1. Department of Orthodontics, Graduate School of Dentistry, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan
2. Department of Oral Implantology, Osaka Dental University, 1-5-17 Otemae, Chuo-ku, Osaka 540-0008, Japan
3. Department of Biomaterials, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan
4. Department of Orthodontics, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata, Osaka 573-1121, Japan