1 Department of orthodontics, research office, faculty of dentistry, Mahidol university, No. 6, Yothi Road, Ratchathewi District, 10400 Bangkok, Thailand.
2 Department of orthodontics, research office, faculty of dentistry, Mahidol university, No. 6, Yothi Road, Ratchathewi District, 10400 Bangkok, Thailand. Electronic address: surachai.dec@mahidol.ac.th.
3 Department of physics, faculty of science, Mahidol university, 272 Rama VI Road, Ratchathewi District, 10400 Bangkok, Thailand.
4 Biomedical engineering research unit, National Metal and Materials Technology Center (MTEC), Pahonyothin Road, KlongNueng, KlongLuang, 12120 Pathumtani, Thailand.