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KMID : 0362419940320010047
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Journal of Korean Academy of Prosthodontics
1994 Volume.32 No. 1 p.47 ~ p.76
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An evaluation of the crack propagation characteristics of porcelain and the bond stress of ceramo-metal system
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Park Ju-Mi
Bae Tae-Sung
Song Kwang-Yeob
Park Charn-Woon
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Abstract
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This study was carried out to evaluate the effect of the crack propagation characteristics and bond stress of ceramo-metal system. In order to characterize the crack propagation, the static crack propagation stored in 37℃distilled water of two
commerical porcelains and the dynamic crack propagation under cyclic flexure load of ceramo-metal system were examined. In order to characterize the bond stress, the shear bond test, the 3-point flexure bond test, and the finite element stress analysis of ceramo-metal system were conducted. @ES The results obtained were as follows: @EN 1. Bulk densities and Young’s moduli of opaque porcelains increased with repeated firing. 2. Maximum fracture toughness during 4 firing cycles showed at the group of 4 firing cycles in Ceramco porcelain and 2 firing cycles in Vita porcelain. 3. Shear bond strength and flexure bond strength of Ceramco-Verabond specimen were larger than those of Ceramco-Degudent G specimen(p<0.05) 4. Interfacial stresses under three point flexure bond test were concentrated at the edges of ceramometal system. 5. When a cyclic flexure load was applied, the crack growth rate of porcelain surface of ceramometal specimens was decreased as load cycles increased.
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KEYWORD
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