Abutment tooth model and method of manufacturing a prosthetic restoration to be formed on the abutment tooth model

Abstract

An abutment tooth model which can improve a mold releasable property of the prosthetic restoration (releasability from an abutment tooth model or a mold) and a method of manufacturing such a prosthetic restoration are provided The abutment tooth model is formed of a base material such as an ultra-hard plaster (CaSO,.2H,O), and at least one oxide selected from the group comprising Zr, Y and Ca. The abutment tooth model is formed so as to be slightly larger than the abutment tooth to the extent of the degree of shrinkage of the prosthetic restoration (green body) by taking the curing expansion upon molding and the thermal expansion upon sintering into account The abutment tooth is formed using a compound in which Ti powder or Tn alloy powder is contained as its main component, and the compound is built up onto the abutment tooth model,so as to have a desired shape, and thus obtained green body is subjected to a debinding treatment. Then, the green body is sintered together with the green body to obtain a prosthetic restoration composed of the metal sintered body