中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (35): 6512-6516.doi: 10.3969/j.issn.1673-8225.2010.35.013

• 数字化骨科 digital orthopedics • 上一篇    下一篇

参数化人上颌中切牙桩冠修复三维有限元模型中桩核冠直径和长度变量的生物力学优化

高建勇1，汪大林1，孔  亮2，田  刚1   

  1. 1解放军第二军医大学长海医院口腔科，上海市 200433；2解放军第四军医大学口腔医院，陕西省西安市  710032
  • 出版日期:2010-08-27 发布日期:2010-08-27
  • 通讯作者: 汪大林，解放军第二军医大学长海医院口腔科，上海市 200433
  • 作者简介:高建勇★，男，1976年生，上海市人，汉族，2008年上海交通大学医学院毕业，硕士，主治医师，主要从事口腔临床修复研究。 yanshaowang@126.com

Biomechanical optimization of diameter and length of parameterization three-dimensional finite element model of human maxillary central incisor with post-and-core

Gao Jian-yong1, Wang Da-lin1, Kong Liang2, Tian Gang1   

  1. 1 Department of Stomatology, Changhai Hospital, Second Military Medical University, Shanghai  200433, China; 2 Hospital of Stomatology, Fourth Military M edical University, Xi’an  710032, Shaanxi Province, China
  • Online:2010-08-27 Published:2010-08-27
  • Contact: Wang Da-lin, Department of Stomatology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China
  • About author:Gao Jian-yong★, Master, Attending physician, Department of Stomatology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China yanshaowang@126.com

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379

被引次数

6

摘要：

背景：以往有关桩直径和长度的生物力学三维有限元研究中，多为直径或长度的单因素离散组合分析，不能准确反映桩直径和长度同时连续变化对牙根应力的影响。
目的：基于Ansys Workbench中DesignXplorer 优化设计平台，探讨动态连续的桩直径和长度变化对牙根应力的影响。
方法：建立参数化人上颌中切牙桩冠修复三维有限元模型，Ansys WOrkbench软件设定桩直径和长度的变化，其参数变量直径变化范围为1.0~4.1 mm，长度变化范围为3.0~8.0 mm，分析双变量直径和长度同时连续变化情况下，牙根牙本质平均主应力分布。同时进行直径和长度变量对的Max EQV Stress敏感度分析。
结果与结论：随着长度的增加，镍铬合金桩修复后根牙本质EQV应力峰值下降28.9%；碳纤维桩根牙本质EQV应力峰值下降13.1%。随着直径增加，镍铬合金桩根牙本质EQV应力峰值下降33.9%；碳纤维桩根牙本质EQV应力峰值下降9.6%。镍铬合金桩长度在5.16~8.00 mm范围内变化，碳纤维桩长度在4.75~8.00 mm范围变化时，镍铬合金桩直径在1.62~  2.02 mm范围变化时，碳纤维桩变量直径在1.68~2.20 mm范围变化时，根牙本质EQV应力峰值响应曲线率位于-1和1之间。提示增加桩的长度、直径有利于改善牙根牙本质应力分布，镍铬合金桩长度和直径的变化与纤维桩相比更易影响牙根应力大小；对于铸造镍铬合金桩而言，桩直径对根牙本质的EQV应力峰值的影响远远大于长度。碳纤维桩系统桩长度对根牙本质的EQV应力峰值的影响大于直径。从生物力学角度而言铸造桩参数优化选择范围：长度为5.16~8.00 mm，直径为1.62~2.02 mm；纤维桩参数优化选择范围：长度为4.75~8.00 mm，直径为1.68~2.20 mm。

关键词: 桩核冠, 有限元分析, 优化设计, 桩直径, 桩长度, 数字化医学

Abstract:

BACKGROUND: In the past 3D finite element analysis of post-and-core crown, length and diameter of post were almost analyzed by straggling and combinatorial method that could not precisely reflect their status of continuous variation.
OBJECTIVE: To determine the residual roots stress variation affected by continuous variation of length and diameter of post by Ansys Workbench-DesignXplorer.
METHODS: Parameterization 3-D finite element model of human maxillary central incisor with post-And-Core was created. The range of the post diameter (D) and length (L) were set from 1.0 mm to 4.1 mm and from 3.0 mm to 8.0 mm, respectively by Ansys Workbench.  Influence of the maximum Von Mises stresses in dental tissue by continuous variation of length and diameter of post and sensitivity to D and L were evaluated．
RESULTS AND CONCLUSION: With increasing L, EQV of nickel-chromium alloy post decreased 28.9%, and EQV of carbon fiber post decreased 13.1%; with increasing D, EQV of nickel-chromium alloy post decreased 33.9%, and EQV of carbon fiber post decreased 9.6%. When 5.16 < L < 8.00 and 1.62 < D < 2.02 (nickel-chromium alloy post), 4.75 < L < 8 and 1.68 < D < 2.2 (carbon fiber post), the response curve curvatures of maximum Von Mises stresses to L and D in dentin ranged from -1 to +1. The result has shown that the dentin stress of nickel-chromium alloy post is more sensitive to variation of length and diameter than that of carbon fiber post. diameter of nickel-chromium alloy post have more important influence than length, however, and length of carbon fiber post have more important influence than diameter. Biomechanical natures of different materials should be considered, and the suitable length of nickel-chromium alloy post is 5.16-8.00 mm, and the suitable diameter is 1.62-2.02 mm; the suitable length of carbon fiber post is 4.75-8.00 mm, and the suitable diameter is 1.68-2.20 mm.

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