QUANTITATIVE-DETERMINATION OF STRESS REDUCTION BY FLOW IN COMPOSITE RESTORATIONS
QUANTITATIVE-DETERMINATION OF STRESS REDUCTION BY FLOW IN COMPOSITE RESTORATIONS
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DOI：
10.1016/0109-5641(90)90023-8
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发表时间：
1990-07-01
期刊：
影响因子：
5
通讯作者：
DAVIDSON, CL
中科院分区：
文献类型：
--
作者：
FEILZER, AJ;DEGEE, AJ;DAVIDSON, CL
在这项研究中，研究了四种化学引发复合材料通过流动降低聚合收缩应力的情况与空腔结构的关系。在模拟粘结到洞壁的修复体的实验装置中，记录了几种配置下伴随流动的发展收缩应力作为时间的函数。对于每种结构，也绘制了理论收缩应力曲线，不包括通过流动减少的应力。这些数据是通过测定早期固化阶段的杨氏模数和相应的聚合收缩得到的。通过将理论应力与实验确定的应力进行比较，可以得到粘结状态下流动能力的度量。研究发现，流动强烈地依赖于复合材料的类型和空腔的形状。
In this study, the reduction of the polymerization shrinkage stress by flow of four chemically-initiated composites was investigated in relation to the cavity configuration. In an experimental set-up simulating restorations bonded to cavity walls, the developing shrinkage stress accompanied by flow was recorded as a function of time for several configurations. For each configuration, theoretical shrinkage stress curves were also drawn, excluding stress reduction by flow. These data were obtained from Young's modulus determinations at the early setting stage and the corresponding polymerization shrinkage. By comparison of the theoretical stress with the experimentally determined stress, a measure for the ability to flow in the bonded situation could be obtained. It was found that the flow strongly depended on the type of composite and on the configuration of the cavity.