下颌第一磨牙分根后单冠与联冠修复的有限元分析

上海口腔医学 ›› 2013, Vol. 22 ›› Issue (4): 393-398.

下颌第一磨牙分根后单冠与联冠修复的有限元分析

王桃，李可，邱晓霞，周琳，莫三心

(郑州大学第四附属医院口腔修复科，河南郑州 450002)

收稿日期:2013-01-18 修回日期:2013-03-22 出版日期:2013-08-10 发布日期:2013-08-10
通讯作者: 莫三心，E-mail:bohuishun12@163.com
作者简介:王桃(1970-)，女，硕士，副主任医师，E-mail:zzwangtao2005@sina.com
基金资助:
河南省教育厅科学技术研究重点项目(13A320640)

Three-dimensional finite element stress analysis of mandibular first molar with single and combined crowns after separation prosthodontic therapy

WANG Tao, LI Ke, QIU Xiao-xia, ZHOU Lin, MO San-xin

Department of Prosthodontics, College of Stomatology, The Fourth Affiliated Hospital of Zhengzhou University. Zhengzhou 450052, Henan Province, China

Received:2013-01-18 Revised:2013-03-22 Online:2013-08-10 Published:2013-08-10
Supported by:
Supported by Key Research Project of Science and Technology from the Bureau of Education of Henan Province (13A320640).

摘要/Abstract

摘要： 目的：研究下颌第一磨牙分根后2种修复方式对磨牙应力分布的影响。方法：利用锥形束CT(CBCT)扫描和Mimics、Geomagic、UG处理图像，建立下颌第一磨牙分根术后单冠和联冠修复的三维有限元模型。分别进行垂直和斜向加载，计算正常下颌第一磨牙及2种修复方式下牙体和牙周组织的应力。结果：垂直载荷时，2种修复模型与正常磨牙牙体、牙周应力分布相似；牙体应力极值和牙周膜最大主应力值均增加，单冠模型增幅较大。斜向载荷时，联冠模型与正常磨牙牙体、牙周应力分布相似，单冠模型远中根及牙周膜颊侧根下半部应力集中区增大；牙体应力极值和牙周膜最大主应力值均增加，单冠模型增幅较大。结论：下颌第一磨牙分根术后选择联冠修复更为合理。

关键词: 分根术, 三维有限元, 单冠, 联冠, 下颌第一磨牙

Abstract: PURPOSE: To evaluate the influence of two kinds of fixed prosthesis on the stress of the mandibular first molar with separation prosthodontic therapy. METHODS: A 3-D finite element model of the mandibular first molar was established with single and combined crowns and their supporting tissues by means of cone-beam CT (CBCT) scanning technology and software Mimics, Geomagic, UG of image processing program. Under dispersed vertical load and dispersed oblique load, the stresses of dental tissues and periodontium were obtained and analysed. RESULTS: When dispersed vertical load was applied, the dental and periodontal stress distribution of two models were similar to the normal. The dental stress value and maximum tensile stress of the periodontal membrane increased and changed greatly in the single crown. When dispersed oblique load was applied, the model of combined crown was similar to the normal. The stress concentrated area expanded in the distal root of the single crown model and the buccal bottom half of the periodontium. The dental stress value and maximum tensile stress of the periodontal membrane increased and changed greatly in the single crown. CONCLUSIONS: The combined crown is a better choice for restoration of mandibular first molar after separation prosthodontic therapy.

Key words: Separating root, Three-dimensional finite element method, Single crown, Combined crowns, Mandibular first molar

中图分类号:

R783.4

王桃, 李可, 邱晓霞, 周琳, 莫三心. 下颌第一磨牙分根后单冠与联冠修复的有限元分析[J]. 上海口腔医学, 2013, 22(4): 393-398.

WANG Tao, LI Ke, QIU Xiao-xia, ZHOU Lin, MO San-xin. Three-dimensional finite element stress analysis of mandibular first molar with single and combined crowns after separation prosthodontic therapy[J]. Shanghai Journal of Stomatology, 2013, 22(4): 393-398.

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