Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1993-06-15
1994-09-13
Wilson, John J.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
4332021, 4332121, 433218, 264 19, A61C 510
Patent
active
053463978
ABSTRACT:
A process for making artificial porcelain teeth or laboratory fabricated dental crowns includes casting or molding a plurality of tooth-shaped unfired shells from ceramic powder and a resin, acrylic, wax or starch in liquid form and molded and hardened into shapes of predetermined tooth contours. These dried powder like, thin and highly characterized outside shells of a general tooth shape are then merged into a full porcelain powder buildup of the tooth shape by using conventional porcelain powders mixed into a paste, conventionally, as a filling medium completing the buildup of tooth or crown form. This form is then placed into a furnace and heated to purge undesired resin, acrylic, wax or starch and other extraneous material, and then it is baked conventionally to further purge same and obtain an artificial tooth or crown in the most desirable form possible for the technician who then finalizes the contour by grinding and polishing or glazing same conventionally. The powder like dried shell may be used with a substructure or glass core or refractory die. The process preferably includes the provision of determining the proper color of porcelain powders to use to arrive at the final color of the tooth or crown even before firing and baking the shell and filling medium.
REFERENCES:
patent: 4556389 (1985-12-01), Ueno et al.
patent: 4810193 (1989-03-01), Wieder
patent: 5192207 (1993-03-01), Rosellini
Wilson John J.
Yeager Arthur G.
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