Munari Laís S, Cornacchia Tulimar P M, Moreira Allyson N, Gonçalves Jason B, De Las Casas Estevam B, Magalhães Cláudia S
Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, CEP 31270-901, Belo Horizonte, MG, Brazil,
Med Biol Eng Comput. 2015 Aug;53(8):751-8. doi: 10.1007/s11517-015-1289-4. Epub 2015 Apr 8.
The aim of this study was to compare the areas of stress concentration in a three-dimensional (3D) premolar tooth model with anisotropic or isotropic enamel using the finite element method. A computed tomography was imported to an image processing program to create the tooth model which was exported to a 3D modeling program. The mechanical properties and loading conditions were prescribed in Abaqus. In order to evaluate stresses, axial and oblique loads were applied simulating realistic conditions. Compression stress was observed on the side of load application, and tensile stress was observed on the opposite side. Tensile stress was concentrated mainly in the cervical region and in the alveolar insertion bone. Although stress concentration analyses of the isotropic 3D models produced similar stress distribution results when compared to the anisotropic models, tensile stress values shown by anisotropic models were smaller than the isotropic models. Oblique loads resulted in higher values of tensile stresses, which concentrate mainly in the cervical area of the tooth and in the alveolar bone insertion. Anisotropic properties must be utilized in enamel stress evaluation in non-carious cervical lesions.
本研究的目的是使用有限元方法比较具有各向异性或各向同性釉质的三维（3D）前磨牙模型中的应力集中区域。将计算机断层扫描导入图像处理程序以创建牙齿模型，然后将其导出到3D建模程序。在Abaqus中规定力学性能和加载条件。为了评估应力，模拟实际情况施加轴向和斜向载荷。在加载侧观察到压缩应力，在相对侧观察到拉伸应力。拉伸应力主要集中在颈部区域和牙槽骨植入处。尽管与各向异性模型相比，各向同性3D模型的应力集中分析产生了相似的应力分布结果，但各向异性模型显示的拉伸应力值小于各向同性模型。斜向载荷导致更高的拉伸应力值，其主要集中在牙齿的颈部区域和牙槽骨植入处。在非龋性颈部病变的釉质应力评估中必须考虑各向异性特性。
