Ozdemir Ali Kemal, Polat Nilüfer Tülin
Department of Prosthodontics, School of Dentistry, Cumhuriyet University, Sivas, Turkey.
Dent Mater J. 2003 Dec;22(4):600-9.
The aim of this study was to evaluate the effect of glass fiber distribution on the transverse strength and surface smoothness of conventional heat cured acrylic and autopolymerizing acrylic of an injection-molding system. Forty rectangular (65x10x2.5 mm) acrylic test specimens were prepared from both acrylic types: 10 with 5% (w/w) 6 mm length fiber and 10 without fiber for both groups. Transverse strength test was applied to these specimens. Surface samples were taken from the broken and polished surfaces of these specimens and evaluated using SEM. The addition of fiber was found to cause a statistically significant increase in the transverse strength of the injection system's acrylic. In SEM observation it was revealed that there was good adhesion between glass fiber and both acrylic resins. The glass fibers distribution was more even in the injection system's acrylic. It is suggested that injection system's acrylic be fiber-reinforced to reduce denture fractures.
本研究的目的是评估玻璃纤维分布对注塑系统中传统热固化丙烯酸树脂和自凝丙烯酸树脂横向强度及表面光滑度的影响。从这两种丙烯酸树脂类型中制备了40个矩形（65×10×2.5毫米）丙烯酸测试样本：两组各有10个含5%（重量/重量）6毫米长纤维的样本和10个无纤维的样本。对这些样本进行横向强度测试。从这些样本的断裂和抛光表面获取表面样本，并使用扫描电子显微镜（SEM）进行评估。结果发现添加纤维会使注塑系统丙烯酸树脂的横向强度有统计学上的显著提高。在扫描电子显微镜观察中发现，玻璃纤维与两种丙烯酸树脂之间有良好的附着力。注塑系统丙烯酸树脂中的玻璃纤维分布更均匀。建议对注塑系统的丙烯酸树脂进行纤维增强，以减少义齿断裂。
