cutting through tooth material to make a prepared post space.
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CDA Journal, "Preparing Severely Damaged Teeth", by Shillingburg, Jr., et al., Mar., 1983, 85-91.
Exhibit A--photograph of Model C-1 post made by the Parkall Company.
Exhibit B--photograph of a post manufactured by Dentatus.
Exhibit C--photograph of BCH post.
Exhibit D--photograph of a post made by Parapost.
Exhibit E--photograph of another post manufactured by Parapost.
Exhibit F--photograph of several posts manufactured by Kurer.
Exhibit G--photograph of a post constructed generally like that shown in U.S. Pat. No. 4,479,783 to Weissman at FIGS. 2 and 3.
Exhibit H--photograph of a post having an external spiral thread along with a vertical vent groove.
Lucchesi Nicholas D.
Swiatek Robert P.
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