Department of Crown and Bridge, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo 102-8159, Japan.
Dent Mater J. 2011;30(1):29-37. doi: 10.4012/dmj.2010-072. Epub 2011 Jan 26.
The aim of this study was to evaluate the influence of connectors under two different loading conditions on displacement and stress distribution generated in isotropic hybrid composite fixed partial denture (C-FPD) and partially anisotropic fiber-reinforced hybrid composite fixed partial denture (FRC-FPD). To this end, two three-dimensional finite element (FE) models of three-unit FPD from mandibular second premolar to mandibular second molar - intended to replace the mandibular first molar - were developed. The two loading conditions employed were a vertical load of 629 N (applied to eight points on the occlusal surface) and a lateral load of 250 N (applied to three points of the pontic). The results suggested that the reinforcing fibers in FRC framework significantly improved the rigidity of the connectors against any twisting and bending moments induced by loading. Consequently, maximum principal stress and displacement generated in the connectors of FRC-FPD were significantly reduced because stresses generated by vertical and lateral loading were transferred to the reinforcing fibers.
本研究旨在评估在两种不同加载条件下，连接体对各向同性混合复合材料固定局部义齿（C-FPD）和部分各向异性纤维增强混合复合材料固定局部义齿（FRC-FPD）中产生的位移和应力分布的影响。为此，构建了下颌第二前磨牙至下颌第二磨牙的三个单位 FPD 的两个三维有限元（FE）模型——旨在替代下颌第一磨牙。所采用的两种加载条件为 629N 的垂直载荷（施加于咬合面的 8 个点）和 250N 的侧向载荷（施加于桥体的 3 个点）。结果表明，FRC 基架中的增强纤维显著提高了连接体的刚性，使其能够抵抗任何由加载引起的扭曲和弯矩。因此，FRC-FPD 中连接体产生的最大主应力和位移显著降低，因为垂直和侧向加载产生的应力被转移到增强纤维上。
