Durability of enamel bonding using two-step self-etch systems on ground and unground enamel.
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.
Loguercio
Alessandro Dourado
AD
Department of Operative Dentistry and Dental Materials, School of Dentistry, University of Oeste de Santa Catarina, Joaçaba/SC, Brazil. aloguercio@hotmail.com
Moura
Sandra Kiss
SK
Pellizzaro
Arlete
A
Dal-Bianco
Karen
K
Patzlaff
Rafael Tiago
RT
Grande
Rosa Helena Miranda
RH
Reis
Alessandra
A
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
D019279:Resin Cements; D014867:Water