Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1989-02-09
1991-07-30
Swiatek, Robert P.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
433224, A61C 508
Patent
active
050356208
ABSTRACT:
An endodontic post has an elongated cylindrical outer surface. One and only one groove having a pitch angle in a range of from about 35.degree. to about 55.degree. is disposed in the cylindrical outer surface. The groove performs three functions. It vents air and/or cement as the post is placed in a prepared post space. It aids in retaining the post in place within the post space after the cement is set. It also acts as a thread so that the post can be unthreaded and removed from the post space if necessary. The dimensions of the groove are such that an ungrooved area of the outer cylindrical surface is substantially greater than a grooved area thereof.
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CDA Journal, "Preparing Severely Damaged Teeth", by Shillingburg, Jr., et al., Mar., 1983, pp. 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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