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Purpose: This study evaluated a newly developed visual shade-matching apparatus,
Shademat Visual+, as well as the influence of tab arrangement, clinician gender, and years
in practice on shade-matching quality. Materials and Methods: A group of 129 colornormal
evaluators—dental students and general dentists—matched the shade of four
ceramometal crowns using the Vitapan Classical shade guide. Crowns were positioned onto
the upper member of an artificial head and fastened to the headrest of the dental chair or
Shademat Visual+. Shade tabs were arranged according to the manufacturer’s suggestion or
according to E* in relation to the “lightest” tab and divided into groups (alternative
arrangement). The evaluators matched the shade of four ceramometal crowns both in
daylight and using the Shademat Visual+ artificial light source. The color coordinates were
determined using digital image analysis. Based on E* values, each shade-matching result
was ranked from 1 (the worst match) to 16 (the best match) points. Results: The evaluators
achieved a better result in Shademat Visual+ trials than in daylight trials (13.2 points vs 12.4
points; P < .001). For the same ceramometal crown, 12.7 points were recorded in daylight
trials with the manufacturer-suggested arrangement, and 13.7 were recorded with the
alternative arrangement (P < .001). Corresponding values for Shademat Visual+ trials were
13.6 points and 14.6 points, respectively (P < .001). Female-male and student-dentist
evaluator differences were not significant. Conclusion: The Shademat Visual+ apparatus
enabled better shade-matching results than daylight. The alternative tab arrangement
enabled better results than the manufacturer-suggested one. Gender and years in practice
did not influence shade-matching quality.
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