Optical and colorimetric evaluation of a multi-color polymer-infiltrated ceramic-network material

Rosa Pulgar; Cristina Lucena; Cristina Espinar; Oscar E Pecho; Javier Ruiz-López; Alvaro Della Bona; María M Pérez

doi:10.1016/j.dental.2019.03.010

Optical and colorimetric evaluation of a multi-color polymer-infiltrated ceramic-network material

Dent Mater. 2019 Jul;35(7):e131-e139. doi: 10.1016/j.dental.2019.03.010. Epub 2019 Apr 15.

Authors

Rosa Pulgar¹, Cristina Lucena², Cristina Espinar², Oscar E Pecho³, Javier Ruiz-López⁴, Alvaro Della Bona³, María M Pérez⁴

Affiliations

¹ Department of Stomatology, Faculty of Dentistry, University of Granada, Campus de Cartuja s/n, 18071, Granada, Spain. Electronic address: rpulgar@ugr.es.
² Department of Stomatology, Faculty of Dentistry, University of Granada, Campus de Cartuja s/n, 18071, Granada, Spain.
³ Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Brazil.
⁴ Department of Optics, Faculty of Science, University of Granada, Campus Fuentenueva, Edificio Mecenas, s/n, 18071, Granada, Spain.

PMID: 31000216
DOI: 10.1016/j.dental.2019.03.010

Abstract

Objective: To evaluate color, translucency parameter and optical properties (scattering (S), absorption (K) and transmittance (T)) of a multi-color polymer-infiltrated ceramic-network (PICN) material.

Methods: Samples of shades 1M1-HT, 1M2-HT, 2M2-HT, 3M2-HT, and 4M2-HT from VITA ENAMIC^® multiColor (E-MC) High Translucent were fabricated (n = 3). CAD-CAM blocks were cut and polished to 1.00 ± 0.01 mm of thickness. Diffuse reflectance and color coordinates were measured against white and black backgrounds, using a calibrated spectroradiometer, CIE D65 illuminant and the CIE 45°/0° geometry. Color and translucency differences were evaluated using 50:50% perceptibility (PT and TPT) and 50:50% acceptability (AT and TAT) thresholds. S and K coefficients and T were calculated using Kubelka-Munk's equations. Data was statistically analyzed using Kruskal-Wallis, Mann-Whitney tests, and VAF coefficient.

Result: Mean C* and b* values increased from incisal to cervical layers with statistically significant differences (p < 0.05). In general, ΔE₀₀ between sequential layers were above PT for all shades. In addition, translucency parameter (TP) increased from cervical to incisal and ΔTP₀₀ values were greater than TPT₀₀ and lower than TAT₀₀ between all sequential layers. Layers from all shades showed similar spectral behavior for S (97.4% ≤ VAF), K (85.0% ≤ VAF) coefficients and T (95.3% ≤ VAF). However, these values presented significant differences (p < 0.05) from cervical to incisal layers.

Significance: The gradient in color and translucency of this novel CAD-CAM multi-color PICN material can assist dental technicians and dentists to reach greater esthetics than the pre-existing CAD-CAM monolithicmaterials.

Keywords: Color; Indirect restoration; Optical properties; PINC materials; Translucency parameter.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ceramics
Color
Colorimetry*
Dental Porcelain*
Materials Testing
Polymers

Substances

Polymers
Dental Porcelain