title: Could digital imaging be an alternative for digital colorimeters?
abstract: This study evaluated the colour parameters of composite and ceramic shade guides determined using a colorimeter and digital imaging method with illuminants at different colour temperatures. Two different resin composite shade guides, namely Charisma (Heraeus Kulzer) and Premise (Kerr Corporation), and two different ceramic shade guides, Vita Lumin Vacuum (VITA Zahnfabrik) and Noritake (Noritake Co.), were evaluated at three different colour temperatures (2,700 K, 2,700-6,500 K, and 6500 K) of illuminants. Ten shade tabs were selected (A1, A2, A3, A3,5, A4, B1, B2, B3, C2 and C3) from each shade guide. CIE Lab values were obtained using digital imaging and a colorimeter (ShadeEye NCC Dental Chroma Meter, Shofu Inc.). The data were analysed using two-way ANOVA, and Pearson's correlation. While mean L* values of both composite and ceramic shade guides were not affected from the colour temperature, L* values obtained with the colorimeter showed significantly lower values than those of the digital imaging (p < 0.01). At combined 2,700-6500 K colour temperature, the means of a* values obtained from colorimeter and digital imaging did not show significant differences (p > 0.05). For both composite and ceramic shade guides, L* and b* values obtained from colorimeter and digital imaging method presented a high level of correlation. High-level correlations were also acquired for a* values in all shade guides except for the Charisma composite shade guide. Digital imaging method could be an alternative for the colorimeters unless the proper object-camera distance, digital camera settings and suitable illumination conditions could be supplied. However, variations in shade guides, especially for composites, may affect the correlation.
authors.affiliation: Faculty of Dentistry, Department of Prosthetic Dentistry, Başkent University, Ankara, Turkey.
authors.forename: Alper
authors.initials: A
authors.lastname: Caglar
authors.forename: Kivanc
authors.initials: K
authors.lastname: Yamanel
authors.forename: Kamran
authors.initials: K
authors.lastname: Gulsahi
authors.forename: Bora
authors.initials: B
authors.lastname: Bagis
authors.forename: Mutlu
authors.initials: M
authors.lastname: Ozcan
mesh_terms: D003116:Color; D003124:Colorimetry / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008029:Lighting / Q000295:instrumentation; D008422:Materials Testing; D010781:Photography / Q000295:instrumentation; D012984:Software; D013696:Temperature
chemical_list: C084111:Charisma composite resin; D003188:Composite Resins; D003764:Dental Materials; C507210:premise composite resin; D003776:Dental Porcelain
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