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Journal of Prosthetic Dentistry

Effect of surface treatment and surface region on the color stainability of a cemented high-translucency monolithic zirconia ceramic after coffee thermocycling

  • Farhad Tabatabaian
    Correspondence
    Corresponding author: Dr Farhad Tabatabaian, Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Daneshjoo Boulevard, Tehran 1983963113, IRAN
    Affiliations
    PhD student, Faculty of Dentistry, The University of British Columbia, Vancouver, Canada

    Associate Professor, Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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  • Sara Vali
    Affiliations
    Former student, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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  • Mahshid Namdari
    Affiliations
    Assistant Professor of Biostatistics, Department of Community Oral Health, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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      Abstract

      Statement of problem

      Restorations should show low color stainability after clinical and laboratory procedures; however, the impacts of surface treatment and surface region on the color stainability of zirconia restorations are unclear.

      Purpose

      The purpose of this in vitro study was to evaluate the effect of surface treatment and surface region on the color stainability of a cemented high-translucency monolithic zirconia ceramic after coffee thermocycling.

      Material and methods

      Thirty high-translucency Ø10×0.5-mm monolithic zirconia disk specimens were divided into 3 groups based on the surface treatment applied: adjusting (A), polishing (P), and glazing (G). Specimens were cemented to composite resin backings and given 10 000 thermocycles in a coffee solution. CIELab values were measured with a spectrophotometer before and after thermocycling in central and marginal surface regions. ΔE00 values were calculated and compared with perceptibility (ΔE00=0.8) and acceptability (ΔE00=1.8) thresholds to interpret the color changes due to coffee thermocycling. Repeated measures ANOVA and Bonferroni tests were used for data analysis (α=.05).

      Results

      Mean ΔE00 values ranged between 0.72 and 1.26. The surface treatment significantly affected the ΔE00 (P=.005); however, the surface region (P=.499) and the interaction of surface treatment and surface region (P=.998) did not affect the ΔE00. The mean ΔE00 values were less than 0.8 for group G, but greater than 0.8 and less than 1.8 for groups A and P.

      Conclusions

      Glazing provides the lowest color stainability for cemented high-translucency monolithic zirconia, inducing imperceptible color changes after coffee thermocycling.
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