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KMID : 0362419930310040482
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Journal of Korean Academy of Prosthodontics
1993 Volume.31 No. 4 p.482 ~ p.505
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An experimental study on the fatigue fracture of laminate porcelain
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Park Charn-Woon
Bae Tae-Sung
Lee Sang-Don
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Abstract
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The purpose of this study was to evaluate the fracture characteristics and the resin bonding of laminate porcelain. In order to characterize the indentation-induced crack. Young’s moduli and characteristic indentation dimensions were measured. The fatigue life under three point flexure test was measured using the electro-dynamic type fatigue machine, and the
crack propagation with thermocycling was investigated on the condition of 15 second dwell time each in 5℃and 55℃bath. The Vickers indentation pattern and the fracture surface were examined by an optical microscope and a scanning electron microscope(SEM). @ES The results obtained were summarized as follows: @EN 1. Young’s moduli(E) of the laminate porcelain and the resin cement used in this experiment were 62.56±3.79GPa and 15.01 0.12GPa, respectively. 2. The initial crack size of the laminate porcelain was 69.19±5.94μm when an indentation load of 9.8N was applied, and the fracture toughness was 1.056±0.156Mpa.m . 3. The fatigue life of laminate porcelain showed the constant range at the stress level 27.46-35.30MPa. 4. When a cyclic flexure load was applied, the fatigue life of resin-bonded laminate porcelain was more decreased than that of laminate porcelain. 5. When a thermocycling was conducted, the crack growth rate of resin-bonded laminate porcelain was more increased than that of laminate porcelain. 6. Fracture surface showed the radial crack, the lateral crack, and the macroscopic crack branching region beneath the plastic deformation region when an indentation load of 9.8N was applied.
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