Kyushu University Academic Staff Educational and Research Activities Database
Researcher information (To researchers) Need Help? How to update
Kishida Ryo Last modified date:2021.06.28

Graduate School

E-Mail *Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari.
 Reseacher Profiling Tool Kyushu University Pure
Official website of Department of Biomaterials, Kyushu University .
Academic Degree
Ph D
Country of degree conferring institution (Overseas)
Field of Specialization
Biomaterials, Computational Chemistry
Total Priod of education and research career in the foreign country
Research Interests
  • Fabrication and histological evaluation of porous materials and bone cements with compositions close to bone
    keyword : carbonate apatite, bone substitute, bone cement, setting reaction, porous materials
Academic Activities
1. Ryo Kishida, Maab Elsheikh, Koichiro Hayashi, Akira Tsuchiya, Kunio Ishikawa, Fabrication of highly interconnected porous carbonate apatite blocks based on the setting reaction of calcium sulfate hemihydrate granules, Ceramics International, 10.1016/j.ceramint.2021.03.324, 47, 19856-19863, 47, 19856, 2021.04, [URL], Interconnected porous carbonate apatite (CO3Ap) blocks that emulate cancellous bone have potential as an alternative to autografts. The present study aimed to evaluate the feasibility of fabricating a block via a stepwise compositional transformation to CO3Ap through dissolution-precipitation reactions of an interconnected porous calcium sulfate dihydrate (CSD) block, which was obtained by the setting reaction of calcium sulfate hemihydrate (CSH) granules. Exposure of the CSH granules to water resulted in a setting reaction. However, the gaps between the granules were clogged, preventing the fabrication of interconnected porous structures. Removing the water in the gaps using filter paper was beneficial in avoiding gap clogging and in fabricating interconnected porous CSD blocks. Although the CSD blocks transformed into CaCO3 blocks, which maintained the interconnected porous structure through a dissolution-precipitation reaction in a Na2CO3 solution, their mechanical strength was quite low (diametral tensile strength: DTS = 75 kPa). In contrast, a CaCO3 block with a much greater mechanical strength (DTS = 0.98 MPa) was fabricated when a calcium sulfate anhydrous block made via the heat treatment of the CSD block was used as a precursor. The CaCO3 block transformed into a CO3Ap block (DTS = 2.1 MPa), maintaining the interconnected porous structure through a dissolution-precipitation reaction when immersed in a Na2HPO4 solution. The CO3Ap block had macropores initiated by the gaps between the granules and micropores created by the setting reaction of CSH granules and the dissolution-precipitation reactions to form CO3Ap. The results obtained in the present study demonstrate that this method is useful for fabricating interconnected porous CO3Ap blocks..
Membership in Academic Society
  • Japanese Society for Pigment Cell Research
  • The Japanese Society of Applied Physics
  • The Physical Society of Japan
  • Japanese Society for Biomaterials
  • The Japanese Society for Dental Materials and Devices