Noninvasive pit and fissure sealing: microtensile bond strength to intact bovine enamel of different pit and fissure sealants in a simplified fissure model.

摘要: Purpose To measure the microtensile bond strength of different pit and fissure sealants in a simplified model. Materials methods Twenty extracted bovine mandibular permanent incisors were randomly divided into 4 groups for treatment: G1: 35% phosphoric acid/Clinpro Sealant; G2: acid/Delton; G3: Non-Rinse Conditioner/Dyract Seal; G4: 20% polyacrylic acid/Fuji IILC. Each tooth was sectioned 6 pieces (4 x mm) buccal enamel. SEM examination used to confirm presence aprismatic enamel on each tooth. Using spacer, two etched secured glass slide at mean distance 0.6+/-0.1 mm. The space between substrates then etched/conditioned sealed with materials according tested groups. By serially cutting double-bonded sample, multiple beam-shaped specimens about 0.8mm(2) cross section obtained tension (0.5 mm/min) until failure occurred either one stressed interfaces. Failure modes classified by stereomicroscopy. Results G1 G2 showed statistically higher strengths than G3 G4. G4 demonstrated significantly lowest strength. Failures mostly adhesive G1, G2, G3, mainly cohesive/mixed Conclusion According this model, resin-based (Clinpro Sealant, Delton) better compomer (Dyract Seal) or resin-modified ionomer (Fuji IILC).