The Effects of Light Intensity and Light-curing Time on the Degree of Polymerization of Dental Composite Resins

被引：24

作者：

Baek, Chang-Jun ^{[1
,2
]}

Hyun, Seok-Hee ^{[3
]}

Lee, Sang-Kyu ^{[1
,2
]}

Seol, Hyo-Joung ^{[1
,2
]}

Kim, Hyung-Il ^{[1
,2
]}

Kwon, Yong Hoon ^{[1
,2
]}

机构：

[1] Pusan Natl Univ, Coll Dent, Dept Dent Mat, Pusan 602739, South Korea

[2] Pusan Natl Univ, Med Res Inst, Pusan 602739, South Korea

[3] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

来源：

DENTAL MATERIALS JOURNAL | 2008年 / 27卷 / 04期

关键词：

Light intensity; Light-curing time; Polymerization;

D O I：

10.4012/dmj.27.523

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

The aim of this study was to investigate the effects of light intensity and light-curing time on the polymerization of composite resins. Four composite resins were light-cured with different, light-curing conditions. In the. non-thermocycled case, specimens showed almost the same or similar microhardness values if energy density was identical or similar. As the energy density decreased, maximum polymerization shrinkage decreased. At higher energy densities. specimens had :I lower coefficient of thermal expansion than at lower energy densities. At the same or similar energy density, most resin products showed coefficient values which were not statistically different. After 10,000 thermocycles, specimens showed decreases of 2.4-16.5% and 4.6-25.2% in microhardness and coefficient of thermal expansion respectively. Within the limitations of the present study, it, was found that light-curing composite resins with higher energy density was beneficial to acquiring higher microhardness values and lower coefficients of thermal expansion.

引用

页码：523 / 533

页数：11