Suliman A H, Boyer D B, Lakes R S
Department of Conservative Dentistry, College of Dentistry, University of Mosul, Iraq.
J Prosthet Dent. 1994 Jan;71(1):7-12. doi: 10.1016/0022-3913(94)90247-x.
Polymerization shrinkage of two posterior composite resin restorative materials was measured by dilatometry. The results were compared with a decrease in cavity width of MOD preparations in extracted premolars restored with the composite resins. A highly filled hybrid composite exhibited greater free shrinkage and cuspal deformation than a hybrid composite with a lower filler content. Deformation of the cusps was less than the unrestricted shrinkage of the composite resins. Hydrated teeth exhibited less deformation than dehydrated teeth because of polymerization shrinkage. Greater cuspal deformations were measured with the microscopic technique than with interferometry because of differences in experimental design.
通过膨胀测量法测量了两种后牙复合树脂修复材料的聚合收缩率。将结果与用复合树脂修复的离体前磨牙中MOD洞形宽度的减小情况进行了比较。与填料含量较低的混合复合树脂相比，高填料含量的混合复合树脂表现出更大的自由收缩率和牙尖变形。牙尖的变形小于复合树脂的无限制收缩。由于聚合收缩，水合牙比脱水牙表现出更小的变形。由于实验设计的差异，用显微镜技术测量的牙尖变形比用干涉测量法测量的更大。
