OBJECTIVES: This study evaluated the adhesion of self-adhesive resin cement to zirconia after various surface conditioning methods in non-aged and aged conditions. METHODS: Zirconia ( @entity3465 e.max ZirCAD, Ivoclar Vivadent) and resin composite blocks were obtained and randomly divided into four groups according to one of the following surface conditioning methods: C: No surface treatment (Control); @entity5427 : Air abrasion (50     m @entity16773 ) at low pressure (0.2   MPa) plus @entity12138 (Monobond Plus, Ivoclar Vivadent); MC: @entity1044 for 60 min; CE: Chemical etching solution at 100  C for 60 min. Surface roughness (Ra) measurements were performed on the control and conditioned zirconia specimens using a profilometer. Each conditioned zirconia block was bonded to its corresponding resin composite block using self-adhesive resin cement (RelyX Unicem Aplicap, 3M ESPE) under a load of 300   g. Half of the groups were tested without aging; the other half were tested after x6000 thermocycling. Sticks were obtained from bonded specimens and subjected to microtensile bond strength (MTBS) testing in a universal testing machine (0.5   mm/min). Failure types were classified after debonding. Data (MPa) were analyzed using two-way ANOVA and Tukey's tests (a   =   0.05). RESULTS: The highest mean Ra value was obtained in Group CE (0.52     m), and the lowest in Group C (0.25     m). Significantly lower MTBS test results were obtained in Group C, both in non-aged (17.4        1.1   MPa) and aged (5.11        0.5   MPa) conditions than in the other groups (34.6    1.5 to 51.2    1.1      MPa; 28.0    0.9 to 49.5    1.0 MPa in non-aged and aged conditions, respectively) (P   <   0.05). Group CE presented the highest MTBS test results in both non-aged and aged conditions (51.2        1.1   MPa and 49.5        1   MPa, respectively) (P   <   0.05). Failure types were predominantly adhesive in all groups before and after aging. After aging, less adhesive and more mixed and cohesive failures in cement were observed in Groups @entity5427 and CE than in the other groups. CONCLUSION: Chemical etching of @entity10678 may have potential use as a substitute for air abrasion as a surface conditioning method for zirconia.

Effect of chemical etching solutions versus air abrasion on the adhesion of self-adhesive resin cement    to XXXX e.max ZirCAD with and    without aging.

@entity16773 :: ('CHEBI:30192', 'Chemical') :: ['Al2O3'] @entity5427 :: ('MESH:D017204', 'Disease') :: ['AS'] @entity1044 :: ('MESH:D008752', 'Chemical') :: ['Methylene chloride'] @entity3465 :: ('MESH:C536271', 'Disease') :: ['IPS'] @entity10678 :: ('MESH:C028541', 'Chemical') :: ['zirconia'] @entity12138 :: ('CHEBI:29389', 'Chemical') :: ['silane']
@entity3465 :: (MESH:C536271,Disease) :: ['IPS']
