Abstract
The aim of this study was to evaluate the color difference between the facing of resin-veneered prostheses after fabrication and the original shade guide tab specified, as well as to investigate the factors affecting reproducibility. A total of 187 resin-veneered prostheses were fabricated and the color of the veneer facing was compared with the Vita Lumin Classical Shade Guide tab specified. Information regarding the shade guide tab, tooth type, position, dental laboratory, and resin material was recorded. The veneer facing of the completed prosthesis was colorimetrically measured in three regions (incisal, body, and cervical) by a spectrophotometer, and the color of the target shade guide tab was measured in the same way. The color difference (∆E*) between the veneer facing and the shade guide tab was calculated and statistically analyzed using a mixed effect model at 5% significance level. The region (p < 0.0001), shade group (p = 0.0006), and tooth type (p = 0.0066) significantly affected the ∆E* values. When regions of the tooth were compared, the biggest ∆E* value was recorded in the incisal region. Our results suggest that the region of the veneer facing is the most influential factor on color reproducibility of composite resin-veneered prostheses. Keywords: color, reproducibility, resin-veneered prosthesis, shade guide
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