de Castro Albuquerque R, Polleto L T de Abreu, Fontana R H B T S, Cimini C A
School of Dentistry and School of Engineering, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
J Oral Rehabil. 2003 Sep;30(9):936-43. doi: 10.1046/j.1365-2842.2003.01154.x.
The effect of different anatomic shapes and materials of posts in the stress distribution on an endodontically treated incisor was evaluated in this work. This study compared three post shapes (tapered, cylindrical and two-stage cylindrical) made of three different materials (stainless steel, titanium and carbon fibre on Bisphenol A-Glycidyl Methacrylate (Bis-GMA) matrix). Two-dimensional stress analysis was performed using the Finite Element Method. A static load of 100N was applied at 45 degrees inclination with respect to the incisor's edge. The stress concentrations did not significantly affect the region adjacent to the alveolar bone crest at the palatine portion of the tooth, regardless of the post shape or material. However, stress concentrations on the post/dentin interface on the palatine side of the tooth root presented significant variations for different post shapes and materials. Post shapes had relatively small impact on the stress concentrations while post materials introduced higher variations on them. Stainless steel posts presented the highest level of stress concentration, followed by titanium and carbon/Bis-GMA posts.
本研究评估了不同解剖形状和材料的桩对根管治疗后的切牙应力分布的影响。本研究比较了由三种不同材料（不锈钢、钛和双酚A-甲基丙烯酸缩水甘油酯（Bis-GMA）基质上的碳纤维）制成的三种桩的形状（锥形、圆柱形和两级圆柱形）。使用有限元法进行二维应力分析。在相对于切牙边缘呈45度倾斜方向施加100N的静载荷。无论桩的形状或材料如何，应力集中对牙齿腭侧牙槽嵴相邻区域均无显著影响。然而，牙根腭侧桩/牙本质界面上的应力集中因桩的形状和材料不同而呈现出显著差异。桩的形状对应力集中的影响相对较小，而桩的材料则使其变化更大。不锈钢桩的应力集中水平最高，其次是钛桩和碳/Bis-GMA桩。
