期刊
JOURNAL OF DENTAL RESEARCH
卷 87, 期 11, 页码 1043-1047出版社
INT AMER ASSOC DENTAL RESEARCHI A D R/A A D R
DOI: 10.1177/154405910808701114
关键词
dental composite; polymerization stress; reaction kinetics; irradiance; volumetric shrinkage
资金
- CAPES (Coordenacao de Aperfeicoamento de Pessoal em Nivel Superior) [BEX 0682/05-5]
Polymerization stress development results from the complex interplay of volumetric shrinkage, reaction kinetics, and viscoelastic properties. The objective of this study was to examine the relationships among volumetric shrinkage, degree of conversion, rate of polymerization (RPmax), and stress development for 2 model bis-GMA-based composites. Three irradiances were used 220, 400, or 600 mW/cm(2) - with exposure times adjusted to deliver the same radiant energy. Volumetric shrinkage was determined with a mercury dilatometer, degree of conversion and RPmax by differential scanning calorimetry (DSC), and polymerization stress with a low-compliance device (Sakaguchi et al., 2004b). Results indicated that polymerization reaction rate and shrinkage were not correlated. Irradiance was directly related to polymerization reaction rate and to stress development. The group with the highest stress/degree of conversion exhibited the lowest RPmax, so it can be assumed, within the limitations of this study, that the conversion was most closely related to stress development.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据