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光固化复合树脂聚合反应对收缩应力影响的研究进展

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Author:
No author available
Journal Title:
Chinese Journal of Stomatology
Issue:
8
DOI:
10.3760/cma.j.issn.1002-0098.2015.08.005
Key Word:
No keyword available

Abstract: 光固化复合树脂聚合收缩对修复体长期治疗效果影响较大.树脂单体间聚合时,分子间由0.3~0.5 nm转变为0.15 nm的共价键距离[1],分子间作用力由范德瓦耳斯力转变为共价键,宏观表现为聚合性体积收缩,可产生一定的收缩应力,导致复合树脂与牙体间形成数微米的边缘裂隙,出现充填体边缘微渗漏、着色和牙齿术后敏感,以致继发龋和修复体松动脱落[2].复合树脂聚合收缩应力可使牙体及修复体产生应力而发生形变,甚至导致粘接失败、釉质裂纹和牙尖移动[3-4].

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