用聚合收缩仪Acuvol测定填料含量对复合树脂聚合收缩率的影响

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Syn D6树脂、含74%填料的Syn Compact Nano树脂和含55%填料的Syn Flow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650 mW/cm²卤灯固化40 s（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：Syn Flow>Syn Compact Nano>Syn D6。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（multiple-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。

Effect of filler content of composite resins on polymerization shrinkage measured by a video imaging apparatus (Acuvol)

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...