*Fares Raafat Elsayed Mohamed Moustafa1, Kenji Fueki1, Akira Nishiyama2, Hiroyuki Ishiyama1
(1. Department of Masticatory Function and Health Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 2. Department of General Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)