Weibull analysis and flexural strength of hot-pressed core veneered ceramic structures
Weibull analysis and flexural strength of hot-pressed core veneered ceramic structures
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DOI：
10.1016/s0109-5641(03)00010-1
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发表时间：
2003-11-01
期刊：
影响因子：
5
通讯作者：
DeHoff, PH
中科院分区：
文献类型：
--
作者：
Della Bona, A;Anusavice, KJ;DeHoff, PH
Objective.为了检验假设的Weibull模量的单层和多层陶瓷的控制主要由核心陶瓷的结构可靠性。7组共20个钢筋试件（25 × 4 × 1.2mm）由以下材料制成：（1）IPS Empress（R）-热压（HP）白榴石基芯陶瓷;（2）IPS Empress 2（R）-HP锂基芯陶瓷;（3和7）Evision（R）-HP锂基芯陶瓷（ES）;（4）IPS Empress 2（R）主体-玻璃饰面;（5）ES（1.1 mm厚）加釉层（0.1 mm）;和（6）ES（0.8 mm厚）加饰面（0.3 mm）和釉（0.1 mm）。将每个样本浸入37 ℃蒸馏水中，以0.5 mm/min的十字头速度进行四点弯曲加载，但在干燥环境中进行测试的第7组除外。记录失效载荷，并使用SEM检查断裂表面。采用方差分析和邓肯多重极差检验进行统计学分析。在第2、3、5和6组的平均弯曲强度值之间或第1和4组之间未发现显著差异（p > 0.05）。然而，在干燥（第7组）和潮湿（第1-6组）条件下发现了显著差异。上釉对弯曲强度或威布尔模量没有显著影响。ES陶瓷的强度和Weibull模量与第5组和第6组相似。饰面型芯陶瓷的结构可靠性主要受型芯陶瓷的可靠性控制。(C)2003年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objective. To test the hypothesis that the Weibull moduli of single- and multilayer ceramics are controlled primarily by the structural reliability of the core ceramic.Methods. Seven groups of 20 bar specimens (25 X 4 X 1.2 mm) were made from the following materials: (1) IPS Empress(R)-a hot-pressed (HP) leucite-based core ceramic; (2) IPS Empress2(R)-a HP lithia-based core ceramic; (3 and 7) Evision(R)-a HP lithia-based core ceramic (ES); (4) IPS Empress2(R) body-a glass veneer; (5) ES (1.1 mm thick) plus a glaze layer (0.1 mm); and (6) ES (0.8 mm thick) plus veneer (0.3 mm) and glaze (0.1 mm). Each specimen was subjected to four-point flexure loading at a cross-head speed of 0.5 mm/min while immersed in distilled water at 37 degreesC, except for Group 7 that was tested in a dry environment. Failure loads were recorded and the fracture surfaces were examined using SEM. ANOVA and Duncan's multiple range test were used for statistical analysis.Results. No significant differences were found between the mean flexural strength values of Groups 2, 3, 5, and 6 or between Groups 1 and 4 (p > 0.05). However, significant differences were found for dry (Group 7) and wet (Groups 1-6) conditions. Glazing had no significant effect on the flexural strength or Weibull modulus. The strength and Weibull modulus of the ES ceramic were similar to those of Groups 5 and 6.Significance. The structural reliability of veneered core ceramic is controlled primarily by that of the core ceramic. (C) 2003 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.