国际口腔医学杂志 ›› 2019, Vol. 46 ›› Issue (5): 526-531.doi: 10.7518/gjkq.2019087

• 论著 • 上一篇    下一篇

钴铬合金和聚醚醚酮用于可摘局部义齿支架的三维有限元分析

陈昕,毛渤淳,鲁雨晴,董博,朱卓立,岳莉,于海洋()   

  1. 口腔疾病研究国家重点实验室 国家口腔疾病临床医学研究中心 四川大学华西口腔医院修复Ⅱ科 成都 610041
  • 收稿日期:2019-01-22 修回日期:2019-06-08 出版日期:2019-09-01 发布日期:2019-09-10
  • 通讯作者: 于海洋
  • 作者简介:陈昕,硕士,Email:chenxin. scu@foxmail.com
  • 基金资助:
    国家自然科学基金(81771113)

Research on mechanical property of Co-Cr alloy and polyetheretherketone frameworks of removable partial denture: a three-dimensional finite element analysis

Chen Xin,Mao Bochun,Lu Yuqing,Dong Bo,Zhu Zhuoli,Yue Li,Yu Haiyang()   

  1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics II, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2019-01-22 Revised:2019-06-08 Online:2019-09-01 Published:2019-09-10
  • Contact: Haiyang Yu
  • Supported by:
    This study was supported by National Natural Science Foundation of China(81771113)

摘要:

目的 对比钴铬合金和聚醚醚酮(PEEK)制作的可摘局部义齿支架,对患者基牙、黏膜形变及支架受力的影响。方法 选择肯氏Ⅰ类缺失患者1例,通过锥形束计算机断层(CBCT)扫描、口内石膏模型扫描,EXO-CAD软件设计2种可摘局部义齿,Mimics、Geo-magic studio与Abaqus/CAE软件处理模型进行三维有限元分析。分别对支架加载钴铬合金与聚醚醚酮材料。观察基牙、黏膜形变及支架受力的情况。结果 PEEK支架的基牙最大形变量小于钴铬合金,且均分布于牙槽窝;黏膜最大位移量大于钴铬合金,且均分布于缺牙区远端;支架受力小于钴铬合金,且力的分布更加均匀。结论 对于牙列远中游离缺失的患者,PEEK制作的支架具有一定的保护基牙和牙周膜的作用,并且支架内部的应力更小、更均匀;但其对缺牙区黏膜和牙槽骨的压力更大,不适合黏膜和骨质较差的患者。

关键词: 聚醚醚酮, 钴铬合金, 可摘局部义齿, 三维有限元分析

Abstract:

Objective To compare the different displacement of cobalt-chromium (Co-Cr) alloy and polyetheretherketone (PEEK) frameworks of removable partial denture (RPD) on a patient’s abutment teeth, mucosa and the stress distribution on the frameworks. Methods A patient with Kennedy Class Ⅰ was chosen. The RPD in vivo model with two different framework materials was built by the scanned data of the cone beam computed tomography (CBCT) and master models, which were processed by Mimics, Geo- magic studio, EXO-CAD and Abaqus/CAE. The displacement and stress distribution of the models were investigated. Results The maximum displacement of abutment teeth and the stress on the PEEK framework were smaller than that of Co-Cr alloy. The maximum mucosa displacement of the PEEK framework was larger than that of Co-Cr alloy, with an even distribution. Conclusion For patients with distal-extension absence defect, the PEEK framework can protect the abutment teeth and periodontal ligament. Stress is even and relatively small inside the framework. However, the PEEK framework will increase the stress on the mucosa of the edentulous ridge, which is harmful for patients with bad mucosa and bone loss condition.

Key words: polyetheretherketone, Co-Cr alloy, removable partial denture, three-dimensional finite element analysis

中图分类号: 

  • R783.1

图 1

有限元模型构建过程"

图 2

可摘局部义齿支架设计 支架1:下颌左侧尖牙设计A型卡环,下颌右侧前磨牙设计联合卡环;支架2:下颌左侧尖牙设计RPT卡环组,下颌右侧第一前磨牙设计RPL卡环组,下颌右侧第二前磨牙设计A型卡环。"

表 1

网格化后各模型节点数与单元格数"

模型 节点数 单元格数
颌骨 21 089 96 388
黏膜 107 848 522 017
余留牙 17 784 83 941
牙周膜 1 786 1 825
支架 支架1 62 049 243 121
支架2 60 569 237 101
基托 支架1基托 46 312 193 128
支架2基托 45 577 190 160
人工牙 支架1人工牙 31 521 140 673
支架2人工牙 37 252 167 984

表 2

各模型材料的力学参数"

材料 弹性模量/MPa 泊松比
黏膜 3.45 0.45
基托 2 200 0.31
骨松质 1 370 0.30
骨密质 13 700 0.30
牙周膜 非线性(见下文所述) 0.45
天然牙(牙本质) 18 600 0.30
人工牙 1 960 0.30
钴铬合金 235 000 0.33
PEEK 4 100 0.40

图 3

基牙位移、黏膜位移及支架受力情况 A~D:基牙位移;E~H:黏膜位移;I~L:支架受力。A、E、I:支架1(钴铬合金);B、F、J:支架1(PEEK);C、G、K:支架2(钴铬合金);D、H、L:支架2(PEEK)。"

表 3

各模型加载后位移及受力结果"

测量项目 支架1 支架2
钴铬合金 PEEK 钴铬合金 PEEK
基牙位移/μm 179.7 163.0 128.0 106.1
黏膜位移/mm 0.400 6 0.631 6 0.427 2 0.643 0
支架受力/MPa 446.2 92.4 388.8 72.8
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