Role of filler and functional group conversion in the evolution of properties in polymeric dental restoratives.
Role of filler and functional group conversion in the evolution of properties in polymeric dental restoratives.
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DOI：
10.1016/j.dental.2014.02.015
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发表时间：
2014-05
期刊：
影响因子：
5
通讯作者：
Stansburya, Jeffrey W.
中科院分区：
文献类型：
--
作者：
Shah, Parag K.;Stansburya, Jeffrey W.
关键词：
目的研究硅烷化钡玻璃填充光固化二甲基丙烯酸酯树脂的收缩应力和弹性模量随甲基丙烯酸酯转化率和填充量的变化规律。改变辐照时间和强度以实现大范围的转化。收缩应力的测量伴随着实时的转换率监测，同时在不同的静态转换点进行收缩和弹性系数的测量。结果收缩随着转换率的增加几乎呈线性增加，而对于给定的转换值，随着填料含量的增加而成比例地下降。模量值随转化率呈指数增长，也随填料含量的增加而增加；然而，对于填充量最高的材料，模量值的增加不成比例地迅速。无论是高填充量还是低填充量，极限转化率处的应力都很高，与填充量成反比，而在中等填充量时，由于填料的收缩减少、限制的极限转化率和适度提高的弹性模量的综合作用，应力最小。由转化率-指数收缩和模量值预测的聚合应力水平高估了由于体系顺应性而导致的模量值的变化，这在一定程度上模拟了光固化粘结复合材料修复体的临床情况。单体转化率的显著性测量为合理比较不同材料的性能提供了共同的基础。
ObjectivesTo examine effects of shrinkage and modulus on the dynamic development of shrinkage stress as a function of methacrylate conversion and filler loading in a model photocurable dimethacrylate-based resin with a silanized barium glass filler.MethodsBisGMA/TEGDMA samples with filler loading levels of 0–70 wt% were evaluated. Irradiation times and intensities were varied to achieve a wide range of conversion. Shrinkage stress measurements were accompanied with real-time conversion monitoring, while shrinkage and modulus measurements were made at different static conversion points.ResultsShrinkage increased nearly linearly with respect to conversion, while for a given value of conversion, it decreased proportionally with increasing filler content. Modulus advanced in an exponential fashion with conversion and also increased incrementally with filler content; however, modulus values rose disproportionately rapidly for the highest filler loading. At either high or low filler loading levels, stress at limiting conversion, which was inversely proportional to the filler load, was high while at an intermediate filler content, a minimum in stress was observed due to the combined effects of filler based shrinkage reduction, restricted limiting conversion and only moderately enhanced modulus. The level of polymerization stress predicted from the conversion-indexed shrinkage and modulus measurements over-estimated the experimental stress states as modulus evolved due to system compliance that to some degree mimics the clinical situation presented by photocuring bonded composite restorations.Significance Measurement of monomer conversion provides a common basis by which different material properties can be rationally compared.
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DOI：
10.14219/jada.archive.2000.0207
发表时间：
2000-04-01
影响因子：
3.9
作者：
Condon, JR;Ferracane, JL
通讯作者：
Ferracane, JL
影响因子：
9.7
作者：
Howard, Benjamin;Wilson, Nicholas D.;Newman, Sheldon M.;Pfeifer, Carmem S.;Stansbury, Jeffrey W.
通讯作者：
Stansbury, Jeffrey W.
影响因子：
5
作者：
FEILZER, AJ;DEGEE, AJ;DAVIDSON, CL
通讯作者：
DAVIDSON, CL
影响因子：
7.6
作者：
DAVIDSON, CL;DEGEE, AJ;FEILZER, A
通讯作者：
FEILZER, A
影响因子：
5
作者：
Arimoto, Ayako;Nakajima, Masatoshi;Tagami, Junji
通讯作者：
Tagami, Junji