J Adv Prosthodont.  2013 Aug;5(3):296-304. 10.4047/jap.2013.5.3.296.

Effect of polishing and glazing on the color and spectral distribution of monolithic zirconia

Affiliations
  • 1Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea. swallow@snu.ac.kr

Abstract

PURPOSE
The aim of this study was to evaluate the effect of polishing and glazing on the color and spectral distribution of monolithic zirconia.
MATERIALS AND METHODS
Forty-five monolithic zirconia specimens (16.3 mm x 16.4 mm x 2.0 mm) were fabricated and divided into 5 groups according to the number of A2-coloring liquid applications (Group I to V). Each group was divided into 3 subgroups according to the method of surface treatments (n=3): N: no treatment; P: polishing; G: glazing. Color and spectral distribution of five different areas of each specimen were measured according to CIELAB color space in the reflectance mode relative to the standard illuminant D65 on a reflection spectrophotometer. Data were analyzed using one-way ANOVA followed by Tukey's HSD test, Pearson correlation and regression analysis (alpha=.05).
RESULTS
There was a significant difference in CIE L* between Subgroup N and P, and in CIE b* between Subgroup P and G in each group. Spectral reflectance generally decreased in Subgroup P and G in comparison with Subgroup N. Color differences between Subgroup P and G were within the perceptibility threshold (DeltaE*ab< 3.7) in most groups. Highly significant correlation was found between CIE b*and each subgroups as the number of coloring liquid applications increased (R2>0.88, P<.001).
CONCLUSION
A perceptible color difference can be detected after polishing of monolithic zirconia. Polishing decreases the lightness, and glazing also decreases the lightness, but increases the yellowness of monolithic zirconia.

Keyword

Zirconia-based ceramic; Color; Dental polishing; Surface properties

MeSH Terms

Dental Polishing
Light
Surface Properties
Zirconium
Zirconium

Figure

  • Fig. 1 Spectral reflectance of each subgroup in Group I against white background.

  • Fig. 2 Spectral reflectance of each subgroup in Group II against white background.

  • Fig. 3 Spectral reflectance of each subgroup in Group III against white background.

  • Fig. 4 Spectral reflectance of each subgroup in Group IV against white background.

  • Fig. 5 Spectral reflectance of each subgroup in Group V against white background.

  • Fig. 6 Spectral reflectance of each group within Subgroup N.

  • Fig. 7 Spectral reflectance of each group within Subgroup P.

  • Fig. 8 Spectral reflectance of each group within Subgroup G.

  • Fig. 9 Linear regression of CIE b* values of each subgroup over a zero calibration box in the reflectance mode as a function of the number of coloring liquid applications.

  • Fig. 10 Linear regression of CIE L* values of each subgroup over a zero calibration box in the reflectance mode as a function of the number of coloring liquid applications.

  • Fig. 11 Linear regression of CIE a* values of each subgroup over a zero calibration box in the reflectance mode as a function of the number of coloring liquid applications.


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