A three-dimensional(3-D)finite element study on the influence of reaction force when protraction direction magnifies clockwise
LEI Yin-tao
WANG Xu-xia
DONG Rui
ZHAO Shu-ya
CHEN Yun
ZHANG Jun
Abstract：Objective To offer a scientific basis for treating ClassⅢmalocclusion more well,and avoid injuring TMJ,a three-dimensional finite element model(FEM)of craniomaxillofacial complex was used to analyse the influence of the reactive force on TMJ when protraction direction magnified clockwise. Methods A healthy young male volunteer was selected;establish a complete three-dimensional(3-D)finite element model,which included TMJ;imitate the force pat-tern of maxillary protraction;exert a given force on chin;change the direction clockwise;the stress distribution and dis-placement on jaw and TMJ were analysed. Results Stress distribution:the biggest stress points appeared in the loading position chin after loading nodal force from different angle. The stess in the contact region,such as the glenoid fossa,con-dylar head and neck,was also relatively concentrated. Under the action of different angle,the maxilla and mandible both produced contact stress. Displacement:in a certain angle on the nodal force,the model produced tiny displacement change,the largest position displacement in loading part. Conclusion (1)Protraction appliance does produce reactive force on mandible and TMJ when making maxilla forward,so we need to consider both the two aspects;(2)The tradition-al way of boosting does not seem to be the best choice,and from the two aspects of action and reac-tion,40°is superior to 37°.
Keywords：protractionprotraction directionreac-tive forcetemporomandibular jointthree-dimen-sional(3-D)finite element
Publication Date：2013-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 467-472 )