Reconstruction of Segmental Mandibular Defects Restored by Prosthesis with Support and Porous Structure: A Biomechanical Study
10.16156/j.1004-7220.2021.05.18
- VernacularTitle:具有多孔和支撑结构的修复体重建下颌骨节段性缺损的生物力学研究
- Author:
Fang GUO
1
;
Shuo HUANG
1
;
Ning LIU
1
;
Yang XUE
2
;
Min HU
3
;
Changkui LIU
1
Author Information
1. College of Stomatology, Xi’an Medical University
2. College of Stomatology, the Air Force Military Medical University
3. Department of Oral and Maxillofacial Surgery, General Hospital of PLA
- Publication Type:Journal Article
- Keywords:
mandibular defects;
restoration reconstruction;
porous structure, finite element analysis;
mechanical properties
- From:
Journal of Medical Biomechanics
2021;36(5):E776-E782
- CountryChina
- Language:Chinese
-
Abstract:
Objective To design a personalized titanium mandibular prosthesis with porous and support structure, and analyze its stress distribution characteristics through finite element analysis, so as to evaluate clinical value and prospect of the prosthesis. Methods The fourth mandibular premolar and molar from the right mandible of Beagle dogs were removed. The spiral CT was taken after three-month healing, and the three-dimensional (3D) model of the mandible was established. Resection of 3 cm mandible with simulated surgical procedure and reconstruction with personalized restoration were conducted. The prosthesis consisted of abutment, pillar, solid unit, porous unit and retention unit. A personalized titanium mandibular prosthesis finite element model A was established, to analyze the prosthesis stress under loading, and further study was proceeded when the maximum stress of each part constituting the prosthesis was smaller than yield strength of its material. The finite element model B with the assembly of the prosthesis, mandible and screw was constructed and loaded with the mastication force, and the stress, strain and displacement distributions of the mandible were recorded. Results When the abutment was under 100 N vertical loading, the peak stress of the prosthesis with solid structure and porous structure was 147.03 and 75.36 MPa, respectively, which was smaller than yield strength of its material; the peak stress of the cortical bone and cancellous bone was 53.713, 4.216 7 MPa, and the strain was 3.753 6, 3.562 5, respectively; the maximum displacement of the restoration was 338.3 μm. ConclusionsTaking the canine mandible as an example, the personalized prosthesis with porous and support structure shows the uniform stress distribution and good mechanical properties through finite element analysis. The results provide a new method for the design of prosthesis for repairing mandibular defects.
