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Influence of illuminates and saliva layer on the perception of resin composite surface gloss by different observers

Grant number: 15/07764-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2015
Effective date (End): August 31, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Eduardo Bresciani
Grantee:Fernanda Bastos Pereira Tessarin
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

Objective: To evaluate the visual perception of observers (lay person, undergraduate students and dental professionals) on the surface gloss of resin composite, under different illuminants and the presence of a layer of artificial saliva. Methods: Twelve cylindrical specimens (S), with 6mm in diameter and 1mm thickness, will be fabricated in nanofilled resin composite (Filtek Z350) in color A2E. The polishing of S will be performed for division into 6 groups, with surface gloss values at 10, 25, 40, 55, 70 or 85. The polishing protocol and gloss values for each group will be determined by pilot tests. A gloss meter for flat and curved surfaces - NOVOCURVE (TM RHOPOINT, East Sussex, England) will assess the surface gloss of specimens. Fifteen subjects from ICT - UNESP will be selected, 5 lay people, 5 undergraduate students, and 5 dental professionals. They will sign the written informed consent form for participation in the study. The participants will observe each S in comparison with a standard in bovine enamel in a light box (MM-2e / UV Konica Minolta), under different illuminants (D65 - natural light, A - incandescent light, and F - fluorescent light) and the presence of a layer of artificial saliva. Each observer will perform 36 readings. Observers will classify the degree of surface gloss according to S comparing to the standard, following the parameters: a - S presents less surface gloss than the standard, b- S presents similar surface gloss as the standard, and c - S presents greater surface gloss than the standard. The data will be tabulated and analyzed by non-parametric tests at 5% significance level.