title: Durability of enamel bonding using two-step self-etch systems on ground and unground enamel.
abstract: This study examined the early and long-term microtensile bond strengths (MTBS) and interfacial enamel gap formation (IGW) of two-step self-etch systems to unground and ground enamel. Resin composite (Filtek Z250) buildups were bonded to proximal enamel surfaces (unground, bur-cut or SiC-treated enamel) of third molars after the application of four self-etch adhesives: a mild (Clearfil SE Bond [SE]), two moderate (Optibond Solo Plus Self-Etch Primer [SO] and AdheSE [AD]) and a strong adhesive (Tyrian Self Priming Etchant + One Step Plus [TY]) and two etch-and-rinse adhesive systems (Single Bond [SB] and Scotchbond Multi-Purpose Plus [SBMP]). Ten tooth halves were assigned for each adhesive. After storage in water (24 hours/37 degrees C), the bonded specimens were sectioned into beams (0.9 mm2) and subjected to microTBS (0.5 mm/minute) or interfacial gap width measurement (stereomicroscope at 400x) either immediately (IM) or after 12 months (12M) of water storage. The data were analyzed by three-way repeated measures ANOVA and Tukey's test (alpha=0.05). No gap formation was observed in any experimental condition. The microTBS in the Si-C paper and diamond bur groups were similar and greater than the unground group only for the moderate self-etch systems (SO and AD). No reductions in bond strength values were observed after 12 months of water storage, regardless of the adhesive evaluated.
authors.affiliation: Department of Operative Dentistry and Dental Materials, School of Dentistry, University of Oeste de Santa Catarina, Joaçaba/SC, Brazil. aloguercio@hotmail.com
authors.forename: Alessandro Dourado
authors.initials: AD
authors.lastname: Loguercio
authors.forename: Sandra Kiss
authors.initials: SK
authors.lastname: Moura
authors.forename: Arlete
authors.initials: A
authors.lastname: Pellizzaro
authors.forename: Karen
authors.initials: K
authors.lastname: Dal-Bianco
authors.forename: Rafael Tiago
authors.initials: RT
authors.lastname: Patzlaff
authors.forename: Rosa Helena Miranda
authors.initials: RH
authors.lastname: Grande
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D001840:Dental Bonding; D003743:Dental Enamel; D018772:Dental Marginal Adaptation; D003799:Dental Stress Analysis; D004356:Drug Storage; D006801:Humans; D008963:Molar; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D014867:Water
chemical_list: D019279:Resin Cements; D014867:Water