Translucency parameter of conventional restorative glass-ionomer cements

Joana Yumi Teruya Uchimura; Francielle Sato; Rosangela Getirana Santana; Rafael Menezes-Silva; Ligia S Bueno; Ana Flávia Sanches Borges; Maria Fidela de Lima Navarro; John W Nicholson; Sharanbir K Sidhu; Renata Corrêa Pascotto

doi:10.1111/jerd.12685

Translucency parameter of conventional restorative glass-ionomer cements

J Esthet Restor Dent. 2021 Sep;33(6):935-942. doi: 10.1111/jerd.12685. Epub 2020 Nov 14.

Affiliations

¹ Department of Dentistry, State University of Maringá, Maringá, Paraná, Brazil.
² Department of Physics, State University of Maringá, Maringá, Paraná, Brazil.
³ Department of Statistics, State University of Maringá, Maringá, Paraná, Brazil.
⁴ Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru School of Dentistry-FOB-USP Bauru, São Paulo, Brazil.
⁵ Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.

PMID: 33188585
DOI: 10.1111/jerd.12685

Abstract

Objective: To evaluate the translucency parameter (TP) and contrast ratio (CR) of different conventional restorative glass-ionomer cements (GICs).

Materials and methods: Eighteen brands of GICs were evaluated. Five disks of each material were made following ISO 9917-1. The luminous reflectance and Central Bureau of the International Commission on Illumination parameters of disks were evaluated using a colorimeter, against backings of white and black, to obtain the translucent parameter and contrast ratio of different brands of glass-ionomer cements. The correlation between translucency parameter and contrast ratio was assessed with the Pearson correlation test. The translucent and contrast ratio parameters values were submitted to the one-way ANOVA and Tukey test for multiple comparisons (p < 0.05).

Results: There was a strong inverse relationship between CR and TP (r² = 0.94, p < 0.001). The contrast ratio decreased as translucency increased. There were significant differences in TP and CR among brands (p < 0.001).

Conlusions: GICs exhibit different translucency and contrast ratio behavior. Some brands of GICs presented very low TP and this condition would be unacceptable for areas with esthetic demands. In addition, TP and CR showed a strong linear relationship.

Clinical significance: The results found in this study demonstrated that the knowledge of the translucency and CR of different conventional restorative GICs is important in order to guide clinicians in the selection of restorative GICs for anterior teeth.

Keywords: color; dental materials; glass-ionomer cements; opacity; translucency.

Publication types

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

MeSH terms

Glass Ionomer Cements*
Materials Testing

Substances

Glass Ionomer Cements