Garoushi Sufyan, Vallittu Pekka K, Lassila Lippo V J
Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, FI-20520 Turku, Finland.
Acta Biomater. 2007 Sep;3(5):779-84. doi: 10.1016/j.actbio.2007.02.007. Epub 2007 Apr 8.
The aim of this work was to determine the static load-bearing capacity of posterior composite crowns made of experimental composite resin (FC) with short fiber fillers and a semi-interpenetrating polymer network (IPN) matrix. In addition, we wanted to investigate how load-bearing capacity of surface composite resins was affected by substructures of fiber-reinforced composite (FRC) and FC, and by different curing systems. Five groups of crowns were fabricated (n=6). The crowns were either polymerized with a hand-light curing unit (LCU) or cured in a vacuum curing device (VLC) before they were statically loaded at a speed of 1mm min(-1) until fracture. Failure modes were visually examined. Data were analyzed using ANOVA. ANOVA revealed that crowns made from the FC had a statistically significant higher load-bearing capacity than the control PFC composite. Crowns with FRC substructure and PFC covering gave force values of 348N (LCU) and 1199N (VLC), respectively, which were lower than the values of FC composite. No statistically significant difference was found between crowns made from plain FC composite and those made from FC composite with a surface layer of PFC (P=0.892 and 1.00). Restorations made from short glass fiber-containing composite resin with IPN-polymer matrix showed better load bearing capacity than those made with either plain PFC or PFC reinforced with FRC substructure.
这项工作的目的是确定由含短纤维填料的实验性复合树脂（FC）和半互穿聚合物网络（IPN）基体制成的后牙复合冠的静态承载能力。此外，我们想研究纤维增强复合材料（FRC）和FC的子结构以及不同的固化系统如何影响表面复合树脂的承载能力。制作了五组牙冠（n = 6）。在以1mm/min（-1）的速度进行静态加载直至断裂之前，牙冠要么用手持式光固化机（LCU）聚合，要么在真空固化装置（VLC）中固化。目视检查失效模式。使用方差分析（ANOVA）对数据进行分析。方差分析显示，由FC制成的牙冠的承载能力在统计学上显著高于对照PFC复合材料。具有FRC子结构和PFC覆盖层的牙冠的力值分别为348N（LCU）和1199N（VLC），低于FC复合材料的值。由普通FC复合材料制成的牙冠与由带有PFC表层的FC复合材料制成的牙冠之间未发现统计学上的显著差异（P = 0.892和1.00）。由含短玻璃纤维的复合树脂与IPN聚合物基体制成的修复体显示出比由普通PFC或用FRC子结构增强的PFC制成的修复体更好的承载能力。
