Curing method for reducing polymerization contraction stress of light-curing resin composite

降低光固化树脂复合材料聚合收缩应力的固化方法

• 批准号: 09671947
• 负责人: YOSHIKAWA Takako
• 金额: $ 1.22万
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09671947/
• 关键词: Light-cured resin composite; Slow-start curing method; Polymerization controaction stress; Palymerization behavior; marginal sealing; Cavity wall adaptation; Environmental SEM; Incremental filling technique; 辺縁封鎖法; 重合収縮量; 辺緑封鎖性; 光照射法; 窩低部重合促進

Light-cured resin composites are now widely used in daily clinical practice because of their esthetic advantages, ease of use, good bonding to tooth structure, and improved mechanical properties. However, light-cured resin composites are usually polymerized from the resin surface near a light source, which causes polymerization contraction of the resin composite towards the light. This shrinkage creates more gaps between the resin and cavity wall/floor than self-cured resin composites.This projects was to evaluate the effect of the light wring method on the marginal sealing and cavity wall adaptation on resin composite restorations with different C-factor shapes and also to evaluate the effect of incremental filling technique on resin micro-bond strength to Class I dentin-cavity floors. Moreover, environmental SEM observation was carried out to evaluate on resin-tooth interface using two light curing method.It was concluded that incremental filling technique did not improve dentin micro-bond strength to cavity floor. On the other hand, slow-start curing method ; 270 mW/cm^2 10 s + 5 s (interval) + 600 mW/cm^2 50 s reduce the polymerization contraction stress, and tended to improve marginal sealing and resin composite adaptation to the cavity wall regardless of bonding system and C-factor. Ordinary curing method ; 600 mW/cm^2 60 s resulted in poor marginal sealing and wall adaptation. Environmental SEM observation showed that the slow-start curing method improved resin composite adaptation to the cavity wall and this curing method was effective to the cavities both with and without enamel margin.

固化的树脂复合材料现在被广泛用于日常临床实践中，因为它们具有审美优势，易用性，与牙齿结构的良好结合以及改善的机械性能。但是，光固化的树脂复合材料通常是从光源附近的树脂表面聚合，这会导致树脂复合材料对光的聚合收缩。 This shrinkage creates more gaps between the resin and cavity wall/floor than self-cured resin composites.This projects was to evaluate the effect of the light wring method on the marginal sealing and cavity wall adaptation on resin composite restorations with different C-factor shapes and also to evaluate the effect of incremental filling technique on resin micro-bond strength to Class I dentin-cavity floors.此外，进行了环境SEM观察，以使用两种光固化方法在树脂齿界面上进行评估。结论是，增量填充技术并不能改善牙本质微键强度到腔地板。另一方面，缓慢启动的固化方法； 270 mW/cm^2 10 s + 5 s（间隔） + 600 mW/cm^2 50 s减少了聚合收缩应力，并倾向于改善边缘密封和树脂复合对空腔壁的适应性，而不管粘结系统和C因子无论如何。普通固化方法； 600 mW/cm^2 60 s导致边缘密封和墙壁适应不良。环境SEM观察表明，缓慢启动的固化方法改善了对空腔壁的树脂复合材料的适应，这种固化方法对带有和不具有牙釉质边缘的空腔有效。

项目成果

吉川孝子: "コンポジットレジン修復物の辺縁封鎖性の窩壁適合性の向上法に関する研究-レジン重合法の検討を中心として-" 日本歯科保存学雑誌. 40巻・第5号. 1296-1323 (1997)

Takako Yoshikawa：“改善边缘密封复合树脂修复体腔壁相容性的方法研究 - 专注于树脂聚合方法的研究 -”日本保守牙科杂志，第 40 卷，第 5 期。1296-1323（1997 年） ）

吉川 孝子: "コンポジットレジン修復物の辺縁封鎮性、窩壁適合性の向上法に関する研究 -レジン重合法の検討を中心として-" 日本歯科保存学雑誌. 40巻・第5号. 1296-1323 (1997)

Takako Yoshikawa：“改善复合树脂修复体边缘密封性能和腔壁一致性的方法研究 - 重点研究树脂聚合方法 -”日本保守牙科杂志，第 40 卷，第 5 期。1296-1323（ 1997）