title: Shear bond strength and ultrastructural interface analysis of different adhesive systems to Er:YAG laser-prepared dentin.
abstract: The aim of this study was to evaluate the shear bond strength (SBS) of a microhybrid composite resin bonded with three different adhesive systems to Er:YAG laser- (EL) or bur-prepared dentin surfaces and to analyze the quality and ultrastructure of the adhesive-dentin interfaces by scanning electron microscopy (SEM). The specimens prepared for SBS test and SEM analysis were randomly assigned to eight groups (G1-G8): G1, EL (Fidelis PlusIII, Fotona) + Clearfil S3 Bond (C3S); G2, EL + AdperSE Plus (SE); G3, EL + laser etch + Adper Single Bond2 (SB2); G4, EL + acid etch + SB2; G5, EL + SB2 (no etching); G6, bur + acid etch + SB2; G7, bur + S3; G8, bur + SE. Laser was used in very short pulse mode at a setting of 200 mJ/20 Hz for dentin preparation and at 80 mJ/10 Hz for dentin etching. Bond strength test: 3.5 × 2.0 mm cylindrical molds were placed onto adhesives and filled with the composites. After 24 h in distilled water, SBS was tested at a crosshead speed of 0.5 mm/min. SEM analysis: The dentin-adhesive interfaces were evaluated for the ultrastructure of hybrid layer. Data of SBS (MPa) were statistically analyzed by ANOVA and Tukey HSD. ER:YAG laser-prepared dentin has demonstrated significantly more SBS (p < 0.01) for SE when compared to bur-prepared dentin. No significancies (p > 0.05) in SBS have been determined between the total-etch adhesive applied groups with regard to etching types. SEM analysis revealed that hybrid layers obtained in Er:YAG laser-irradiated dentin exhibited more irregular and non-homogeneous pattern than the conventionally prepared dentin. In conclusion, SE Bond demonstrated superior results in Er:YAG laser-ablated dentin compared to bur-prepared dentin.
authors: Department of Pedodontics, Faculty of Dentistry, Istanbul University, Çapa, Istanbul, 34093, Turkey, yelizgn@yahoo.com.
authors: Yeliz
authors: Y
authors: Guven
authors: Oya
authors: O
authors: Aktoren
mesh_terms: D003188:Composite Resins / Q000494:pharmacology; D001840:Dental Bonding; D003738:Dental Cements / Q000494:pharmacology*; D003804:Dentin / Q000187:drug effects* / Q000528:radiation effects / Q000648:ultrastructure*; D006801:Humans; D053844:Lasers, Solid-State; D008422:Materials Testing / Q000379:methods*; D033081:Shear Strength / Q000187:drug effects*
chemical_list: D003188:Composite Resins; D003738:Dental Cements
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