| 3045 Three-dimensional finite element analysis of TMJ stress in normal and severe attrition occlusion | ||
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M. ZHANG, Stomatological College, Fourth Military Medical University, Xian, China, J. WANG, Stomatological College, Fourth Military Medical University, Xi'an, China, and M. WANG, Stomatological College, Fourth Military Medical University, xian, China Objectives: To investigate the difference of TMJ load between the normal and severe attrition occlusion and further to elucidate the effect of occlusal surface formation on stress distribution of temporomandibular joint (TMJ). Methods: Two set of epoxy models presenting normal and severe attrition occlusion were produced to observe both directions and magnitude of main stress around apex in mandible by photoelastic instrument. CT scanned transverse section and manual slice section was adopted for establishing three-dimensional finite element model of TMJ. The whole model was loaded with the occlusal vector of two occlusal types derived from photoelastic analysis to simulate the stress enviroment of TMJ in normal and severe attrition occlusal pattern. Super-SAP finite element software was adopted in the study to analysis values and characteristics of stress in different part of TMJ. Results: There were some common features of TMJ stress in two kinds of occlusion, which showed that anterior slope of condyle, anterior part of condylar cartilage and middle band of articular disc were pressed continuously while the posterior slope of condyle ,posterior part of condylar cartilage and posterior band of disc were pulled all the way. Moreover, there were still many differences between the TMJ stress of two occlusal types. In normal occlusion, the stress in normal TMJ was relatively low while its level improved significantly in severe attrition occlusion, especially in the middle part of TMJ. Besides, the most pressed area of TMJ shifted from the cartilage to the middle part of the articular disc and the most pulled area of TMJ shifted from mesial part to the middle part of the condyle. Conclusions: The values and distribution feature in TMJ of severe attrition occlusion varied greatly to that of the normal. Consequently, the reconstruction of TMJ was probably involved.Supported by NSFC grant number 39370195. | ||
| Seq #275 - TMJ - Structure and Function II 3:45 PM-5:00 PM, Friday, 8 March 2002 San Diego Convention Center Exhibit Hall C | ||
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