34591
document
Microtensile bond strength of a repair composite to leucite-reinforced feldspathic ceramic . The purpose of this study was to evaluate the microtensile bond strength of a repair composite resin to a leucite-reinforced feldspathic ceramic ( Omega 900 , VITA ) submitted to two surface conditionings methods : 1 ) etching with hydrofluoric acid + silane application or 2 ) tribochemical silica coating . The null hypothesis is that both surface treatments can generate similar bond strengths . Ten ceramic blocks ( 6x6x6 mm ) were fabricated and randomly assigned to 2 groups ( n=5 ) , according to the conditioning method : G1- 10 % hydrofluoric acid application for 2 min plus rinsing and drying , followed by silane application for 30 s ; G2- airborne particle abrasion with 30 microm silica oxide particles ( CoJet-Sand ) for 20 s using a chairside air-abrasion device ( CoJet System ) , followed by silane application for 5 min . Single Bond adhesive system was applied to the surfaces and light cured ( 40 s ) . Z-250 composite resin was placed incrementally on the treated ceramic surface to build a 6x6x6 mm block . Bar specimens with an adhesive area of approximately 1 +/- 0.1 mm ( 2 ) were obtained from the composite-ceramic blocks ( 6 per block and 30 per group ) for microtensile testing . No statistically significant difference was observed between G1 ( 10.19 +/- 3.1 MPa ) and G2 ( 10.17 +/- 3.1 MPa ) ( p=0.982 ) ( Student 's t test ; á = 0.05 ) . The null hypothesis was , therefore , accepted . In conclusion , both surface conditioning methods provided similar microtensile bond strengths between the repair composite resin and the ceramic . Further studies using long-term aging procedures should be conducted .
34592
Intervention_Pharmacological
etching with hydrofluoric acid + silane application
34593
Intervention_Pharmacological
tribochemical silica coating
34594
Intervention_Pharmacological
hydrofluoric acid
34595
Intervention_Pharmacological
silane
34596
Outcome_Other
bond strengths
34597
Outcome_Other
microtensile testing
34598
Participant_Sample-size
Ten ceramic blocks ( 6x6x6 mm ) were fabricated and randomly assigned to 2 groups ( n=5 ) , according to the conditioning method : G1- 10 % hydrofluoric acid application for 2 min plus rinsing and drying , followed by silane application for 30