Crystallographic and morphological analysis of sandblasted highly translucent dental zirconia

Masanao Inokoshi, Haruki Shimizu, Kosuke Nozaki, Tomohiro Takagaki, Kumiko Yoshihara, Noriyuki Nagaoka, Fei Zhang, Jozef Vleugels, Bart Van Meerbeek, Shunsuke Minakuchi

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28 Citations (Scopus)

Abstract

Objective: To assess the influence of alumina sandblasting on four highly translucent dental zirconia grades. Methods: Fully sintered zirconia disk-shaped specimens (15-mm diameter; 0.5-mm thickness) of four highly translucent yttria partially stabilized zirconia (Y-PSZ) grades (KATANA HT, KATANA STML, KATANA UTML, Kuraray Noritake; Zpex Smile, Tosoh) were sandblasted with 50-μm alumina (Al2O3) sand (Kulzer) or left ‘as-sintered’ (control) (n = 5). For each zirconia grade, the translucency was measured using a colorimeter. Surface roughness was assessed using 3D confocal laser microscopy, upon which the zirconia grades were statistically compared for surface roughness using a Kruskal–Wallis test (n = 10). X-ray diffraction (XRD) with Rietveld analysis was used to assess the zirconia-phase composition. Micro-Raman spectroscopy was used to assess the potentially induced residual stress. Results: The translucency of KATANA UTML was the highest (36.7 ± 1.8), whereas that of KATANA HT was the lowest (29.5 ± 0.9). The ‘Al2O3-sandblasted’ and ‘as-sintered’ zirconia revealed comparable surface-roughness Sa values. Regarding zirconia-phase composition, XRD with Rietveld analysis revealed that the ‘as-sintered’ KATANA UTML contained the highest amount of cubic zirconia (c-ZrO2) phase (71 wt%), while KATANA HT had the lowest amount of c-ZrO2 phase (41 wt%). KATANA STML and Zpex Smile had a comparable zirconia-phase composition (60 wt% c-ZrO2 phase). After Al2O3-sandblasting, a significant amount (over 25 wt%) of rhombohedral zirconia (r-ZrO2) phase was detected for all highly translucent zirconia grades. Significance: Al2O3-sandblasting did not affect the surface roughness of the three highly translucent Y-PSZ zirconia grades, but it changed its phase composition.

Original languageEnglish
Pages (from-to)508-518
Number of pages11
JournalDental Materials
Volume34
Issue number3
DOIs
Publication statusPublished - Mar 2018

Keywords

  • Alumina sandblasting
  • Micro-Raman
  • Stress
  • XRD
  • Zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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    Inokoshi, M., Shimizu, H., Nozaki, K., Takagaki, T., Yoshihara, K., Nagaoka, N., Zhang, F., Vleugels, J., Van Meerbeek, B., & Minakuchi, S. (2018). Crystallographic and morphological analysis of sandblasted highly translucent dental zirconia. Dental Materials, 34(3), 508-518. https://doi.org/10.1016/j.dental.2017.12.008