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Rafael Ratto Moraes 1 Article
Color assessment of resin composite by using cellphone images compared with a spectrophotometer
Rafaella Mariana Fontes de Bragança, Rafael Ratto Moraes, André Luis Faria-e-Silva
Restor Dent Endod 2021;46(2):e23.   Published online April 5, 2021
DOI: https://doi.org/10.5395/rde.2021.46.e23
AbstractAbstract PDFPubReaderePub
Objectives

This study assessed the reliability of digital color measurements using images of resin composite specimens captured with a cellphone.

Materials and Methods

The reference color of cylindrical specimens built-up with the use of resin composite (shades A1, A2, A3, and A4) was measured with a portable spectrophotometer (CIELab). Images of the specimens were obtained individually or pairwise (compared shades in the same photograph) under standardized parameters. The color of the specimens was measured in the images using RGB system and converted to CIELab system using image processing software. Whiteness index (WID) and color differences (ΔE00) were calculated for each color measurement method. For the cellphone, the ΔE00 was calculated between the pairs of shades in separate images and in the same image. Data were analyzed using 2-way repeated-measures analysis of variance (α = 0.05). Linear regression models were used to predict the reference ΔE00 values of those calculated using color measured in the images.

Results

Images captured with the cellphone resulted in different WID values from the spectrophotometer only for shades A3 and A4. No difference to the reference ΔE00 was observed when individual images were used. In general, a similar ranking of ΔE00 among resin composite shades was observed for all methods. Stronger correlation coefficients with the reference ΔE00 were observed using individual than pairwise images.

Conclusions

This study showed that the use of cellphone images to measure the color difference seems to be a feasible alternative providing outcomes similar to those obtained with the spectrophotometer.

Citations

Citations to this article as recorded by  
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    World Journal of Dentistry.2023; 14(9): 803.     CrossRef
  • Comparison of instrumental methods for color change assessment of Giomer resins
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    Restorative Dentistry & Endodontics.2022;[Epub]     CrossRef
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