The effect of repeated firings on the color of an alumina ceramic system with two different veneering porcelain shades

Statement of problem Possible sources of processing variables in porcelain firing include thickness and color of the opaque; thickness, color, and translucency of the body and enamel layers; firing temperature; and number of firings. Purpose The purpose of this in vitro study was to investigate the...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2010-12, Vol.104 (6), p.372-378
Main Authors: Sahin, V., DDS, PhD, Uludag, B., DDS, PhD, Usumez, A., DDS, PhD, Ozkir, S.E., DDS, PhD
Format: Article
Language:English
Subjects:
Aluminum Oxide
Analysis of Variance
Ceramics
Color
Color temperature
Colorimetry
Colour
Crowns
Dental Porcelain
Dental Stress Analysis
Dental Veneers
Dentistry
Firing
Hot Temperature
Materials Testing
Porcelain
Prosthesis Coloring
Shades
Spectrophotometry
Veneering
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Summary:Statement of problem Possible sources of processing variables in porcelain firing include thickness and color of the opaque; thickness, color, and translucency of the body and enamel layers; firing temperature; and number of firings. Purpose The purpose of this in vitro study was to investigate the color changes of an alumina ceramic system veneered with different veneering porcelain shades and fired different numbers of times. Material and methods Twenty disc-shaped ceramic specimens (10 mm in diameter, with a core thickness of 1 mm), with 2 different veneering porcelain shades (A1, A3), were fabricated from an alumina ceramic system (Turkom-Cera) (n=10). Repeated firings (3, 5, 7, or 9 firings) were performed, and color differences (ΔE) were determined using a spectrophotometer. Repeated-measures ANOVA was used to analyze the data (number of firings, veneering porcelain color). The Duncan test and paired 2-tailed tests were used for multiple comparisons (α=.05). Results The L*a*b* values of the ceramic system were affected by the number of firings (3, 5, 7, or 9) ( P
ISSN:0022-3913
1097-6841
DOI:10.1016/S0022-3913(10)60169-2