不同直径种植体与天然牙联合支持固定桥的应力分析

doi:10.3969/j.issn.1005-4979.2012.02.009

《口腔颌面外科杂志》 ›› 2012, Vol. 22 ›› Issue (2): 105-109. doi: 10.3969/j.issn.1005-4979.2012.02.009

不同直径种植体与天然牙联合支持固定桥的应力分析

李振¹，聂文忠²，黄远亮³

1.南京大学医学院附属口腔医院种植科，江苏南京　210008；
2.上海应用技术学院机械工程学院，上海　200235；3.同济大学附属东方医院口腔科，上海　200120

出版日期:2012-04-28 发布日期:2012-06-27
通讯作者: 黄远亮，教授. E-mail: ylhuang0115@yahoo.com.cn
作者简介:李振（1980—），男，安徽人，住院医师，硕士.

Influence of Implants Diameter on Bone Stress Distribution of Tooth-implant Supported Fixed Partial Denture

LI Zhen¹，NIE Wen-zhong²，HUANG Yuan-liang³

1.Department of Implantology, Hospital of Stomatology, School of Medicine, Nanjing University,
Nanjing　210008, Jiangsu Province;2.School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai　200235; 3.Department of Stomatology, Oriental Hospital, Tongji University, Shanghai　200120, China

Online:2012-04-28 Published:2012-06-27

摘要/Abstract

摘要： 目的： 通过三维有限元方法研究种植体直径对天然牙种植体联合固定桥周围骨组织应力的影响。方法： CT扫描获得志愿者DICOM数据，通过Mimics软件、Imageware逆向工程软件及ANSYS软件处理，先建立左侧下颌第二前磨牙和第二磨牙支持的天然牙固定桥三维有限元模型，用不同直径种植体替换下颌第二磨牙得到一系列种植体?鄄天然牙联合支持式固定桥的三维有限元模型。分别在垂直向和斜向45°集中加载下，对比分析天然牙及种植体周围的应力分布情况。结果： 相同加载条件下，不同模型的第二前磨牙（天然牙）颈部应力无明显区别。对联合支持式固定桥，当种植体直径由3.5 mm增加为4.3 mm时，种植体颈部和基台的应力明显降低（近1/2）；随种植体直径增加，2处应力也继续降低，但降低的幅度明显放缓。结论： 随着种植体直径的增大，种植体颈缘处骨组织及基台的von Mises应力逐渐减小，但对天然牙周围的应力影响较小。斜向载荷时，天然牙、种植体周围骨组织及基台受到的von Mises应力显著增大，更易导致固定桥修复的失败。

关键词: 三维有限元；联合支持式固定桥；种植体；应力

Abstract: Objective: The aim of this study was to analyze stress distribution in the bone of tooth-implant supported fixed partial denture (FPD) with different implant diameters by using a three-dimensional finite element method. Methods: A volunteer was chosen to have a CT scan, and then the DICOM data was processed by the softwares of Mimics, Imageware and ANSYS respectively. The three-dimensional finite element mode of fixed partial denture, which was supported by the second premolar and the second molar or an implant of different diameters(3.5, 4.3, 5.0, 6.0 mm), was constructed in the left mandible. The values of von Mises stress of bone were obtained, when FPD was loaded with vertical or 45° buccolingual force of 200 N. Results: The values of von Mises stress on bone around tooth/implant and abutment were obtained when the fixed partial dentures were loaded with vertical or 45° buccal-lingual oblique force of 200 N respectively. The values of von Mises stress on bone around the second premolar neck varied indistinctively when the fixed partial dentures were loaded with the same force. In different diameter implant-tooth supported fixed partial denture, the von Mises stress of implant neck and abutment decreased obviously when implant diameter increased from 3.5 mm to 4.3 mm, but showed a slow downtrend as the implant diameter continue increasing. Conclusion: With the increase of implant diameter, the values of von Mises stress on bone around implants and abutment decreased, but that of the nature teeth changed little. Under oblique load, the values of von Mises stress on bone around tooth/implant and abutment increased significantly, which might contribute to the failure of FPD.

Key words: finite element method, fixed partial denture, implant, stress

中图分类号:

R782.13

李　振，聂文忠，黄远亮. 不同直径种植体与天然牙联合支持固定桥的应力分析[J]. 《口腔颌面外科杂志》, 2012, 22(2): 105-109.

LI Zhen，NIE Wen-zhong，HUANG Yuan-liang. Influence of Implants Diameter on Bone Stress Distribution of Tooth-implant Supported Fixed Partial Denture[J]. 《Journal of Oral and Maxillofacial Surgery》, 2012, 22(2): 105-109.

https://journal06.magtech.org.cn/Jweb_joms/CN/Y2012/V22/I2/105

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