Oscar E Pecho1, Razvan Ghinea2, Erika A Navarro do Amaral3, Juan C Cardona2, Alvaro Della Bona4, María M Pérez2. 1. Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, BR 285, Km 171, 99001-970, Passo Fundo, RS, Brazil; Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071, Granada, Spain. 2. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071, Granada, Spain. 3. Department of Stomatology, School of Dentistry, University of Granada, Campus de Cartuja, s/n 18071, Granada, Spain. 4. Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, BR 285, Km 171, 99001-970, Passo Fundo, RS, Brazil. Electronic address: dbona@upf.br.
Abstract
OBJECTIVES: To evaluate relevant optical properties of esthetic direct restorative materials focusing on whitened and translucent shades. METHODS: Enamel (E), body (B), dentin (D), translucent (T) and whitened (Wh) shades for E (WhE) and B (WhB) from a restorative system (Filtek Supreme XTE, 3M ESPE) were evaluated. Samples (1 mm thick) were prepared. Spectral reflectance (R%) and color coordinates (L*, a*, b*, C* and h°) were measured against black and white backgrounds, using a spectroradiometer, in a viewing booth, with CIE D65 illuminant and d/0° geometry. Scattering (S) and absorption (K) coefficients and transmittance (T%) were calculated using Kubelka-Munk's equations. Translucency (TP) and opalescence (OP) parameters and whiteness index (W*) were obtained from differences of CIELAB color coordinates. R%, S, K and T% curves from all shades were compared using VAF (Variance Accounting For) coefficient with Cauchy-Schwarz inequality. Color coordinates and optical parameters were statistically analyzed using one-way ANOVA, Tukey's test with Bonferroni correction (α=0.0007). RESULTS: Spectral behavior of R% and S were different for T shades. In addition, T shades showed the lowest R%, S and K values, as well as the highest T%, TP an OP values. In most cases, WhB shades showed different color and optical properties (including TP and W*) than their corresponding B shades. WhE shades showed similar mean W* values and higher mean T% and TP values than E shades. SIGNIFICANCE: When using whitened or translucent composites, the final color is influenced not only by the intraoral background but also by the color and optical properties of multilayers used in the esthetic restoration.
OBJECTIVES: To evaluate relevant optical properties of esthetic direct restorative materials focusing on whitened and translucent shades. METHODS: Enamel (E), body (B), dentin (D), translucent (T) and whitened (Wh) shades for E (WhE) and B (WhB) from a restorative system (Filtek Supreme XTE, 3M ESPE) were evaluated. Samples (1 mm thick) were prepared. Spectral reflectance (R%) and color coordinates (L*, a*, b*, C* and h°) were measured against black and white backgrounds, using a spectroradiometer, in a viewing booth, with CIE D65 illuminant and d/0° geometry. Scattering (S) and absorption (K) coefficients and transmittance (T%) were calculated using Kubelka-Munk's equations. Translucency (TP) and opalescence (OP) parameters and whiteness index (W*) were obtained from differences of CIELAB color coordinates. R%, S, K and T% curves from all shades were compared using VAF (Variance Accounting For) coefficient with Cauchy-Schwarz inequality. Color coordinates and optical parameters were statistically analyzed using one-way ANOVA, Tukey's test with Bonferroni correction (α=0.0007). RESULTS: Spectral behavior of R% and S were different for T shades. In addition, T shades showed the lowest R%, S and K values, as well as the highest T%, TP an OP values. In most cases, WhB shades showed different color and optical properties (including TP and W*) than their corresponding B shades. WhE shades showed similar mean W* values and higher mean T% and TP values than E shades. SIGNIFICANCE: When using whitened or translucent composites, the final color is influenced not only by the intraoral background but also by the color and optical properties of multilayers used in the esthetic restoration.
Authors: Ioana-Sofia Pop-Ciutrila; Razvan Ghinea; Horatiu A Colosi; Javier Ruiz-López; Maria M Perez; Rade D Paravina; Diana Dudea Journal: BMC Oral Health Date: 2021-02-17 Impact factor: 2.757
Authors: Marta Zietek; Maciej Dobrzynski; Katarzyna Fita; Dorota Diakowska; Adam Watras; Rafal Jakub Wiglusz Journal: Materials (Basel) Date: 2021-11-29 Impact factor: 3.623