Abstract
Newly-developed all ceramic and metal ceramic crowns are alternatives to conventional porcelain jacket crowns (PJC) and porcelain fused to metal crowns (PFM).Two types of metal ceramic crowns, made by sintering precious metals, were investigated as to adaptation and strength in clinical applications.The results were as follows:1. The prime factors in adaptation of crowns are the method of impression used for making a duplication die with the HERATEC (HT) system, and the method of applying the bonding agent between duplication die materials and the metal of the DEGUSINT (DG) system.2. The strengths of these new metal ceramic crowns depend on the thickness of the sintered metal layer.3. The strength of the HT crown is equal to the value of PJC and is one-third that of PFM, while the strength of the DG crown is two times that of the HT crown and the PJC and 0.7 times that of PFM.4. To increase the strength of these new crowns, with the HT system, the thickness of the sintered metal layer and the mechanical strength of Au-Pd layer must be increased, and the number and the diameter of bubbles in the metal ceramic conjunction layer, should be decreased. With the DG system, it is necessary to increase the mechanical strength of the sintered metals. Thus it is necessary to investigate the sintering conditions.
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