Influence of bleaching treatment on flexural resistance of hybrid materials.

• Autor(a) principal: Firoozmand, Leily M
• Data de Publicação: 2009
• Outros Autores: Pagani, Clóvis
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.actaodontologicalat.com/archivo/v22n2/fulltext/articulo1.pdf; http://www.actaodontologicalat.com/archivo/v23n2/articulo1.pdf; http://hdl.handle.net/11449/71416
• topic: compomer; Esthet X; Esthet-X; Freedom Compomer; glass ionomer; resin; Vitremer; dental bonding; dental care; dental surgery; materials testing; Compomers; Composite Resins; Dental Bonding; Dental Restoration, Permanent; Glass Ionomer Cements; Materials Testing; Tooth Bleaching

The aim of this study is to evaluate the flexural resistance of three types of restorative materials: compomer (Freedom), resin-modified glass-ionomer (Vitremer) and composite resin (Esthet-X), observing whether the application of bleaching agent can cause alterations of their flexural properties. Sixty samples were made using a 10 x 1 x 1 mm brass mold, and divided into three groups: G1- Freedom (SDI); G2- Vitremer (3M ESPE); G3- Esthet-X (Dentsply). On half of the samples of each group (10 samples) the bleaching treatment was applied and the other half used as control, was stored in distilled water at a temperature of 37 degrees C. Whiteness HP Maxx bleaching system was applied on the sample surface following the manufacturer's recommendations, simulating the bleaching treatment at the clinic. After this period, a flexural strength (three-point bending) test was conducted using (EMIC DL 1000) machine until the samples fractured. The data were submitted to ANOVA and Tukey tests. Of the restorative materials studied, G3-(87.24 +/- 31.40 MPa) presented the highest flexural strength, followed by G1-(61.67 +/- 21.32 MPa) and G2-(61.67 +/- 21.32 MPa). There was a statistical difference in flexural strength after the bleaching treatment. It was concluded that the use of a beaching agent can promote significant alteration of the flexural strength of these restorative materials.