*Gintawat Doolgindachbaporn1, Chakree Ongthiemsak2, Krittaphat Fusang3, Narit Leepong4
(1. Graduate student, Department of Prosthetic Dentistry, Prince of Songkla University, Thailand, 2. Assistant Professor, Department of Prosthetic Dentistry, Prince of Songkla University, Songkhla, Thailand, 3. Graduate student, Department of Oral and Maxillofacial Surgery, Prince of Songkla University, Thailand, 4. Assistant Professor, Department of Oral and Maxillofacial Surgery, Prince of Songkla University, Thailand)