Light curing method for reducing polymerization contraction stress of light-cured composite restorations

降低光固化复合修复体聚合收缩应力的光固化方法

基本信息

批准号：
13671996
负责人：
YOSHIKAWA Takako
金额：
$ 2.24万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13671996/
关键词：
polymerization contraction stress resin composite light curing method slow-start curing method stepped curing method ramped curing method marginal leakage cavity wall adaptation Slow-start curing 法フロアブルレジン辺縁封鎖性 Ramp射照法辺縁封鎖法曲げ

项目摘要

Light-cured resin-based composites are widely used in clinical practice because of the esthetic advantages, ease of use, excellent bonding to tooth structure, and improved mechanical properties.' However, the polymerization reaction of light-cured resin composites is faster than that of self-cured composites, which creates more gaps between the resin and cavity wall/floor than self-cured resin composites.This projects was to evaluate the effect of light curing methods on the marginal sealing and cavity wall adaptation of resin composite restorations, and on the hardness at the top and bottom surfaces of a body of resin composite; Cylindrical cavities were prepared on flat bovine dentin surfaces. The teeth were restored with adhesive systems followed by light-cured composite. The resins were cured with NEW LIGHT VL-ll (VL-ll, GO), Co-bee (CBS GO) and experimental light curing unit (EP, GO); Group 1: VL-ll 700 mW/cm^2 s; Group 2: OB (Ramped curing) 210 mW/cm^2 to 700 mW/cm^2 5 s + 700 mW/cm^2 s; Group 3: EP (Stepped curing) 270 mW/cm^2 s + 5 s (interval) + 600 mW/cm^2 50 s. After thermocycling for 500 cycles between 500 and 5500 with a dwell time' 30 second, dye penetration tests around the cavity margin and cavity wall adaptation on cut surface were carried out. Dye penetration length was calculated as a percentage of the total cavity wall length.The ramped and stepped curing significantly improved marginal sealing and resin composite adaptation to the cavity wall. These slow-start curing methods caused accelerating the hardening at the bottom surfaces of the resin composite.

基于美化的树脂复合材料在临床实践中广泛使用，因为具有审美优势，易用性，与牙齿结构的良好结合以及改善的机械性能。然而，固化的树脂复合材料的聚合反应比自我固化的复合材料的速度快，这比自我固化的树脂复合材料在树脂和空腔壁/地板之间产生更多的差距。该项目是评估光固化方法对边际密封壁和空洞组合材料的填充材料和填充材料的效果以及在填充材料中的效果和底层的效果，并在填充材料的底漆上和均可量的完整性，并在整个填充材料中均可予以选择。在扁平的牛牙本质表面上制备圆柱形腔。用粘合剂系统恢复牙齿，然后再固定复合材料。将树脂用新的光VL-LL（VL-LL，GO），Co-Bee（CBS GO）和实验光固化单元（EP，GO）固化；第1组：VL-LL 700 MW/CM^2 S;第2组：OB（坡道固化）210 mW/cm^2至700 mW/cm^2 5 s + 700 mW/cm^2 s;第3组：EP（阶梯固化）270 mW/cm^2 s + 5 s（间隔） + 600 mW/cm^2 50 s。在30秒停留时间的500至5500之间进行500个循环的热环细胞，进行了腔缘周围的染料穿透试验，并在切割表面进行了腔壁适应。染料渗透长度的计算是总腔壁长度的一定百分比。升级和逐步固化可显着改善边际密封和树脂复合对空腔壁的适应性。这些缓慢的固化方法导致在树脂复合材料的底部表面加速加速。