歯科用低溶陶材のグレイジング現象による強度特性

概要

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In order to examine the relationship between particle size and the strength of dental porcelains, the particle distributions of dental porcelains were measured using a laser diffraction particle distribution analyzer. Statistical analysis revealed that the particle distribution was well fitted to a three-parameter Weibull distribution. The bending strength of the glazed specimen was equal to or greater than that of the as-received specimen. This is thought to have resulted from the glass constituent of the porcelain undergoing fusion and flowing into the indentation cracks, thereby contributing to a recovery of bending strength. Using the author's process zone size fracture criterion, experimental data concerning the dependence of the bending strength of glazed specimens on cracking was clarified. The distribution of fracture toughness of glazed specimens agreed well with a two-parameter Weibull distribution. Analysis of the dependence of the bending strength of the glazed specimen on cross head speed indicated that the static fatigue sensitivity of the healed crack was not high.
2005-01-25