The effects of bonding system and light curing method on reducing stress of different C-factor cavities.
The effects of bonding system and light curing method on reducing stress of different C-factor cavities.
复制标题
粘合体系和光固化方法对降低不同C因子腔体应力的影响。
DOI：
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发表时间：
2001
影响因子：
3.3
通讯作者：
J. Tagami
中科院分区：
文献类型：
--
作者：
T. Yoshikawa;Michael F. Burrow;J. Tagami
目的
研究了慢启动固化方法对不同C因子树脂复合修复体边缘封闭性和洞壁适合性的影响。
方法
在平坦的牛牙本质表面制备深1 mm、直径3 mm(C因子=2.3)或直径2 mm(C因子=3)的圆柱形空洞。牙体修复后使用Clearfi Photo Bond、Clearfi Liner Bond 2或Super-Bond D Liner粘接系统，然后使用Photo Clearfi Bright复合体。用常规的固化方法，用600 mW/cm~2(针尖到树脂的距离0 mm)固化60 S，或用270 mW/cm~2(尖端到树脂的距离10 mm)的慢速固化方法固化10 S，然后5-S间隔，然后以600 mW/cm~2的速度固化50 S。热循环后，进行染料渗透试验。染料渗透长度以空腔总壁长的百分比计算。
结果
当C因子从2.3增加到3时，空洞-壁隙的形成增加，除了一种材料--Super-Bond D衬垫，无论光固化方法和C因子如何，该材料都表现出良好的边缘密封性和树脂复合材料对空洞壁的适应性。
结论
当使用树脂复合体修复C系数较高的空洞时，必须小心。柔性胶粘剂和慢启动固化方法的结合似乎能有效地降低大C因子空腔的聚合收缩应力。
PURPOSE
The effect of the slow-start curing method on the marginal sealing and cavity wall adaptation on resin composite restorations with different C-factors was evaluated.
METHODS
Cylindrical cavities, 1 mm deep and 3 mm in diameter (C-factor=2.3) or 2 mm in diameter (C-factor=3) were prepared on flat superficial bovine dentin surfaces. The teeth were restored with Clearfil Photo Bond, Clearfil Liner Bond 2 or Super-Bond D Liner adhesive systems followed by Photo Clearfil Bright composite. The resins were cured with a conventional method using 600 mW/cm2 (tip-to-resin distance 0 mm) for 60 s, or the slow-start curing method of 270 mW/cm2 (tip-to-resin distance 10 mm) for 10 s, followed by a 5-s interval, then 50 s at 600 mW/cm2. After thermocycling, a dye penetration test was carried out. The dye penetration length was calculated as a percentage of the total cavity wall length.
RESULTS
Cavity-wall gap formation increased when the C-factor increased from 2.3 to 3, except in one material, Super-Bond D Liner, which showed good marginal sealing and resin composite adaptation to the cavity wall regardless of light curing method and C-factor.
CONCLUSION
It is necessary to take care when a cavity with a high C-factor is to be restored with resin composite. The combination of a flexible adhesive and the slow-start curing method would seem to be effective in reducing polymerization contraction stress for large C-factor cavities.