下颌前磨牙中椭圆形和圆形纤维桩的应力分布：三维有限元分析。
Stress distribution of oval and circular fiber posts in amandibular premolar: a three-dimensional finite element analysis.
机构信息
Department of Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
Department Prosthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
出版信息
J Adv Prosthodont. 2013 Nov;5(4):434-9. doi: 10.4047/jap.2013.5.4.434. Epub 2013 Nov 28.
PURPOSE
The aim of the present study was to evaluate the effects of posts with different morphologies on stress distribution in an endodontically treated mandibular premolar by using finite element models (FEMs).
MATERIALS AND METHODS
A mandibular premolar was modeled using the ANSYS software program. Two models were created to represent circular and oval fiber posts in this tooth model. An oblique force of 300 N was applied at an angle of 45° to the occlusal plane and oriented toward the buccal side. von Mises stress was measured in three regions each for oval and circular fiber posts.
RESULTS
FEM analysis showed that the von Mises stress of the circular fiber post (426.81 MPa) was greater than that of the oval fiber post (346.34 MPa). The maximum distribution of von Mises stress was in the luting agent in both groups. Additionally, von Mises stresses accumulated in the coronal third of root dentin, close to the post space in both groups.
CONCLUSION
Oval fiber posts are preferable to circular fiber posts in oval-shaped canals given the stress distribution at the post-dentin interface.
目的
本研究旨在通过有限元模型（FEM）评估不同形态的桩对根管治疗下颌前磨牙内应力分布的影响。
材料和方法
使用 ANSYS 软件程序对下颌前磨牙进行建模。在该牙模型中创建了两个模型，分别代表圆形和椭圆形纤维桩。以 45°角向颊侧施加 300 N 的斜向力，方向朝向咬合面。在椭圆形和圆形纤维桩的每个区域测量 von Mises 应力。
结果
有限元分析表明，圆形纤维桩的 von Mises 应力（426.81 MPa）大于椭圆形纤维桩的 von Mises 应力（346.34 MPa）。两组的最大 von Mises 应力分布均在黏结剂中。此外，两组的 von Mises 应力都在根管牙本质的冠三分之一处累积，靠近桩腔。
结论
鉴于桩-牙本质界面的应力分布，在椭圆形根管中，椭圆形纤维桩优于圆形纤维桩。
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