The effect of core:dentin thickness ratio on the bi-axial flexure strength and fracture mode and origin of bilayered dental ceramic composites
The effect of core:dentin thickness ratio on the bi-axial flexure strength and fracture mode and origin of bilayered dental ceramic composites
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DOI：
10.1016/j.dental.2004.01.005
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发表时间：
2005-02-01
期刊：
影响因子：
5
通讯作者：
Marquis, PM
中科院分区：
文献类型：
--
作者：
Fleming, GJP;El-Lakwah, SFA;Marquis, PM
目标.本研究的目的是评估核与牙本质厚度比对双层牙科陶瓷复合材料盘形件的抗弯强度、断裂模式和起源的影响。对30个核与牙本质厚度比分别为2：1、1：1和1：2的双层复合材料盘进行双轴弯曲试验，同时对增强核和贴面牙本质施加拉伸载荷。测定平均弯曲强度、标准差和相关威布尔模量（m）。采用光学显微镜和扫描电子显微镜相结合的方法对断裂模式和来源进行了鉴定。当增强核和贴面牙本质瓷都进行拉伸试验时，核：牙本质比影响双向弯曲强度和弯曲强度数据的可靠性。当核：牙本质厚度为2：1时，强度和可靠性增加。双层牙科陶瓷复合材料盘状试样中断裂碎片的数量、试样分层、赫兹锥形成和亚临界径向裂纹的发生频率也取决于核/牙本质比和表面加载张力。核与牙本质厚度比影响双层陶瓷复合材料试样的双向弯曲强度、断裂方式和断裂起源。(C)2004年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. The aim of the current study was to assess the effect of core:dentin thickness ratio on the flexure strength, fracture mode and origin of bilayered dental ceramic composite disc specimens.Methods. Sets of 30 bilayered composite discs with core:dentin thickness ratio of 2:1, 1:1 and 1:2 were tested in bi-axial flexure with both the reinforcing core and veneering dentin Loaded in tension. Mean flexure strengths, standard deviations and associated Weibull Moduli (m) were determined. A combination of optical and scanning electron microscopy was employed for identification of the fracture mode and origin.Results. The core:dentin ratio influenced the bi-axial flexure strength and reliability of the flexure strength data when both the reinforcing core and veneering dentin porcelain were tested in tension. The strength and reliability was increased for a core:dentin thickness of 2:1. The number of fracture fragments, the frequency of occurrence of specimen delaminations, Hertzian cone formations and sub-critical radial cracking in the bilayered dental ceramic composite disc shaped specimens was also dependent on the core/dentin ratio and the surface loaded in tension.Conclusions. Core:dentin thickness ratio influences the bi-axial flexure strength and fracture mode and origin in bilayered dental ceramic composite specimens. (C) 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.