Resumo

WINCKLER, Luiz Fernando; OLIVIERI, Karina Andrea Novaes  e  MIRANDA, Milton Edson. Shear bond strength of a feldspathic ceramic cemented to a composite resin. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.3, pp. 369-374. ISSN 1981-8637.

Objective To evaluate the shear bond strength of a feldspathic ceramic cemented to a composite resin using a resin-based cement, following different treatments to the ceramic surface. Methods 30 ceramic samples were prepared and divided into 3 groups according to surface treatment: group 1 - control, group 2 - 10% hydrofluoric acid etching for 2 minutes, rinsing under running water and air-drying, group 3 - 10% hydrofluoric acid for 2 minutes, rinsing under running water, air-drying followed by silane. Subsequently, composite resin discs were cemented onto the ceramic specimens using a resin cement and light-curing for 40 seconds. Shear bond strength test was performed on an Emic DL2000 testing machine. Results Statistical analysis revealed the following results: there was a significant increase in bond strength in the group etched with hydrofluoric acid when compared with the control, whilst no significance was found in the group treated with silane after etching. Conclusion The assessment of failure types under light microscopy revealed a predominance of adhesive failures in the control group and cohesive failures in the remaining groups.

Palavras-chave : Composite resins; Dental porcelain; Resin cements; Shear strength.