插销式数字化氧化锆桩冠插销形态合理性的三维有限元分析

›› 2020, Vol. 11 ›› Issue (4): 252-255.

插销式数字化氧化锆桩冠插销形态合理性的三维有限元分析

杨家雪¹,谢海峰¹,李林²,杨梅³,陈晨²

1. 南京医科大学
2. 南京医科大学附属口腔医院
3. 南京医科大学附属口腔医院义齿研制中心

收稿日期:2020-09-03 修回日期:2020-12-10 出版日期:2020-12-25 发布日期:2020-12-31
通讯作者: 陈晨 E-mail:ccchicy@njmu.edu.cn
基金资助:
国家自然科学基金;江苏省自然科学基金

Three dimensional finite element analysis on the rationality of split post shape of the split zirconia post-crown designed by digital technology

Received:2020-09-03 Revised:2020-12-10 Online:2020-12-25 Published:2020-12-31
Contact: Chen CHEN E-mail:ccchicy@njmu.edu.cn

摘要/Abstract

摘要： 目的：建立插销式数字化氧化锆桩冠中不同形态的插销桩三维有限元模型，并进行Von?Mises应力分析。方法：根据根桩（位于根管部分）与根管口所形成的斜坡角度（90°、120°、135°和160°）及冠桩（根管以上部分）与根桩间的直径差（0.5?mm、1?mm、1.5?mm和2?mm），采用SolidWorks?2016和ANSYS软件相结合，建立16种不同形态的插销桩三维有限元模型。分别模拟在垂直向600?N、水平向225?N加载情况下，分析不同形态插销桩的Von?Mises应力分布情况。结果：16组插销桩模型在不同方向载荷下的应力分布基本相似，最大应力主要分布于插销桩的冠桩与根桩的衔接处；在水平、垂直两种不同加载情况下，当斜坡呈90°即根管口未预备斜坡时，其在任意直径差下的Von?Mises应力最大值均明显高于有斜坡的钝角组；当斜坡呈120°时，其在任意直径差下的Von?Mises应力都比角度为135°和160°时更低；斜坡的角度大于90°时，插销桩冠桩和根桩衔接处所受应力随直径差的增大而减小，且冠桩与根桩直径差为2?mm时，不论二者衔接处呈现何种角度，在水平、垂直向载荷下的Von?Mises应力值都最小。结论：插销式氧化锆全瓷桩冠中插销桩斜坡角度呈90°～120°，且冠桩与根桩直径差越大越有利于插销桩的冠桩与根桩衔接处的应力分布。

关键词: 插销式桩冠, 氧化锆陶瓷, 角度, 直径差, 三维有限元分析

Abstract: Objective:?The three-dimensional finite element models with different shapes of the split post were established, and the von Mises stress distributions were analyzed. Methods:?According to the slope angle (90°, 120°, 135° and 160°) formed between the root post (the split post in root canal) and the root canal orifice and the diameter difference between the crown post (the part above the root canal) and the root post (0.5 mm, 1 mm, 1.5 mm and 2 mm), the three-dimensional finite element models of 16 different forms of split posts were established by SolidWorks 2016 and ANSYS software. The Von Mises stress distributions of different forms of split posts were analyzed under the conditions of 600 N vertical loading and 225 N horizontal loading, respectively. Results:?The stress distribution of 16 groups of split post models was basically similar under different directions of loading, and the maximum stress was mainly distributed at the junction of crown post and root post; when the root canal orifice was not prepared for slope, the maximum von Mises stress at any diameter difference was significantly higher than that of obtuse angle group with slope (120°, 135° and 160°) under horizontal and vertical loading; When the slope was 120°, the von Mises stress under any diameter difference was lower than that at 135°and 160°angles; When the angle of slope was greater than 90°, the stress at the joint of crown post and root post decreased with the increase of diameter difference, and when the diameter difference between crown post and root post was 2 mm, the von Mises stress value under horizontal and vertical loads was the minimum, regardless of the angle at the joint of crown post and root post. Conclusions:?The slope angle of the split post is recommended to be 90° to 120° in the split zirconia post-crown, and the larger the diameter difference between the crown post and the root post, the better the stress distribution at the joint between the crown post and the root post.

Key words: split post-crown, zirconia ceramic, angle, diameter difference, finite element analysis

杨家雪谢海峰李林杨梅陈晨. 插销式数字化氧化锆桩冠插销形态合理性的三维有限元分析[J]. 口腔生物医学, 2020, 11(4): 252-255.

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