The effect of repetitive firings on the color of an alumina ceramic system with varying ceramic shade and thickness

Objective The color of all‐ceramic restorations is one of the main criteria to achieve esthetical success. Many factors such as ceramic thickness, condensation techniques, firing temperature, and numbers can affect the final color of restoration. The purpose of this study was to investigate the colo...

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Bibliographic Details
Published in:	Journal of esthetic and restorative dentistry Vol. 31; no. 5; pp. 471 - 477
Main Authors:	Şahin, Volkan, Gülgezen Aydın, Hilal, Akyel, Alim, Uludağ, Bülent C.
Format:	Journal Article
Language:	English
Published:	Hoboken, USA John Wiley & Sons, Inc 01-09-2019 Blackwell Publishing Ltd
Subjects:	alumina ceramics Aluminum Oxide Ceramics CIEDE 2000 Color color change dental ceramics Dental Porcelain Dental restorative materials Dental Veneers Dentistry Materials Testing Prosthesis Coloring repeated firings Shade Statistical analysis Studies Surface Properties alumina ceramics repeated firings CIEDE 2000 dental ceramics color change
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Summary:	Objective The color of all‐ceramic restorations is one of the main criteria to achieve esthetical success. Many factors such as ceramic thickness, condensation techniques, firing temperature, and numbers can affect the final color of restoration. The purpose of this study was to investigate the color changes in alumina‐based ceramic system according to ceramic shade and thickness during the multiple firings. Materials and Methods Sixty disc‐shaped specimens with two different veneering porcelain shades (A1 or A3), and with three different ceramic thicknesses (0.5, 1, or 1.5 mm), were fabricated from an alumina‐based ceramic system. Multiple firings (3, 5, 7, or 9 firings) were performed, and color changes (ΔE00) were determined using a spectrophotometer. Repeated‐measures ANOVA were used to analyze the data. The Duncan test was used for multiple comparisons (α = .05). Results The Lab* values of the specimens were affected by the number of firings (3, 5, 7, or 9), veneering ceramic shades (A1 or A3) and veneering ceramic thicknesses (0.5, 1, or 1.5 mm). Significant interactions were present between the number of firings, veneering ceramic shade, and veneering ceramic thickness for L* (p < .001), a* (p < .001), and b* (p < .001) values. Conclusions No statistically significant color change was observed between 3rd and 9th firings. Clinical Significance Veneering ceramic shade, veneering ceramic thickness, and number of firings should be carefully considered to obtain an acceptable color match of the definitive restorations.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1496-4155 1708-8240
DOI:	10.1111/jerd.12489