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Cavity acaptation and effect on the elasticity of the hybrid layer of light-cured resin composites irradiated at a low light intensity

低光强照射下光固化树脂复合材料杂化层的空穴捕获及其对弹性的影响

基本信息

批准号：
10671787
负责人：
TANAKA Toru
金额：
$ 1.41万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Light-initiated polymerization at low intensity reduces contraction stresses of resin composites and the improvement of cavity adaptation is attempted. However, the light intensity has a large effect on the degree of conversion particularly at the bottom of a composite restoration. Then the light intensity of the light transmitted through 1, 2 or 3 mm thick resin composites (3 products, 4-6 shades) was measured. The output to the lamp of light source is 7, 8, 9, 10, 11 or 12 V. As the result, there was a significant difference in the transmitted light intensity among products and shades at either output. "Slow setting" method (250mW/cmィイD12ィエD1 × 20s, 10s pause, 600 mW/cmィイD12ィエD1 × 20s) which applied the light-initiated polymerization at low intensity was compared with the usual irradiation method (700 mW/cm2 × 40s). And there was a significant difference in the adaptation of cylindrical dentin cavity among used dentin adhesive systems and it tended to show cavity adaptation in which … More "slow setting" method was good at the line angle and cavity floor. In addition, in order to examine elasticity of the hybrid layer and its surrounding area the elasticity of dentin surfaces, etched/primed dentin surfaces and bonding resin surfaces was calculated from the indentation depth measured by an indentation tester. The elasticity of 2 mm thick resin composites irradiated at low light intensity (8V) and usual light intensity (11V) was also calculated. Used materials were 3 dentin adhesive systems (One-step, Singlebond, Liner bond II Σ) and 3 resin composites (Aelitefil, Z100, AP-X).As the result, in Liner bond IIΣ, there was no significance between the etched/primed dentin surface and the bonding resin surface but there was the significance in One-step and Singlebond. Though in 8V, there was no significance except for Singlebond between the bonding resin surface and the resin composite basal surface, in 11V, there was the significance in all 3 types (One-step/Aelitefil,Singlebond/Z100, Liner bond II Σ/AP-X). Less

在低强度下的光引发聚合降低树脂复合材料的收缩应力，并尝试改善腔适应性。然而，光强度对转换程度有很大的影响，特别是在复合修复体的底部。然后测量透过1、2或3 mm厚的树脂复合材料（3种产品，4-6种色调）的光的光强度。光源灯的输出为7、8、9、10、11或12 V。结果，在任一输出下，产品和色调之间的透射光强度存在显著差异。采用低强度光引发聚合的“慢固化”法（250 mW/cm × 12 × 12 × 12 × 20 s，间歇10 s，600 mW/cm × 12 × 12 × 20 s）与常规辐照法（700 mW/cm ~ 2 × 40 s）进行了比较。不同粘接剂对圆柱形牙本质洞的适应性差异显著， ...更多信息 “慢凝”法对线角和空洞底面的处理效果较好。此外，为了检查混合层及其周围区域的弹性，根据压痕测试仪测量的压痕深度计算牙本质表面、蚀刻/涂底漆的牙本质表面和粘结树脂表面的弹性。计算了2 mm厚树脂复合材料在低光强（8V）和常光强（11 V）下的弹性。实验材料为One-step、Singlebond、Liner bond II和3种树脂复合材料（Aelitefil、Z100、AP-X），结果显示：Liner bond II和3种树脂复合材料中，酸蚀/预处理牙本质表面与树脂表面之间无显著性差异，One-step和Singlebond有显著性差异。虽然在8V下，除Singlebond外，粘结树脂表面与树脂复合材料基底表面之间无显著性差异，但在11 V下，所有3种类型（One-step/Aelitefil，Singlebond/Z100，Liner bond II/AP-X）均存在显著性差异。少