Bond strength of self-adhesive resin cements to composite submitted to different surface pretreatments
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Objectives: Extensively destroyed teeth are commonly restored with composite resinbefore cavity preparation for indirect restorations. The longevity of the restorationcan be related to the proper bonding of the resin cement to the composite. This studyaimed to evaluate the microshear bond strength of two self-adhesive resin cements tocomposite resin. Material and Methods: Composite discs were subject to one of sixdifferent surface pretreatments: none (control), 35% phosphoric acid etching for 30seconds (PA), application of silane (silane), PA + silane, PA + adhesive, or PA + silane+ adhesive (n = 6). A silicone mold containing a cylindrical orifice (1 mm2 diameter)was placed over the composite resin. RelyX Unicem (3M ESPE) or BisCem (Bisco Inc.)self-adhesive resin cement was inserted into the orifices and light-cured. Self-adhesivecement cylinders were submitted to shear loading. Data were analyzed by two-wayANOVA and Tukey’s test (p < 0.05). Results: Independent of the cement used, the PA+ Silane + Adhesive group showed higher microshear bond strength than those ofthe PA and PA + Silane groups. There was no difference among the other treatments. Unicem presented higher bond strength than BisCem for all experimental conditions. Conclusions: Pretreatments of the composite resin surface might have an effect onthe bond strength of self-adhesive resin cements to this substrate.
Abstract
Objectives: Extensively destroyed teeth are commonly restored with composite resinbefore cavity preparation for indirect restorations. The longevity of the restorationcan be related to the proper bonding of the resin cement to the composite. This studyaimed to evaluate the microshear bond strength of two self-adhesive resin cements tocomposite resin. Material and Methods: Composite discs were subject to one of sixdifferent surface pretreatments: none (control), 35% phosphoric acid etching for 30seconds (PA), application of silane (silane), PA + silane, PA + adhesive, or PA + silane+ adhesive (n = 6). A silicone mold containing a cylindrical orifice (1 mm2 diameter)was placed over the composite resin. RelyX Unicem (3M ESPE) or BisCem (Bisco Inc.)self-adhesive resin cement was inserted into the orifices and light-cured. Self-adhesivecement cylinders were submitted to shear loading. Data were analyzed by two-wayANOVA and Tukey’s test (p < 0.05). Results: Independent of the cement used, the PA+ Silane + Adhesive group showed higher microshear bond strength than those ofthe PA and PA + Silane groups. There was no difference among the other treatments. Unicem presented higher bond strength than BisCem for all experimental conditions. Conclusions: Pretreatments of the composite resin surface might have an effect onthe bond strength of self-adhesive resin cements to this substrate.
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