*Siti Mariam Ab Ghani1, Mas Linda Osman1, Tong Wah Lim2, Hung-Chih Chang3, Amir Radzi Ab Ghani4
(1. Faculty of Dentistry, Universiti Teknologi MARA, Malaysia, 2. Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, 3. Department of Biomedical Engineering, Hungkuang University, Taiwan, 4. College of Engineering, Universiti Teknologi MARA, Malaysia)