Cement opacity and color as influencing factors on the final shade of metal-free ceramic restorations

Michele Carrabba, Alessandro Vichi, Gianluca Tozzi, Chris Louca, Marco Ferrari

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Abstract

Objective: To investigate the influence of opacity and color of luting cements on the final shade of metal‐free restorations.

Materials and Methods: Five resin cement colors in combination with four different thicknesses of CAD/CAM ceramic materials were tested, and a composite substrate was used as dentin color reference (n = 3). Specimen color was measured with a spectrophotometer equipped with an integrating sphere before and after cementation (CIELAB). Cement and ceramic color and opacity (TP) were assessed by measuring the tested ceramic thickness as a 1‐mm thick disk for each of the cement shades. The differences in color were evaluated (ΔE00). Data were statistically analyzed by a Two‐Way ANOVA followed by the Tukey Test for post‐hoc comparison (P < .05) and multiple comparison Pearson's test (P < .05); the acceptability and perceptibility threshold were evaluated.

Results: Statistically significant influence was found for factors ceramic thickness and cement shade (P < .001). Perceptible and unacceptable color changes were induced on the final restoration by resin cements (ranging from ΔE00 = 0.69 ± 0.54 to ΔE00 = 5.53 ± 0.46), the correlation between factors became strong (r2 > 0.6) in case of mismatch between color and translucency of cement and ceramic. Only the clear shade in combination with the thickest ceramic, resulted in an imperceptible color change (ΔE00 = 0.69 ± 0.54).

Conclusions: The final shade of ceramic restorations can be influenced by resin cements; the magnitude of influence is related to the cement optical properties.

Clinical Significance: In order to influence the final shade of a ceramic restoration, a cement more opaque than the restorative material should be used. Conversely, in the case of a fitting shade of the restoration, a cement more translucent than the restoration should be used to avoid undesired changes.
Original languageEnglish
Pages (from-to)423-429
Number of pages7
JournalJournal of Esthetic and Restorative Dentistry
Volume34
Issue number2
Early online date13 Apr 2020
DOIs
Publication statusPublished - 1 Mar 2022

Keywords

  • ceramics
  • color science
  • dental materials
  • prosthodontics
  • resin cement

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