用布喇格光纤光栅传感器测定口腔复合树脂材料光固化收缩与温度演化特性

复合树脂材料已成为重要的牙齿美容修复材料.本文利用两种布喇格光纤光栅传感器测定了口腔复合树脂材料在光固化过程中的收缩与温度演化特性.一种为普通的光纤布喇格光栅,另一种为经过了化学镀镍的光纤布喇格光栅,同时埋入复合树脂样品中,用光照射使其固化,测得光纤布喇格光栅在固化过程中温度和应力随时间的演化曲线.实验结果表明,在光固化过程中,因为聚合反应,树脂产生了强烈的收缩应力和温度变化.掌握复合树脂的光固化收缩特性和温度变化特性对不断改良材料性能以及优化口腔材料的治疗效果具有实际意义.

Evaluation of Shrinkage Stress and Exotherm during Light-curing of Dental Resin Composites

Light-cured composite resin is an important material in densitry for beauty and restoration. Fiber Bragg gratings(FBG) is used to determine composite resin shrinkage during the light-curing. Because FBGs are both sensitivity to temperature and strain, two different kinds of FBGs were used to calculate the temperature and strain respectively. One of the FBG was bare, and the other was chemical plated FBG, both of which were embedded in one sample of resin simultaneously. LED light source was used for light curing. Real time changes of temperature and shrinkage strain were gained. The experiments showed that the resin expressed strong shrinkage strain and temperature variation because of the polymerization reaction during the curing. The results are helpful for understanding the shrinkage and temperature change of the materials and improving more prefecable treatment effect.