Please use this identifier to cite or link to this item: http://www.repositorio.ufc.br/handle/riufc/6397
Title in Portuguese: Effect of surface pretreatments on the microtensile bond strength of lithium-disilicate ceramic repaired with composite resin
Author: Colares, Regina Cláudia Ramos
Neri, Jiovanne Rabelo
Souza, André Mattos Brito de
Pontes, Karina Matthes de Freitas
Mendonça, Juliano Sartori
Santiago, Sérgio Lima
Keywords: Ácido Fluorídrico
Lítio
Issue Date: Jul-2013
Publisher: Brazilian Dental Journal
Citation: COLARES, R. C. R. et al. Effect of surface pretreatments on the microtensile bond strength of lithium-disilicate ceramic repaired with composite resin. Brazilian Dental Journal, Ribeirao Preto, SP, v. 24, n. 4, p. 349-352, jul. 2013.
Abstract: The aim of this study was to evaluate the influence of ceramic surface treatments and silane drying temperature on the microtensile bond strength (μTBS) of a resin composite to a lithium disilicate ceramic. Twenty blocks (7x7x5 mm) of lithium disilicate-based hotpressed ceramic were fabricated and randomly divided into 4 groups: G1: acid etching with 9.5% hydrofluoric acid for 20 s and drying silane with room-temperature air; G2: acid etching with 9.5% hydrofluoric acid for 20 s and drying silane with 45 ± 5 °C warm air; G3: airborne-particle abrasion with 50 μm aluminum oxide particles and drying silane with 45 ± 5 °C warm air; G4: airborne-particle abrasion with 50 μm aluminum oxide particles and drying silane with air at room-temperature. After treatments, an adhesive system (Single Bond 2) was applied, light-cured and direct restorations were built up with a resin composite (Filtek Z250). Each specimen was stored in distilled water at 37 °C for 24 h and cut into ceramic-composite beams with 1 mm2 of cross-sectional area for μTBS testing. Statistical analysis was performed with one-way ANOVA and Student- Newman-Keuls test (α=0.05). μTBS means (S.D.) in MPa were: G1: 32.14 (7.98), G2: 35.00 (7.77) and G3: 18.36 (6.17). All specimens of G4 failed during the cutting. G1 and G2 presented significantly higher μTBS than G3 (p<0.05). There was no statistically significant difference between G1 and G2 (p>0.05). As far as the bond strength is concerned, surface pretreatment of lithium-disilicate ceramic with hydrofluoric acid and silane application can be used as an alternative to repair ceramic restorations with composite resin, while surface pretreatment with sandblasting should be avoided.
URI: http://www.repositorio.ufc.br/handle/riufc/6397
metadata.dc.type: Artigo
ISSN: 0103-6440
Appears in Collections:DCOD - Artigos publicados em revistas científicas

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