EFEITO DO TRATAMENTO DE SUPERFÍCIE DE UMA CERÂMICA ALUMINIZADA INFILTRADA DE VIDRO SOBRE A RESISTÊNCIA À

ABSTRACT This study evaluated the microtensile bond strength of aresin composite to a ceramic submitted to three surfacetreatments. Twelve glass-infiltrated alumina ceramic blocks(In-Ceram Alumina, VITA) and twelve resin compositeblocks (Clearfil APX, Kuraray) with dimensions of 6mm x6mm x 5mm were made. The surface of the ceramic waswet-grounded with # 600, 800 and 1200-grid sandpaper,and the blocks were divided in three groups: Group 1 –sandblasting with aluminum oxide – particles 110µm(Micro-Etcher, Danville); Group 2 – Rocatec System(ESPE): Tribochemical silica coating (Rocatec pre-powder+ Rocatec-Plus powder + Rocatec-Sil); Group 3 – CoJetSystem (3M/ESPE): silica coating (silica oxide + ESPE-Sil). The ceramic blocks were cemented to the resincomposite blocks with Panavia F (Kuraray Co), followingthe manufacturer’s instructions, under load of 750g for10min. The samples were stored (distilled water / 7 days /37 O C) and sectioned in two axis, x and y, with diamond diskunder cooling in order to obtain samples (S) with 0.6 ±0.1mm² of adhesive area (n=36). The S were attached inadapted device for the microtensile test that was performedat an universal testing machine (EMIC), at a speed of 1mm/min. The results (MPa) were submitted to ANOVA andTukey’s test (p<0.05): G1 – 15.36; G2 – 30.98; G3 – 31.25.Groups 2 (Rocatec) and 3 (CoJet) presented larger bondstrength than group 1. There was no statistical differencebetween group 2 and group 3.