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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Dental Medicine / Faculty of Dental Medicine >
Peer-reviewed Journal Articles, etc >
Phase transformation of zirconia ceramics by hydrothermal degradation
| Title: | Phase transformation of zirconia ceramics by hydrothermal degradation |
| Authors: | Kawai, Yohei Browse this author | | Uo, Motohiro Browse this author →KAKEN DB | | Wang, Yong ming Browse this author | | Kono, Sayaka Browse this author | | Ohnuki, Somei Browse this author | | Watari, Fumio Browse this author |
| Keywords: | Zirconia | | Phase transformation | | Hydrothermal degradation |
| Issue Date: | May-2011 |
| Publisher: | Japanese Society for Dental Materials and Devices |
| Journal Title: | Dental Materials Journal |
| Volume: | 30 |
| Issue: | 3 |
| Start Page: | 286 |
| End Page: | 292 |
| Publisher DOI: | 10.4012/dmj.2010-175 |
| Abstract: | Zirconia has found wide application in dentistry because of its high mechanical strength and superior esthetic properties. However, zirconia degradation caused by phase transformation occurring in a hydrothermal environment is of concern. In the present study, phase transformation and microstructure of tetragonal zirconia polycrystal partially stabilized with yttrium oxide (Y-TZP) and alumina-toughened zirconia (ATZ) sintered at different temperatures were estimated. On grazing angle X-ray diffraction analysis, ATZ showed less phase transformation to the monoclinic phase during hydrothermal treatment and this transformation appeared to occur within a few micrometers below the surface. At a higher sintering temperature the monoclinic phase content of ATZ was found to be lesser than that of Y-TZP, indicating that the alumina in ATZ was effective in suppressing hydrothermal degradation. Examination by transmission electron microscopy and studying of electron backscatter diffraction patterns indicated that grain growth in ATZ was slightly suppressed compared with that in Y-TZP at higher sintering temperatures. The present study demonstrated the effect of adding alumina to zirconia for suppressing hydrothermal degradation and studied the effect of this addition on grain growth in zirconia. |
| Rights: | Copyright © 2011 The Japanese Society for Dental Materials and Devices |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/46773 |
| Appears in Collections: | 歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 宇尾 基弘
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