Kumar Pradeep, Rao R Nageswar
Department of Conservative Dentistry and Endodontics, Yenepoya Dental College, Mangalore, Karnataka, India.
Department of Conservative Dentistry and Endodontics, Shri Dharmasthala Manjunatheshwara College of Dental Sciences, Dharwad, Karnataka, India.
J Conserv Dent. 2015 Mar-Apr;18(2):100-4. doi: 10.4103/0972-0707.153061.
To compare stress distribution in a tooth restored with metal and fiber posts of varying diameters (1.2 and 1.4 mm) by means of three-dimensional finite element analysis (3D-FEA).
Four 3D-FEA models were constructed: (1) fiber post (1.2 and 1.4 mm) and (2) metal post (1.2 and 1.4 mm). The material properties were assigned and a force of 100 N was applied at 45° angle to the longitudinal axis of the tooth onto the palatal surface incisal to the cingulum. Analysis was run and stress distribution pattern was studied.
Maximum stresses in the radicular tooth structure for fiber post were higher than that for metal post. In the former models, stresses in the tooth structure were slightly reduced with increase in fiber post diameter.
To reduce stress in the remaining radicular tooth structure, it is better to use a fiber post of a large diameter.
通过三维有限元分析（3D-FEA）比较使用不同直径（1.2毫米和1.4毫米）的金属桩和纤维桩修复牙齿时的应力分布情况。
构建四个三维有限元分析模型：（1）纤维桩（1.2毫米和1.4毫米）和（2）金属桩（1.2毫米和1.4毫米）。设定材料属性，并在与牙齿纵轴呈45°角的方向上，向切牙舌隆突上方的腭面施加100牛的力。进行分析并研究应力分布模式。
纤维桩修复的牙根牙齿结构中的最大应力高于金属桩修复的情况。在前者模型中，随着纤维桩直径的增加，牙齿结构中的应力略有降低。
为降低剩余牙根牙齿结构中的应力，最好使用大直径的纤维桩。
