Color matching of full ceramic versus metal-ceramic crowns - a spectrophotometric study

Medicine and Pharmacy Reports
Delia Cristina GreţaDiana Dudea

Abstract

To verify the color match of metal-ceramic and full ceramic crowns, using instrumental methods. A number of 153 teeth (anterior and posterior teeth), in 62 patients, were restored with metal ceramic (MC, n=119), pressed-ceramic (PC, n=28), and zirconia-ceramic (ZC, n=6) full coverage crowns. The shade of a reference natural tooth was recorded instrumentally with a dental spectrophotometer (Vitaeasyshade Advance 4.0) in "single tooth measurement", which provided the base color in Vita Classic (VC) and Vita 3D Master shades (3D).For verifying the outcome of the restoration "verify restoration" mode was used, and ΔE values were recorded for both VC and 3D Master shade guides. Moreover, matching symbols were also recorded (***=good, **=fair, *=poor). Descriptive statistics was performed and data were analyzed (One-sample z-Test, α=0.05) for comparison with visual thresholds in dentistry (Perceptibility Threshold - PT=1.2 and Acceptability Threshold - AT=2.7). The data did not follow a normal distribution (Kolmogorov-Smirnov test, p<0.05). Recorded color difference was significantly higher than PT and AT, for all types of restorations, regardless of the coding system (p<0.05). For MC crowns in 2.52% (4.20% for 3D) of the cases the c...Continue Reading

Software Mentioned

StatPlus : mac
VitaEasyshade Advance
SPSS Statistic
Vita 3D
AnalystSoft
CIELAB
VITA Classical
VitaClassic
Vita Easyshade Advance
3DMaster

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