不同桩核系统修复上颌第一磨牙的有限元分析

上海口腔医学 ›› 2013, Vol. 22 ›› Issue (6): 607-612.

不同桩核系统修复上颌第一磨牙的有限元分析

赵莉¹，李丽君²，赵克¹*，邓旭亮³*

(1.中山大学光华口腔医学院?附属口腔医院口腔修复科，广东广州 510055；2.南方医科大学附属衡阳医院?衡阳市中心医院口腔科，湖南衡阳 421001；3.北京大学口腔医院特诊科，北京 100081)

收稿日期:2013-03-29 修回日期:2013-05-12 出版日期:2013-04-12 发布日期:2013-04-12
通讯作者: 赵克，E-mail: zhaoke@mail.sysu.edu.cn；邓旭亮，E-mail: dengxuliang@vip.sina.com。*并列通信作者
作者简介:赵莉(1987-)，女，在读硕士研究生，E-mail: zhaoli3@mail2.sysu.edu.cn
基金资助:
国家自然科学基金(81271175)；国家科技支撑计划课题(2012BAI07B01)

Finite element analysis of first maxillary molars restored with different post and core materials

ZHAO Li¹, LI Li-jun², ZHAO Ke¹*, DENG Xu-liang³*

1.Department of Prosthodontics, Guanghua School of Stomatology, Sun Yat-sen University. Guangzhou 510055, Guangdong Province; 2.Department of Stomatology, Central Hospital of Hengyang, Southern Medical University. Hengyang 421001, Hunan Province; 3.Special Dental Care Clinic, School of Stomatology, Peking University. Beijing 100081, China

Received:2013-03-29 Revised:2013-05-12 Online:2013-04-12 Published:2013-04-12
Supported by:
Supported by Natural Science Foundation of China (81271175) and National Science and Technology Supporting Plan (2012BAI07B01).

摘要/Abstract

摘要： 目的：利用有限元法分析不同数目桩、不同材料桩核及不同载荷对磨牙桩核冠修复后剩余牙体组织的应力大小及其分布的影响。方法：采用CT扫描上颌第一磨牙，有限元法建立不同数目桩及不同材料桩核修复上颌第一磨牙后的模型，载荷1以480 N总载荷垂直加载模拟正中咬合，载荷2以200 N总载荷与牙长轴成45°斜向加载模拟咀嚼，采用MSC.Marc软件分析剩余牙体组织的Von Mises应力大小及其分布。结果：随桩核材料弹性模量的增加，牙颈部Von Mises应力峰值减小，牙根内表面的应力值增加；铸造桩组腭根和远中颊根桩修复时，桩周牙本质的应力峰值小于腭根桩修复及腭根和近远中颊根桩修复；载荷2条件下，牙颈部的应力峰值较载荷1条件下的应力峰值小，而牙根内表面的应力峰值较大。结论：桩的数目、桩核材料及载荷大小与方向均对磨牙桩核冠修复后剩余牙本质的应力大小和分布有影响。

关键词: 桩数目, 上颌第一磨牙, Von Mises 应力, 有限元分析

Abstract: PURPOSE: To analyze the stress magnitude and distribution of residual dentin in maxillary first molar restored with post and crown using three-dimension finite element methods. METHODS: An intact maxillary first molar was scanned using a 3DX multi-image micro-CT. Three-dimensional finite element models simulated an endodontically treated first maxillary molar restored with post and crown, which were varied in different number and material of post. A load of 480 N, simulating intercuspal occlusion, was applied vertically to the occlusal surface；and a load of 240 N simulating mastication was applied to the occlusal surface with a 45° angle to the long axis of the tooth. Von Mises stresses were calculated by MSC.Marc software. RESULTS: The maximum stresses among the post in the radicular portion increased as elastic modulus of the material increased. The stress values of remaining dentin observed in two-post group were lower than those in one post group and three-post group for cast metal post systems. In the test simulating mastication, the peak value of Von Mises stress was higher on remaining dentin among the post in the radicular portion and lower on the outer surface of residual tooth tissue than that in the test simulating intercuspal occlusion. CONCLUSIONS: The number, material of post and occlusal loading have influence on magnitude and distributionn of stress.

