Department of Pedodontics, Faculty of Dentistry, Ataturk University, Erzurum, Turkey.
Department of Hydraulic, Faculty of Engineering, Ataturk University, Erzurum, Turkey.
Eur J Paediatr Dent. 2014 Sep;15(3):317-22.
The purpose of this finite element analysis (FEA) study is to evaluate and compare the stress distributions at the primary molars and restorative materials according to the material used.
A total of 12 3D models of Class II cavities in primary molars plus one control model were analysed. Study design: Three-dimensional FEA was used to compare stress distribution on enamel, dentin and restoration surfaces of cavities.
Stresses occurring under occlusal forces were compared with the von Mises criterion.
The highest von Mises stress values at the enamel and restoration of restored tooth 84 were computed. On the basis of these results, all materials were ranked on enamel stress as: flowable composite resin (FCR)> compomer > resin modified glass ionomer cement (RMGIC) > giomer composite resin (GCR) > hybrid composite resin (HCR) > amalgam. Moreover, ranking of materials on restoration stress was FCR < compomer < RMGIC < GCR < amalgam < HCR.
A restorative material with appropriate elasticity module, able to balance stress concentrations, should be used to increase the survival rate of both the hard tissue of the tooth and the restoration material.
本有限元分析（FEA）研究旨在根据所使用的材料评估和比较乳磨牙的主要受力分布和修复材料。
分析了 12 个 II 类窝洞的三维模型，外加一个对照模型。研究设计：三维有限元分析用于比较窝洞表面釉质、牙本质和修复体的应力分布。
比较了咬合力下的应力与冯·米塞斯准则。
计算了修复后牙齿 84 的釉质和修复体上的最大冯·米塞斯应力值。基于这些结果，对釉质上的所有材料进行了排序：流动复合树脂（FCR）>复合体>树脂改性玻璃离子水门汀（RMGIC）>玻璃离子复合树脂（GCR）>混合复合树脂（HCR）>汞合金。此外，修复体上的材料排序为：FCR<RMGIC<GCR<汞合金<复合体<HCR。
应使用弹性模量适当、能够平衡应力集中的修复材料，以提高牙齿硬组织和修复材料的存活率。
