1. The in vitro and in vivo validation of a mobile non-contact camera-based digital imaging system for tooth colour measurement.
- Author
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Smith, Richard N, Collins, Luisa Z, Naeeni, Mojgan, Joiner, Andrew, Philpotts, Carole J, Hopkinson, Ian, Jones, Clare, Lath, Darren L, Coxon, Thomas, Hibbard, James, and Brook, Alan H
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COLORIMETRY equipment , *DIGITAL image processing , *PHOTOGRAPHIC equipment , *TOOTH anatomy , *CUSPIDS , *INCISORS , *COLOR , *COMPARATIVE studies , *RESEARCH methodology , *MEDICAL cooperation , *RESEARCH , *TIME , *PRODUCT design , *EVALUATION research , *RANDOMIZED controlled trials , *RESEARCH bias , *ANATOMY , *EQUIPMENT & supplies ,RESEARCH evaluation - Abstract
Objective: To assess the reproducibility of a mobile non-contact camera-based digital imaging system (DIS) for measuring tooth colour under in vitro and in vivo conditions.Methods: One in vitro and two in vivo studies were performed using a mobile non-contact camera-based digital imaging system. In vitro study: two operators used the DIS to image 10 dry tooth specimens in a randomised order on three occasions. In vivo study 1:25 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS on four consecutive days by one operator to measure day-to-day variability. On one of the four test days, duplicate images were collected by three different operators to measure inter- and intra-operator variability. In vivo study 2:11 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS twice daily over three days within the same week to assess day-to-day variability. Three operators collected images from subjects in a randomised order to measure inter- and intra-operator variability.Results: Subject-to-subject variability was the largest source of variation within the data. Pairwise correlations and concordance coefficients were > 0.7 for each operator, demonstrating good precision and excellent operator agreement in each of the studies. Intraclass correlation coefficients (ICCs) for each operator indicate that day-to-day reliability was good to excellent, where all ICC's where > 0.75 for each operator.Conclusion: The mobile non-contact camera-based digital imaging system was shown to be a reproducible means of measuring tooth colour in both in vitro and in vivo experiments. [ABSTRACT FROM AUTHOR]- Published
- 2008
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