Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1995-04-17
1997-03-25
Lucchesi, Nicholas D.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
433218, A61C 510, A61C 508
Patent
active
056138547
ABSTRACT:
The method of this invention includes the steps of substituting wax with a new selected medium of a plastic shrinkable material to manufacture a metal substructure known as a dental coping or pontic, for the fabrication of a single or multiple tooth restoration. The new medium is placed over a die, which is the exact replica of what is left of the tooth in a patients mouth that has been clinically prepared for restoration. The die is then covered with the plastic shrink sleeving, and by using an external heat source is shrunk contiguous to the die, leaving a wall thickness of two tenths to three tenths of a millimeter. After trimming away the excess plastic the intermediate plastic is then invested creating a mold which is heated in a high heat oven until the intermediate plastic coping disintegrates completely leaving no unwanted residue on the inner surfaces of the mold. The mold is then cast with a dental alloy to form the metal coping or pontic, upon which the substructures are coated with an acrylic covering or fired on porcelain ceramic compositions to complete the dental restorations.
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