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Influence of artificial staining and brushing on color and surface gloss of bis-acryl and composite resins

Grant number: 19/21321-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): February 01, 2020
Effective date (End): January 31, 2021
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Eduardo Bresciani
Grantee:Thais Francielle Luiza de Arruda
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

Esthetic provisional restorations presenting color stability overtime are of great demand in clinical practice. The aim of this study is to evaluate the stability of the bis-acryl resin regarding the color and surface gloss after submission to artificial staining and brushing, in comparison with two resin composites. Samples with 5 different bis-acryl resins and 2 types of composite resin will be fabricated (N=15) with 6mm diameter and 1.5mm thickness. For bis-acryl resins, the surface inhibition layer will be removed by using ethanol, after resins are fully cured. For composite resins, a polishing protocol with #800, #1200 e #2400 grits will be adopted. The initial color measurements by L*a*b* coordinates and surface gloss will be evaluated. For color stability evaluation, the samples will be immersed in a staining broth during 7 days. For mechanical aging, the samples will be submitted to 1800 cycles of brushing. After staining and mechanical aging, color and surface gloss will be measured. Data will be analyzed by repeated measures ANOVA (variables: type of material and time) and Tukey`s test for multiple comparisons. The significance level adopted will be 5%. (AU)