Luo, W, Naeeni, M, Platten, S et al. (4 more authors) (2017) The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement. Journal of Dentistry, 67 (Suppl). S15-S19. ISSN 0300-5712
Abstract
Objectives: To assess the robustness of a new custom built video-based digital imaging system (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions. Methods: The VDIS imaging system was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n = 14) stored in water and VITA Classical shade guide tabs (SG, n = 16). These were measured by the VDIS at baseline, 5 min, 2 h, 1 week and 2 weeks to evaluate the system repeatability. For in vivo validation, adult volunteers (male/female, n = 34) with two natural, unrestored central incisors had their teeth imaged using the VDIS at baseline, 5 min and 2 h (3 images each) by two different operators to evaluate time and operator effects. Between taking individual images, subjects moved from the imaging-frame to assess the effect of re-positioning on reproducibility. From the in vitro and in vivo images, the average tooth RGB values were obtained, and the CIELAB values and a tooth whiteness index WIO value were calculated. Repeatability and reproducibility of VDIS imaging system was assessed using appropriate repeated measurement analysis techniques and ANOVA. Results: The measurement variations in vitro were between 1 and 2 units of ΔWIO and the average colour differences were less than 1 ΔE*ab unit. For the in vivo study, analysis of the CIELAB parameters and WIO showed that subject variability accounted for between 82 and 99% of the observed variability in the measurement process. The operator variability was less than 0.5% and the overall measurement error was found to be only 0.3% for WIO. Across assessment times the variability was less than 0.5%. Conclusions: The dental imaging system V-DIS was shown to be a highly reproducible means for tooth colour and whiteness measurement. Clinical significance: Digital imaging based techniques gives a highly reproducible approach to measuring tooth colour.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Elsevier Ltd. This is an author produced version of a paper published in Journal of Dentistry. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Colour; Tooth whiteness; Repeatability; Reproducibility; Clinical |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Arts, Humanities and Cultures (Leeds) > School of Design (Leeds) |
Funding Information: | Funder Grant number Unilever UK Central Resources Ltd MA-2015-01039 |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Dec 2017 15:26 |
Last Modified: | 09 Dec 2018 01:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jdent.2017.09.012 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125422 |
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