| 摘要 |
A Precision-machined abutment base for accurately fixing an artificial tooth to a dental implant fixture is fashioned of a dental gold alloy or other machinable rigid dental material in a tubular form having an internal retainer for fixing it to the implant fixture, and external retainers for anchoring it to a rigid substructure of the tooth and to an anatomical overlay covering the substructure. An artificial tooth is disclosed in which the substructure is a casting of the same material as the abutment base, forming a unit with the base, is covered with an overlay of porcelain that is bonded at its gingival end directly to a marginal portion of the abutment base, completely concealing the substructure.
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