The effect of adding silica to zirconia to counteract zirconia's tendency to degrade at low temperatures

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概要

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• Yttria-based zirconia material (Y-TZP) widely used in dentistry, may degrade in a humid, low-temperature environment such as that in the oral cavity. The aim of this study was to compare the degradation of a new silica doped Y-TZP material with that of conventional Y-TZP by using accelerated aging tests at 200°C. The results of the accelerated tests revealed that after 50 hours of aging, the conventional Y-TZP samples had damaged surfaces that were weakened by 50 to 60%, while the silica-doped Y-TZP samples were only weakened by less than 20%. The monoclinic content of the conventional Y-TZP samples increased substantially to 62.7%, however, that of silica-doped Y-TZP samples was 18.9% after 5 hours of aging. It was concluded that a new type of silica-doped Y-TZP, created by adding a small amount of silica to Y-TZP, will be more resistant to low temperature degradation than conventional Y-TZP.

著者

• Sekino Tohru

  Institute Of Multidisciplinary Research For Advanced Materials (imram) Tohoku University

• Yatani Hirofumi

  Department Of Fixed Prosthodontics

• NISHIDA Hisataka

  Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry

• TAKEUCHI Miyuki

  Nikkato Corporation

• Ohnishi Hiroshi

  Nikkato Corp. Osaka Jpn

• Usami Hirofumi

  Department Of Fixed Prosthodontics Osaka University Graduate School Of Dentistry

• Nakamura Takashi

  Department Of Cardiology Saiseikai Shiga Hospital

• NISHIDA Hisataka

  Department of Operative Dentistry, Osaka Dental University

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