Toparli M, Gökay N, Aksoy T
Department of Metallurgical and Materials Engineering, Faculty of Engineering, Dokuz Eylül University, Bornova, Izmir, Turkey.
J Oral Rehabil. 1999 Feb;26(2):157-64. doi: 10.1046/j.1365-2842.1999.00342.x.
In the first part of this study some physical properties of restorative materials, amalgam, glass-ionomer and composite resin were measured experimentally. In the second part a numerical study was carried out, for which the maxillary second premolar tooth was used. The tooth model was restored with composite resin and amalgam on glass-ionomer, which was used as the base material. The stress distribution investigated was the resultant of the stresses which come from the mastication force and those resulting from the contraction and expansion of restorative materials. All calculations were carried out using the finite element method and programs were written using FORTRAN 77. A load of 450 N, at an angle of 45 degrees to the longitudinal axis was applied on the occlusal margin of the tooth. The tooth was assumed isotropic, homogenous, elastic and unsymmetrical. The distribution of compressive, tensile and shear stresses were plotted for the whole tooth structure.
在本研究的第一部分，对修复材料、汞合金、玻璃离子体和复合树脂的一些物理性能进行了实验测量。在第二部分进行了数值研究，其中使用了上颌第二前磨牙。牙齿模型用复合树脂修复，并在用作基础材料的玻璃离子体上使用汞合金。所研究的应力分布是咀嚼力产生的应力与修复材料收缩和膨胀产生的应力的合力。所有计算均使用有限元方法进行，并使用FORTRAN 77编写程序。在牙齿的咬合边缘施加一个450 N的载荷，该载荷与纵轴成45度角。假设牙齿是各向同性、均匀、弹性和不对称的。绘制了整个牙齿结构的压应力、拉应力和剪应力分布。
