Abstract
In order to apply UCC to post and cores or bridges, sintered zirconium (3Y 20 A) was selected as the reinforcing material. In order to combine cast OCC to 3 Y 20 A, it is necessary to line them with dental porcelain as a binder. In order to determine a higher bonding strength, this study was conducted to observe diffusing of ion, to discuss strength of 3Y 20 A itself and bonding strength, and to apply heat treatment (Ht) to the 3Y 20 A specimen bonded to dental porcelain. The results were as follows:1. K and Na ion diffused from dental porcelain to 3Y 20 A at 1, 200°C and 1, 400°C respectively.2. The permeation of glass constituents of porcelain into 3Y 20 A, and the formation of the reacted layerwith growth and transformation of crystalline grains were found according to diffused area at 1, 400°C This factor is improper because the strength of the reacted layer is less than that of dental porcelain.3. Annealing after machining 3Y 20 A is necessary because the strength of surface transformation increased by machining and decreased due to mutual transformation at 1, 200°C.4. In this bonding strength 3Y 20 A/OCC test, Duceratin opaque had a maximum value of 1, 200°C.
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