Comparison of instrumental methods for color change assessment of Giomer resins
de Almeida Queiroz Ferreira Luiza, da Cunha Peixoto Rogeli Tiburcio Ribeiro, de Magalhaes Claudia Silami, Sa Tassiana Melo, Yamauti Monica, Jardilino Francisca Daniele Moreira,
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( de Almeida Queiroz Ferreira Luiza ) - Universidade Federal de Minas Gerais School of Dentistry Post-Graduate Program
( da Cunha Peixoto Rogeli Tiburcio Ribeiro ) - Universidade Federal de Minas Gerais School of Dentistry Department of Restorative Dentistry
( de Magalhaes Claudia Silami ) - Universidade Federal de Minas Gerais School of Dentistry Department of Restorative Dentistry
( Sa Tassiana Melo ) - Centro Universitario de Belo Horizonte School of Dentistry Department of Prosthodontics
( Yamauti Monica ) - Hokkaido University Faculty of Dental Medicine Department of Restorative Dentistry
( Jardilino Francisca Daniele Moreira ) - Universidade Federal de Minas Gerais School of Dentistry Department of Clinic, Pathology and Dental Surgery
Abstract
Objectives: The aim of this study was to compare the color change of the Giomer resin composite (Beautifil-Bulk) by using photographs obtained with a smartphone (iPhone 6S) associated with Adobe Photoshop software (digital method), with the spectrophotometric method (Vita Easyshade) after immersion in different pigment solutions.
Materials and Methods: Twenty resin composite samples with a diameter of 15.0 mm and thickness of 1.0 mm were confectioned in A2 color (n = 5). Photographs and initial color readings were performed with a smartphone and spectrophotometer, respectively. Then, samples were randomly divided and subjected to cycles of immersion in distilled water (control), acai, Coke, and tomato sauce, 3 times a day, 20 minutes for 7 days. Later, new photographs and color readings were taken.
Results: The analysis (2-way analysis of variance, Holm-Sidak, p < 0.05) demonstrated no statistical difference (p < 0.005) between the methods in all groups. Similar color changes were observed for all pigment solutions when using the spectrophotometric method. For the digital method, all color changes were clinically unacceptable, with distilled water and tomato sauce similar to each other and with statistical differences (p < 0.005) for Coke and acai.
Conclusions: Only the tomato sauce produced a color change above the acceptability threshold using both methods of color assessment. The spectrophotometric and digital methods produce different patterns of color change. According to our results, the spectrophotometric method is more recommended in color change assessment.
키워드
Aesthetics; Coloring agents; Composite resins; Image processing, computer-assisted; Spectrophotometry
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