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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.

光固化树脂基复合材料因其美观、使用方便、与牙体结构良好的粘接以及力学性能的改善而广泛应用于临床。然而，光固化树脂复合材料的聚合反应比自固化树脂复合材料快，树脂与空腔墙/地面之间的空隙比自固化树脂复合材料大，本课题旨在评价光固化方法对树脂复合材料边缘密封性和空腔墙适应性的影响，以及对树脂复合材料体顶面和底面硬度的影响;在平坦的牛牙本质表面上制备圆柱形空腔。牙体先用粘接剂系统修复，再用光固化复合材料修复。用NEW LIGHT VL-II固化树脂。（VL-II，GO）、Co-bee（CBS GO）和实验光固化单元（EP，GO）;组1：VL-II 700 mW/cm^2 s;组2：OB（斜坡固化）210 mW/cm ^2至700 mW/cm ^2 5 s + 700 mW/cm ^2 s;组3：EP（步进固化）270 mW/cm ^2 s + 5 s（间隔）+600 mW/cm ^2 50 s。在500和5500之间进行500次热循环，停留时间为30秒后，进行腔边缘周围的染料渗透测试和切割表面上的腔壁适应性测试。染料渗透长度计算为腔壁总长度的百分比。斜坡和阶梯固化显着改善边缘密封和树脂复合材料适应腔壁。这些慢启动固化方法导致加速树脂复合物的底表面处的硬化。