Int J Stomatol

Int J Stomatol ›› 2019, Vol. 46 ›› Issue (5): 526-531.doi: 10.7518/gjkq.2019087

• Original Articles • Previous Articles     Next Articles

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 E-mail:yhyang6812@foxmail.com
  • Supported by:
    This study was supported by National Natural Science Foundation of China(81771113)

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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

CLC Number: 

  • R783.1

TrendMD: 

Fig 1

Finite element model construction process"

Fig 2

Design of removable partial denture framework"

Tab 1

Number of nodes and cells after meshing"

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

Tab 2

Mechanical parameters"

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

Fig 3

Abutment displacement, mucosal displacement and the stress of framework"

Tab 3

Displacement and stress after loading"

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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