Submitted: 02 May 2021
Accepted: 01 Jun 2021
ePublished: 16 Dec 2021
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Avicenna J Dent Res. 2021;13(4): 113-118.
doi: 10.34172/ajdr.2021.22
  Abstract View: 749
  PDF Download: 453

Original Article

Effect of Different Bleaching Methods on Optical Behaviors of CAD/CAM Ceramics

Saeed Nikanjam 1 ORCID logo, Samaneh Abbasi 1, Sara Khazaei 1* ORCID logo

1 Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
*Corresponding Author: Correspondence to Sara Khazaei, Tel: +989128905990, Fax: +98(81)38381085, Email: , Email: sarakhazaei_83@yahoo.com


Background: The present study aimed to survey the influence of two different bleaching techniques on changes of color, translucency, and whiteness of the four CAD/CAM materials.

Methods: The monolithic blocks of Vita Suprinity, Vita Enamic, IPS e.max CAD, and Katana Zirconia were sectioned to discs with thickness of 2 mm (n=30 / each group). Samples from each type of ceramic were assigned to three subgroups: 1) the 40% hydrogen peroxide for 20 minutes; 2) the 16% carbamide peroxide for three hours/day for 2 weeks; and 3) the control. Then CIELab coordinates of each sample were evaluated before and after the intervention by a spectrophotometer. Final color change (ΔE), Whiteness (ΔWI D), and Translucency Parameter (ΔTP) were calculated. Two-way ANOVA test was adopted to analyze the data (α=0.05).

Results: Type of ceramic, bleaching subgroups, and interaction between them had a statistically significant influence on mean values of ΔE, ΔWID. The influence of bleaching subgroup on the mean value of ΔTP was also significant (P<0.001).

Conclusions: Carbamide peroxide 16% for three hours/day and for two weeks caused the most considerable changes in final color, whiteness, and translucency of the all tested CAD/CAM materials. Maximum color change and whiteness were detected in the Vita Enamic, which were clinically unacceptable.

Citation: Nikanjam S, Abbasi S, Khazaei S. Effect of different bleaching methods on optical behaviors of CAD/CAM ceramics. Avicenna J Dent Res. 2021;13(4):113-118. doi: 10.34172/ajdr.2021.22.
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