PROTECTION HYPOTHESIS FOR COMPOSITE WEAR
PROTECTION HYPOTHESIS FOR COMPOSITE WEAR
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DOI：
10.1016/0109-5641(92)90105-l
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发表时间：
1992-09-01
期刊：
影响因子：
5
通讯作者：
HEYMANN, HO
中科院分区：
文献类型：
--
作者：
BAYNE, SC;TAYLOR, DF;HEYMANN, HO
在没有直接接触对方牙齿的后方复合修复体上，除了接触处的磨损外，还会发生显著的咬合磨损(无接触磨损)。最近的研究表明，所有的咬合后方复合表面都会磨损，而且这些表面的磨损率随着时间的推移而下降。这为Jorgensen等人提出的早期理论提供了更多的证据。(1979)，复合无接触磨损是由食品团中的小颗粒引起的接触和磨损的函数。这一假说现在被称为“保护理论”或“保护假说”。宏观保护或‘’遮蔽物‘’磨损是由空洞准备墙提供的。由紧密相连的填料颗粒提供微观保护，防止树脂基质磨损。支持保护假说的临床证据来自最近证实的微填充和混杂复合材料的低磨损率。这项工作的目的是计算微观保护(耐磨性)所需的最小颗粒间距，这是基于分散和团聚条件下的填充分数(0.68)和小颗粒(0.02微米半径)的假设。粒子间距(IPS)为
Significant occlusal wear occurs on posterior composite restorations in areas without direct contact with opponent teeth (contact-free wear) in addition to wear at the contacts. Recent research has indicated that all occlusal posterior composite surfaces wear, and those surfaces show decreasing wear rates over time. This provides more evidence for an earlier theory proposed by Jorgensen et al. (1979) that composite contact-free wear is a function of access and attrition caused by small particles in the food bolus. This hypothesis is now called the ''protection theory'' or ''protection hypothesis'' for wear. Macroscopic protection or ''sheltering'' from wear is provided by cavity preparation walls. Microscopic protection against resin matrix wear is provided by filler particles that are close together. Clinical evidence supporting the protection hypothesis comes from recently confirmed low wear rates for microfill and hybrid composites. The objective of this work was to calculate the minimum inter-particle spacing required for microscopic protection (wear resistance) for composites based on assumptions of packing fractions (0.68) with small particles (0.02 mum radius) for dispersed versus agglomerated conditions. An inter-particle spacing (IPS) of