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KMID : 0362419920300010125
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Journal of Korean Academy of Prosthodontics
1992 Volume.30 No. 1 p.125 ~ p.134
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THE FRACTURE RESISTANCE OF CERAMOMETAL CROWN WITH VARIOUS COPING DESIGN
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Chung Wan-Mo
Dong Jin-Keun
Jin Tai-Ho
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Abstract
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The purpose of this study was to evaluate the effect of the metal coping design on the fracture resistance of ceramometal crown. The Ni-Cr alloy(Supranium, Krupp Co., German) and Vaccm - fired porcelain powder(Vita VMK 689, Vita Co., Germany) were used in this study. The measurement of fracture resisitance of ceramomtal crown was done with Instron Universial Testing Machine(Instro Co., Model no.4201). @ES he obained results wee as follows : @EN 1. The fracture resistance measured at the buccal cusp tip was the highest value in the group that those position of ceramometal junction was 2mm superior to the lingual finishing margin(100.25Kg) and the fracture resistance revealed on order of the group that those position was 2mm buccal to the central groove(51.64Kg). 2. The frature resistance measured at the central groove was higher value in the group that those position was 2mm lingual to the central groove than in the group that those position was 2mm lingual to the central groove than in the group that those position was 2mm superior to lingual finishing margin(132.48Kg). 3. In all cases, the fracture resistance at the central groove was higher than that at the buccal cusp tip.
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KEYWORD
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