Minimization of the marginal deterioration of ceramic inlays with fractographic examination.

通过定量研究和形态学分析，阐明了陶瓷镶嵌体的边缘变化，并确定了这些变化的机理。功能尖头区边缘崩解显著大于非功能尖头区（Wilcoxon符号秩检验，p<0.05）。定量测量和断口检查确定了连续的三阶段边缘恶化模式；树脂复合水泥的磨损在第一阶段开始快速发展，第二阶段没有明显的可见变化，然后陶瓷和/或搪瓷的微断裂在第三阶段快速发展。第一阶段和第二阶段之间的界限出现在6个月和21个月，第二阶段和第三阶段之间的界限出现在72个月。结果表明，陶瓷镶嵌体的纵向边缘劣化以连续的三阶段模式进行。我们建立了陶瓷镶嵌体边缘退化的体外加速试验，并研究了水泥厚度对边缘退化的影响。结果表明，共1600次循环磨损的体外加速试验，在数量和形态上成功再现了体内三次连续的边际退化。在水泥宽度为100 μm的试样中，观察到的边缘劣化明显较少（方差分析和Scheffe's F检验，p<0.05）。建议水泥宽度应小于100 μm，以尽量减少陶瓷镶嵌体的边际劣化。在水平间隙中，探测尖端直径与阿尔法/布拉沃边界之间存在显著相关性，而在垂直台阶中则不存在显著相关性。结果表明，辅助和非辅助镜目视检查对模拟边缘差异的评价没有显著影响。这一发现强调了传统牙科探索者的重要性——在缺乏更具歧视性的设备的情况下，评估修复体的边际差异。少

We investigated quantitatively and morphologically analyzed and clarified the marginal changes of ceramic inlays and determined the mechanism for those changes. Marginal disintegration at the functional cusp area was significantly greater than at the non-functional cusp area (Wilcoxon signed-ranks test, p<0.05). Quantitative measurement and fractographic examination identified a sequential three-stage pattern of marginal deterioration ; initial rapid progress of wear of resin composite cement in the first stage, followed by a second stage without any remarkable visible change, then rapid progression of microfractures of ceramics and/or enamel in the third stage. Boundaries between the first and second stage were found in the six and 21-month period, and those between the second and third stage at 72 months. It was concluded that longitudinal marginal deterioration of ceramic inlays progressed in a sequential three-stage pattern.We established an in vitro acceleration test of the margin … More al deterioration of ceramic inlays reproducing in vivo deterioration and to investigate the influence of the cement thickness on the marginal deterioration. It was confirmed that the in vitro acceleration test, which was a total of 1,600 cyclic wear loadings, successfully reproduced the in vivo three-sequential marginal deterioration quantitatively and morphologically. Significantly less marginal deterioration was observed in a specimen with the cement width of 100 μm (ANOVA and Scheffe's F test, p<0.05). It was suggested that cement width should be less than 100 μm to minimize the marginal deterioration of ceramic inlays.A significant correlation was found to exist between explorer tip diameter and the Alfa/Bravo boundary for horizontal gaps, but not for vertical steps. It was suggested that visual inspection aided and unaided with loupes had no significant effect on the evaluation of simulated marginal discrepancies. The findings highlight the importance of the traditional dental explorer - in the absence of a more discriminatory device, in the assessment of marginal discrepancies in restorations. Less