1. Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Thammasat University, Pathumtani, Thailand
2. Department of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathumtani, Thailand
3. Department of General Dentistry, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand
4. Department of Materials of Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand