2012 Fiscal Year Final Research Report

Modeling of Multibody-dynamics of Superior Members under Occlusion

Research Project

Project/Area Number	23656087
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Materials/Mechanics of materials
Research Institution	Osaka University
Principal Investigator	SHIBUTANI Yoji 大阪大学, 大学院・工学研究科, 教授 (70206150)
Research Collaborator	HIHARA Keita 大阪大学, 大学院・博士前期課程, 学生
Project Period (FY)	2011 – 2012
Keywords	歯科咬合 / 表面筋電位計測 / 不正咬合 / 増分型筋構成式 / はりモデル / 有限要素解析 / 筋-骨格系 / 不定愁訴
Research Abstract	Surface muscle potentials for occlusal activities in dentistrywere measured by the muscle potential instrument. Four kinds of muscles were taken upfor measurement in the present work, which are the right-and-left masseter and cowlmuscles. The higher activation was observed in the work-side and these reference datawere applied to development of an incremental constitutive law of muscle employed in afinite element scheme. For ordinal occlusal activities, this law should be sufficientto describe the time-dependent mechanics without any inertia, and the results newlysuggest that natural length of muscle was changed to a cyclic loading and then thehysteresis loop becomes stationary