1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Hatyai 90112, Songkhla, Thailand
2. Department of Prosthetic Dentistry, Faculty of Dentistry, Prince of Songkla University, Hatyai 90112, Songkhla, Thailand
3. Department of Chemistry, Faculty of Science, Chiang Mai University, Amphur Muang 50200, Chiang Mai, Thailand