Department of Biomaterials, Faculty of Dental Science, Kyushu University


九州大学大学院歯学研究院
口腔機能修復学講座生体材料学分野
Department of Biomaterials, Faculty of Dental Science, Kyushu University



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Intdoruction
 Because of recent and remarkable progress in the field of dental materials, there will obviously also be the continuing need for objective analyses of the materials used in dentistry. Our department is involved, therefore, in the study of the fundamental concepts of materials science and their relationships to the development of practical dental materials.
 Our research interest is focused on revealing the relationships between macroscopic and microscopic structures of materials to their physical, chemical, and mechanical properties. The investigations that we conduct are directed toward the development of new materials for new dental applications and the improvement of the clinical performances of existing dental materials currently in use.
 The following are brief descriptions of our departments current research projects:
(1) Setting process in calcium phosphate cements.
(2) Corrosion resistance of dental alloys.

 Up to this date, research scientists from such countries as Indonesia, China, Taiwan, and Korea have visited our department and have collaborated with us. In fact, Professor Kim Hyung-il, Chairman of the Department of Dental Materials of Pusan National University of Korea, one of Kyushu University's sister schools, carried out his research works with us for the year of 1992. Needless to say, the results of the technical interaction and exchange from his stay in this department was mutually beneficial for both parties. Collaboration between Prof. Kim's department and our department is still on-going.
 Also, one graduate student from the Philippines has now been studying in our department and, from the beginning of next semester, a plan to accept an Indonesian research student in our department has been under deliberation.

Research Programs
(1) Setting process in calcium phosphate cements.
 There are several types of calcium phosphate cements. When a mixture of tetracalcium phosphate and dicalcium phosphate is mixed with water, or when tetracalcium phosphate is mixed with polymeric acid, it will harden. Those cements form hydroxyapatite during setting or during immersion in water after setting and a good biocompatibility are expected. We are conducting some basic research of the setting process and are trying to develop the calcium phosphate cements as an alternative of hard tissues.

(2) Corrosion resistance of dental alloys.
 We are studying the effect of F ions on the corrosion behavior of Ti and Ti-alloys electrochemically. And evaluation of chemical stability is very important for dental alloys. We also developed a new method to evaluate the amount of metallic ions which dissolved out of alloys by computer simulation.