Rodríguez-Cervantes P J, Sancho-Bru J L, Barjau-Escribano A, Forner-Navarro L, Pérez-González A, Sánchez-Marín F T
Departament d'Enginyeria Mecànica i Construcció, Universitat Jaume I, Castelló, Spain.
J Oral Rehabil. 2007 Feb;34(2):141-52. doi: 10.1111/j.1365-2842.2006.01720.x.
The aim of this study was to test the following hypothesis: biomechanical performance (fracture strength and stress distribution) of restored teeth is less sensitive to post diameter and post length when using glass fibre posts than when using stainless steel posts. First, an experimental fracture strength test was performed on 80 extracted human maxillary central incisors. Teeth were decoronated, treated endodontically and restored (40 with glass fibre posts and 40 with stainless steel posts), and the length and diameter of the posts varied uniformly. Failure loads were recorded and results were compared using an ancova analysis. Secondly, the finite element technique was used to develop a model of the restored tooth. The post diameter had a significant effect on the biomechanical performance of teeth restored with stainless steel posts. Lower failure loads were found as post diameter increased. However, the post diameter of those teeth restored with glass fibre posts, and the post length for both post systems under consideration, did not affect the biomechanical performance of restored teeth to a significant degree. The stress distributions predicted by the developed model corroborated these findings, confirmed the assumed hypothesis, and permitted the proposal of the use of glass fibre posts to achieve a restorative technique that is less sensitive to post dimensions, and thus more robust.
与使用不锈钢桩时相比，使用玻璃纤维桩时，修复后牙齿的生物力学性能（断裂强度和应力分布）对桩直径和桩长度的敏感度更低。首先，对80颗拔除的人上颌中切牙进行了实验性断裂强度测试。将牙齿去冠，进行根管治疗并修复（40颗使用玻璃纤维桩，40颗使用不锈钢桩），桩的长度和直径均匀变化。记录破坏载荷，并使用协方差分析比较结果。其次，使用有限元技术建立修复后牙齿的模型。桩直径对使用不锈钢桩修复的牙齿的生物力学性能有显著影响。随着桩直径增加，破坏载荷降低。然而，使用玻璃纤维桩修复的牙齿的桩直径以及所考虑的两种桩系统的桩长度，在很大程度上并未影响修复后牙齿的生物力学性能。所建立模型预测的应力分布证实了这些发现，证实了假设，并支持使用玻璃纤维桩以实现对桩尺寸敏感度更低、因而更稳固的修复技术这一提议。
