Dr. Kokubo received his DDS degree from Tsurumi University School of Dental Medicine in 1986. In 1990, he finished his post-graduate coursework and obtained PhD degree from Tsurumi University. From 1990, Dr. Kokubo was lecturer at Tsurumi University School of Dental medicine, Department of Fixed Prosthodontics. From 1999 to 2000, he was a guest researcher at Malmö University, Sweden. In 2001, he became an assistant professor at Tsurumi University Department of Fixed Prosthodontics, and from 2002, he also became assistant professor for division of Oral & Maxillofacial Implantology. Dr. Kokubo is certified dentist of the Japan Prosthodontics Society and Japanese Society of Oral Implantology.