中文摘要：

目的：研究改变填料含量对复合树脂聚合收缩率的影响,探讨Acuvol聚合收缩仪的应用价值。方法：研究共使用9种复合树脂,包括6种定制的填料含量分别为80%,78%,76%,70%,60%,50%的复合树脂,以及3种复合树脂商品：含80%填料的SynD6树脂、含74%填料的Syn Compact Nano树脂和含55%填料的SynFlow树脂（填料含量均以质量分数表示）。制备半球形树脂样本,用功率为650mW/cm2卤灯固化40s（n=10）,分别使用Acuvol的SVVR模式和MVVR模式测定树脂样本的聚合收缩率。结果：3种商品树脂的聚合收缩率为：SynFlow〉Syn Compact Nano〉SynD6。6种定制树脂的聚合收缩率为填料含量50%〉60%〉70%〉76%〉78%〉80%。商品树脂、配制树脂的填料含量和聚合收缩均呈负相关关系（r为-0.982、-0.968,P〈0.001）。使用多帧成像（mul-tiple-view volumetric reconstruction,MVVR）模式、单帧成像（single-view volumetric reconstruction,SVVR）模式测定复合树脂的聚合收缩率,其结果差异无统计学意义（t=0.385,P〉0.05）。结论：填料含量是影响复合树脂聚合收缩的重要因素,Acuvol聚合收缩仪可以快速、准确地测定复合树脂的聚合收缩率,MVVR模式和SVVR模式结果差异无统计学意义,SVVR模式更加快捷。

英文摘要：

Objective：To investigate the effect of filler content on the polymerization shrinkage of resins and to evaluate whether Acuvol is a simple and easy method in volumetric shrinkage measurement.Methods：Six experimental resins with filler contents of 80%,78%,76%,70%,60%,and 50% were made.Three commercial resins were Syn D6 with 80% filler content,Syn Compact Nano with 74% filler content and Syn Flow with 55% filler content（using the mass fraction to express the filler content）.Small semi-sphere samples of these composites were manually formed and light cured for 40 s using a quartz tungsten halogen unit at 650 mW/cm2（n=10）.The volumetric shrinkage was measured in both SVVR and MVVR modes using Acuvol.Results：The volumetric shrinkage of the three commercial resins were：Syn Flow〉Syn Compact Nano〉 Syn D6.The shrinkage values of the six experimental resins with different filler contents were：50%〉60%〉70%〉76%〉78%〉80%.The negative correlation between filler content and volumetric shrinkage of commercial and experimental resins were strongly （-0.982 and-0.968 respectively,P〈0.001）.No significant difference between SVVR and MVVR modes （t=0.385,P〉0.05）.Conclusion：The present results support the view that filler content is one of the most important factors influencing polymerization shrinkage of composites.Acuvol provides an easy method for measuring polymerization shrinkage of composites.Both SVVR and MVVR modes of Acuvol give reproducible results.