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US 4,307,044 AGranted
Method of making a casting
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.
Claims3
The method of casting of a pontic, comprising the steps of:
- (a) making a pattern composite of wax and a pontic core from ceramic material;
- (b) investing the pattern and removing the wax, leaving the pontic core and investment material to form a mold;
- (c) casting a pontic in the mold to embed the core in a relatively thin metal mass;
- (d) removing the investment material and casting from the mold;
- and
- (e) covering at least a substantial portion of the metal with an outer layer formed of porcelain fused to the metal mass to provide a pontic of lightweight construction having high strength characteristics with minimum distortion, porosity and heat conduction.
3 more elements
Dependencies are inferred from the claim text.