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Comparison of stress distribution in the temporomandibular joint during jaw closing before and after symphyseal distraction: a finite element study.

Abstract：

:The aim of this study was to predict stress modification in the temporomandibular joint (TMJ) after symphyseal distraction (SD). The study was performed using three-dimensional finite element analysis using a complete mastication model. Geometric data were obtained from MRI and CT scans of a healthy male patient and each component was meshed as various regions. The distraction was performed with a 10mm expansion after simulation of a surgical vertical osteotomy line on the model in the mandibular midline region. The geometry and mesh of the bone callus were constructed. The bone callus was modelled as a strengthened region characterized by a Young's modulus corresponding to consolidated bone to predict the long-term biomechanical effect of SD. Boundary conditions for jaw closing simulations were represented by different jaw muscle load directions. The von Mises stress distributions in both joint discs and condyles during closing conditions were analysed and compared before and after SD. Stress distribution was similar in discs and on condylar surfaces in the pre- and post-distraction models. The outcomes of this study suggest that anatomical changes in TMJ structures should not predispose to long-term tissue fatigue and demonstrate the absence of clinical permanent TMJ symptoms after SD.

journal_name

Int J Oral Maxillofac Surg

journal_title

International journal of oral and maxillofacial surgery

authors

Savoldelli C,Bouchard PO,Manière-Ezvan A,Bettega G,Tillier Y

doi

10.1016/j.ijom.2012.06.005

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1474-82

issue

12

eissn

0901-5027

issn

1399-0020

pii

S0901-5027(12)00270-6

journal_volume

41

pub_type

杂志文章

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