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

Takashi Nakamura, Hirofumi Usami, Hiroshi Ohnishi, Miyuki Takeuchi, Hisataka Nishida, Tohru Sekino, Hirofumi Yatani

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)330-335
Number of pages6
JournalDental materials journal
Volume30
Issue number3
DOIs
Publication statusPublished - 2011 May

Keywords

  • Accelerated aging test
  • Degradation
  • Silica
  • Zirconia

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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