Establishing the Finite Element Model of Mid-Palatal Suture Fracture by Microimplant-Assisted Palatal Expansion
10.16156/j.1004-7220.2020.04.08
- VernacularTitle:种植钉辅助扩弓后腭中缝断裂的有限元模型建立
- Author:
Siren WANG
1
;
Junjie CHEN
1
;
Yanhao CHU
1
;
Fan LI
2
;
Yanqin LU
1
Author Information
1. Department of Orthodontics, Xiangya Stomatological Hospital, Central South University
2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University
- Publication Type:Journal Article
- Keywords:
microimplant-assisted palatal expansion;
mid-palatal suture;
fracture mechanics
- From:
Journal of Medical Biomechanics
2020;35(4):E443-E316
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze mechanical characteristics for stress accumulation of the maxillary complex during expansion until complete fracture of the mid-palatal suture by using the three-dimensional (3D) finite element method, and verify validity of the model. Methods The finite element maxillary complex model containing the microimplants was established. The yield strength of the mid-palatal suture was set, and the transverse displacement of 0.25 mm was loaded every 5 ms as the load until the suture was completely fractured. The CT images of one clinical patient before and after expansion were compared and verified. Results During 0-17 ms, the stress was mainly concentrated around the microimplants, the middle of the mid-palatal suture and the zygomatico-maxillary sutures. During 18-60 ms, cracks began to occur in the mid-palatal suture, and expanded forward and backward. During 61-71 ms, the rupture path was followed by posterior part of the mid, palatal suture-the front part and the back part. Conclusions The 3D finite element model of microimplant-assisted expansion based on fracture mechanics was effective and the calculated fracture process result were more consistent with clinical practice. The research findings provide the mechanical reference model for more effective research on microimplant-assisted palatal expansion in the future.
