弱光引导固化对复合树脂收缩应力影响的研究  

Influence of soft-start irradiation on polymerization shrinkage stress of universal hybrid composite resins

作　　者：亢彦强[1] 赵守亮[2] 李芳[1] 封纯真[1] 

机构地区：[1]第四军医大学口腔医学院牙体牙髓科 [2]同济大学口腔医学院口腔内科

出　　处：《中华口腔医学杂志》2007年第10期633-636,共4页Chinese Journal of Stomatology

基　　金：陕西省科学技术研究发展计划项目[2004K16-G4(5)]

摘　　要：目的通过对比弱光引导固化和传统方式固化两种方式下复合树脂收缩应力的差异,探讨弱光引导固化减小树脂收缩应力的机制。方法自制环氧树脂圆盘,在其中心制备直径为4 mm的圆孔,使用3种复合树脂 A(Charisma)、B(TPH Spectrum)和 C(Esthet-X)各充填16个样本,其中每种树脂8个样本使用弱光引导固化(弱光引导固化组),8个样本使用传统方式固化(传统方式固化组)。于固化后不同时间用光弹法测量和计算收缩应力的大小。结果树脂 A、B、C 弱光引导固化组收缩应力的变化趋势与传统方式固化组基本相同,固化后24h 收缩应力分别为(3.80±0.31)MPa、(3.21±0.40)MPa、(2.84±0.22)MPa,而传统方式固化组收缩应力分别为(4.19±0.24)MPa、(3.69±0.33)MPa、(3.14±0.28)MPa。3种树脂两种固化方式固化后24h 的收缩应力差异均有统计学意义(P<0.05)。结论弱光引导固化能降低复合树脂固化后的收缩应力。Objective To compare the difference between soft-start curing mode and standard curing mode in polymerization shrinkage stress of universal hybrid composite resins and to study effect of the soft-start curing mode on the decrease of shrinkage stress. Methods Three universal hybrid resins （ A ： Charisma,B：TPH Spectrum, and C：Esthet-X） were respectively filled in cavities （4 mm in diameter） of epoxide resin disks, 16 specimens of each. Off them, eight of the specimens for each composite resin were exposed using soft-start mode and the other eight using standard mode. Polymerization contraction stress was calculated during 48 h after curing with photo-elastic stress analysis. Results Three composite resins cured with soft-start mode showed the same trend of shrinkage stress changing as that with standard curing mode and values of polymerization shrinkage stress at 24 h after curing were （3.80 ± 0. 31 ） MPa, （3.21 ± 0.40） MPa, and （2.84 ±0. 22） MPa respectively for A, B and C composite resins. The corresponding figures for the composites with standard curing mode were （4. 19 ±0. 24） MPa, （3.69 ±0. 33） MPa, and （3.14 ± 0. 28 ） MPa. Three composite resins cured with soft-start mode had significantly lower polymerization shrinkage stress compared with standard curing mode at 24 h after curing （P 〈 0. 05 ）. Conclusions Using soft-start curing mold can reduce, to some extent, the polymerization shrinkage stress of universal hybrid composite resins.

关 键 词：复合树脂类 应力 物理 光弹应力分析 光固化 

分 类 号：R783.3[医药卫生—口腔医学]