Back to results
US 4,229,170 AGranted
Pontic having an internal ceramic core
OwnerRichard D. Perezinventor
Life of this patent
Estimating the term…
Abstract
A pontic having a core constructed from a ceramic material embedded in a metal mass at least a portion of which is itself covered by a layer of porcelain. One or more pins are initially inserted into the core for facilitating placement of the core subsequent to waxing of same into a pattern in the cavity of a mold while the pattern is invested and the metal mass subsequently cast within the investment. The porcelain covering layer can be added to the casting in a conventional manner once the casting has been removed from the mold and cleaned in an appropriate manner.
Claims1
A pontic, comprising, in combination:
- (a) a core constructed from a ceramic material;
- (b) a relatively thin metal mass disposed around and embedding the core;
- and
- (c) a covering layer formed of porcelain fused to the metal mass and extending over at least a substantial portion of the metal mass to provide a pontic of lightweight construction having high strength characteristics with minimum distortion, porosity and heat conduction.
1 more element
Dependencies are inferred from the claim text.