The influence of grain size on low temperature degradation of dental zirconia

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Author(s) Hallmann, Lubica, Mehl, Albert, Ulmer, Peter, Reusser, Eric, Stadler, Johannes, Zenobi, Renato, Stawarczyk, Bogna, Özcan, Mutlu, Hämmerle, Christoph H.F.
Publication Type Journal Items, Publication Status: Published
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Title The influence of grain size on low temperature degradation of dental zirconia
Author(s) Hallmann, Lubica
Mehl, Albert
Ulmer, Peter
Reusser, Eric
Stadler, Johannes
Zenobi, Renato
Stawarczyk, Bogna
Özcan, Mutlu
Hämmerle, Christoph H.F.
Journal or Series Title Journal of biomedical materials research. Part B, Applied biomaterials
Volume Number 100B
Issue Number 2
Start Page 447
End Page 456
ISSN 1552-4973
Publisher Wiley
Publication Place Hoboken, NJ
Publication Date 2012-02
Keyword(s) Dental zirconia (Y-TZP)
Grain size
Air abrasion
Tensile stress
Abstract The purpose of this study was to evaluate the influence of grain size and air abrasion on low-temperature degradation (LTD) of yttria stabilized tetragonal zirconia polycrystalline (Y-TZP). Disc-shaped specimens were sintered at 1350, 1450, and 1600°C. Air abrasion was performed with different abrasive particles. The specimens were stored for 2 h at 134°C under 2.3 bar water vapor pressure. All specimens were characterized by X-ray powder diffraction analysis (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and field emission scanning electron microscopy (FESEM). Y-TZP sintered at a temperature of 1350°C did not undergo the t–m phase transformation during accelerated aging. The diffusion-controlled t–m phase transformation initiated with the specimens sintered at 1450°C. This transformation was remarkable for the specimens sintered at 1600°C. X-ray photoelectron spectroscopy (XPS) measurements did not confirm the generation of Zr-OH and Y-OH bonds. No increase of yttrium concentration on the grain boundaries of Y-TZP was detected, which could be responsible for the destabilization of dental zirconia ceramics. A slight increase of diffusion-controlled t–m phase transformations was observed for all abraded specimens sintered at 1350 and 1450°C. The size of abrasive particles did not play a crucial role on LTD of Y-TZP. The retardation of diffusion-controlled t–m phase transformation was evident for all abraded specimens sintered at 1600°C by comparison to non-abraded specimens. Conclusion: The LTD of Y-TZP can be suppressed when the sintering temperature is set between 1350 and 1450°C.
DOI 10.1002/jbm.b.31969
Additional Notes Manuscript received 13 July 2011, Revised 29 August 2011, Accepted 6 September 2011, Article first published online 25 November 2011
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
Organisational Unit(s)
NEBIS System Number 001565454
Source Database ID FORM-1326378907
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  author = "Hallmann, Lubica and Mehl, Albert and Ulmer, Peter and Reusser, Eric and Stadler, Johannes and Zenobi, Renato and Stawarczyk, Bogna and {\"{O}}zcan, Mutlu and H{\"{a}}mmerle, Christoph H.F.",
  title = "{T}he influence of grain size on low temperature degradation of dental zirconia",
  journal = "Journal of biomedical materials research. Part B, Applied biomaterials",
  year = 2012,
  volume = "100B",
  number = "2",
  pages = "447--456",
  month = feb,

E-Citations record created: Thu, 12 Jan 2012, 14:35:30 CET