Key words: Post quantity, First maxillary molar, Von Mises stress, Finite element analysis

中图分类号:

R783.1

赵莉, 李丽君, 赵克*, 邓旭亮*. 不同桩核系统修复上颌第一磨牙的有限元分析[J]. 上海口腔医学, 2013, 22(6): 607-612.

ZHAO Li, LI Li-jun, ZHAO Ke*, DENG Xu-liang*. Finite element analysis of first maxillary molars restored with different post and core materials[J]. Shanghai Journal of Stomatology, 2013, 22(6): 607-612.

参考文献

[1] Dietschi D, Duc O, Krejci I, et al. Biomechanical considerations for the restoration of endodontically treated teeth: a systematic review of the literature—Part 1. Composition and micro- and macrostructure alterations[J]. Quintessence Int, 2007,38(9):733-743.
[2] Dietschi D, Duc O, Krejci I, et al. Biomechanical considerations for the restoration of endodontically treated teeth: a systematic review of the literature, Part Ⅱ (Evaluation of fatigue behavior, interfaces, and in vivo studies)[J]. Quintessence Int, 2008, 39(2): 117-129.
[3] Asmussen E, Peutzfeldt A, Sahafi A. Finite element analysis of stresses in endodontically treated, dowel-restored teeth[J]. J Prosthet Dent, 2005, 94(4): 321-329.
[4] Nakamura T, Ohyama T, Waki T, et al. Stress analysis of endodontically treated anterior teeth restored with different types of post material[J]. Dent Mater J, 2006, 25(1): 145-150.
[5] de Castro Albuquerque R, Polleto LT, Fontana RH, et al. Stress analysis of an upper central incisor restored with different posts[J]. J Oral Rehabil, 2003, 30(9): 936-943.
[6] 翁维民, 朱梓园, 张保卫, 等. 桩核冠受力时的应力分析[J]. 上海口腔医学, 2005, 14(6): 613-616.
[7] 刘则玉, 李彦, 凌均棨, 等. 铸造桩核修复重度缺损上颌第一磨牙三维有限元模型的建立[J]. 中华口腔医学研究杂志(电子版), 2008, 2(2): 141-146.
[8] 张敬阳, 庞光明, 陈建钢. 上颌第一磨牙分体桩核冠的三维有限元分析[J]. 口腔医学研究, 2012, 28(3): 237-239, 243.
[9] Dejak B, Mlotkowski A, Romanowicz M, et al. Finite element analysis of stresses in molars during clenching and mastication[J]. J Prosthet Dent, 2003, 90(6): 591-597.
[10] Imanishi A, Nakamura T, Ohyama T, et al. 3-D finite element analysis of all-ceramic posterior crowns[J]. J Oral Rehabil, 2003, 30(8): 818-822.
[11] 王惠芸. 我国人牙的测量和统计[J]. 中华口腔科杂志,1959,3(2):149-150.
[12] 陈一怀, 王惠芸, 马轩祥, 等. 正常牙尖交错位咬合接触的计算机图像分析[J]. 实用口腔医学杂志, 2000, 16(5): 398-401.
[13] Okada D, Miura H, Suzuki C, et al. Stress distribution in roots restored with different types of post systems with composite resin[J]. Dent Mater J, 2008, 27(4): 605-611.
[14] Pegoretti A, Fambri L, Zappini G, et al. Finite element analysis of a glass fibre reinforced composite endodontic post[J]. Biomaterials, 2002, 23(13): 2667-2682.
[15] Plotino G, Grande NM, Bedini R, et al. Flexural properties of endodontic posts and human root dentin[J]. Dent Mater,2007,23(9): 1129-1135.
[16] Fu G, Deng F, Wang L, et al. The three-dimension finite element analysis of stress in posterior tooth residual root restored with postcore crown[J]. Dent Traumatol, 2010, 26(1): 64-69.
[17] Eskita[?]　[s]cio[ǐ]　[g]lu G, Belli S, Kalkan M. Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis)[J]. J Endod, 2002, 28(9): 629-633.
[18] Asmussen E, Peutzfeldt A, Sahafi A. Finite element analysis of stresses in endodontically treated, dowel-restored teeth[J]. J Prosthet Dent, 2005, 94(4): 321-329.