Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1991-08-30
1993-06-08
Wilson, John J.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
433226, 4332281, A61C 508
Patent
active
052173755
ABSTRACT:
The present invention relates to artificial onlay tooth crowns or inlays composed of a prefabricated core designed for preparations for onlay tooth crowns or inlays in natural teeth. The core is preferably fabricated from a high strength densely sintered ceramic material by copy milling from a negative reproduction from the prepared cavity to a compacted body or a presintered ceramic material. During the copy milling, the sintering shrinkage is considered by enlargement of the copy milled compacted body or the presintered body corresponding to the sintering shrinkage. The onlay tooth crowns and inlays are given the final shape by shaping the surfaces outside the cavity of the compacted or the presintered body. After the final sintering, the external surface can be shaped and a veneer material attached to the external surface of the core by, e.g., firing of dental porcelain. The manufacture of onlay tooth crowns or an inlay according to the method of the invention decreases essentially the manufacturing time for onlay tooth crowns and inlays and at the same time the strength and the accuracy to shape increase.
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Andersson Knut M. G.
Oden Agneta E.
Nobelpharma AB
Sandvik AB
Wilson John J.
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