Post-irradiation hardness of resin-modified glass ionomer cements and a polyacid-modified composite resin

被引：26
|
作者：
Yap, AUJ
机构：
[1] Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore 119 074
来源：
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE | 1997年 / 8卷 / 07期
关键词：
D O I：
10.1023/A:1018501520931
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
This study examined the post-irradiation hardness of resin-modified glass ionomer cements and a polyacid-modified composite resin using a digital microhardness tester. Change in hardness of these materials over a period of 6 months was compared to that of conventional glass ionomer cements and a composite resin. With the exception of the composite resin, all materials showed a significant increase in hardness over 24 h after their initial set. Dual-cure resin-modified glass ionomer cements showed decreased hardness with increased storage time in saline at 37 degrees C. Results suggest that the addition of resins to glass ionomer cements does not improve initial hardness and does not negate the acid-base reaction of conventional cements. Resin addition may, however, lead to increased water sorption and decreased hardness.
引用
收藏
页码：413 / 416
页数：4
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