光照时间对自制光固化型牙科玻璃纤维桩弯曲强度影响的实验研究
CHINESE JOURNAL OF AESTHETIC MEDICINE（2009）
Abstract
目的:研究光照时间对自制光固化型牙科玻璃纤维桩弯曲强度的影响.方法:自行合成制作光固化型牙科玻璃纤维桩三点弯曲试件20个,随机分为4组(5个/组),分别进行20s、40s、60s、80s光照固化,测三点弯曲强度,进行单因素方差分析和LSD-t检验.结果:各组弯曲强度为525.76MPa、568.27MPa、602.93MPa和604.12MPa;统计学分析显示,60s组与80s组无显著性差异(P＞0.05),20s组、40s组和60s组或80s组两两间有显著性差异(P＜0.05).结论:自制光固化型牙科玻璃纤维桩的弯曲强度随光照时间的延长而提高,60s后趋于平稳,综合考虑材料固化后的弯曲强度和临床操作效率,其理想光照时间为60s.
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