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The Effect of Ceramic Thickness on Opalescence Publisher Pubmed



Valizadeh S1 ; Mahmoudi Nahavandi A2 ; Daryadar M3 ; Ozcan M4 ; Hashemikamangar SS5
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Authors Affiliations
  1. 1. Dental Research Center, Dentistry Research Institute, Restorative Dentistry Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Color Imaging and Color Image Processing Department, Institute for Color Science and Technology (ICST), Tehran, Iran
  3. 3. Restorative Dentist, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, University of Zurich, Zurich, Switzerland
  5. 5. Dental Research Center, Dentistry Research Institute, Department of Operative Dentistry, Dental School, Tehran University of Medical Sciences, Tehran, Iran

Source: Clinical and Experimental Dental Research Published:2020


Abstract

Objectives: Creating a tooth-like appearance by use of dental ceramics is still a challenge. Opalescence is a unique property of dental enamel, attempted to be mimicked by dental restorative materials. This study aimed to assess the effect of ceramic thickness on opalescence. Materials and methods: Twenty-four discs were fabricated of feldspathic ceramic, IPS e.max, zirconia and Enamic ceramics with 10 mm diameter and 0.5 and 1 mm thicknesses (n = 12). The opalescence of ceramic specimens was calculated by measuring the difference in yellow-blue axis (CIE ∆b*) and red-green axis (CIE ∆a*) between the transmitted and reflected spectra. One-way ANOVA was applied to compare the opalescence of different ceramic specimens with variable thicknesses at.05 level of significance. Results: The opalescence of feldspathic, IPS e.max, zirconia and Enamic ceramic specimens with 0.5 mm thickness was 1.06 ± 0.15, 3.39 ± 0.15, 1.98 ± 0.15 and 1.44 ± 0.15, respectively. By increasing the thickness to 1 mm, the opalescence of feldspathic, IPS e.max, zirconia and Enamic ceramics changed to 1.12 ± 0.15, 1.47 ± 0.15, 3.85 ± 0.15 and 2.00 ± 0.15, respectively. In all groups except for IPS e.max, the mean opalescence of 1-mm-thick specimens was higher than that of 0.5-mm-thick specimens. Conclusion: Type and thickness of ceramic affect its opalescence. The opalescence of all ceramic specimens tested in this study with 0.5 and 1 mm thicknesses was lower than that of the enamel. © 2020 The Authors. Clinical and Experimental Dental Research published by John Wiley & Sons Ltd.
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