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Could digital imaging be an alternative for digital colorimeters?

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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.

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Authors and Affiliations

  1. Faculty of Dentistry, Department of Prosthetic Dentistry, Başkent University, Ankara, Turkey

    Alper Caglar, Kivanc Yamanel & Kamran Gulsahi

  2. Faculty of Dentistry, Department of Prosthetic Dentistry, Karadeniz Technical University, Trabzon, Turkey

    Bora Bagis

  3. Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zürich, Zurich, Switzerland

    Mutlu Özcan

Authors
  1. Alper Caglar
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  2. Kivanc Yamanel
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  3. Kamran Gulsahi
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  4. Bora Bagis
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  5. Mutlu Özcan
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Correspondence to Mutlu Özcan.

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Caglar, A., Yamanel, K., Gulsahi, K. et al. Could digital imaging be an alternative for digital colorimeters?. Clin Oral Invest 14, 713–718 (2010). https://doi.org/10.1007/s00784-009-0329-6

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  • DOI: https://doi.org/10.1007/s00784-009-0329-6

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