Work

Effect of Four Bleaching Regimens on Color Changes and Microhardness of Dental Nanofilled Composite

Year: 2009

Type: article

Abstract: Objective. The purpose of this study was to compare the color changes and microhardness of a nanocomposite after four bleaching regimens. Materials. Twenty-five specimens (n = 25) were made with a nanocomposite resin (Filtek Supreme XT). The specimens were divided into five groups equally (n = 5): bleaching groups and control group, as follows: G1: artificial saliva at 37 degrees C; (control) G2: hydrogen peroxide (HP) at 7%; G3: hydrogen peroxide (HP) at 35%; G4: carbamide peroxide (CP) at 10%; G5: carbamide peroxide (CP) 35%. Color measurements were made with spectrophotometer using CIELAB color scale. The Vickers hardness (VHN) measurements were performed at the top surface. The data were analyzed with two-way Analysis of Variance. Results. DeltaE and VHN mean values into the groups were not statistically different, however, the VHN mean values before and after storage and bleaching showed statistically significant differences. Conclusion. Nanocomposite samples showed no significant alteration (color and microhardness) after bleaching. Thus, no replacement of restorations is required after bleaching.

Source: International Journal of Dentistry

DOI: 10.1155/2009/313845

Authors: Simone Xavier Silva Costa, Anne Buss Becker, Alessandra Nara de Souza Rastelli, Leonor de Castro Monteiro Loffredo, Marcelo Ferrarezi de Andrade, Vanderlei Salvador Bagnato

Institutions: Universidade Estadual Paulista (Unesp), Universidade Franciscana, Universidade de São Paulo, Instituto de Física de São Carlos

Language: English

Topic: Dental materials and restorations

Subfield: General Dentistry

Field: Dentistry

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $1,560