title: Effect of smear layer treatment on dentin bond of self-adhesive cements.
abstract: The purpose of this study was to compare the dentin bond strength of three self-adhesive cements with smear layer pretreatments using a calcium-chelating agent (EDTA) and deproteinizing solution (NaOCl) and to evaluate their interfacial characteristics. Smear layer-covered dentin surfaces were pretreated with EDTA for 60 s, NaOCl for 5 and 15 s, or none. Three self-adhesive cements; Clearfil SA luting (Kuraray Medical), Rely X Unicem clicker (3M ESPE) and Breeze (Pentron) were applied to the dentin surfaces. After 24-h water storage, shear bond strengths to dentin were determined. In addition, nanoleakage evaluation at the interface was performed using FE-SEM and EDS. EDTA-pretreatment significantly improved the bond strength of BR (p<0.05) and NaOCl-pretreatment for 15 s significantly improved the bond strength of RX (p<0.05). On the other hand, for SA, both pretreatments significantly decreased bond strength to dentin (p<0.05). Nanoleakage formation was observed in various amounts at the cement-dentin interfaces.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kambara
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Nakajima
authors.forename: Keiichi
authors.initials: K
authors.lastname: Hosaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takahashi
authors.forename: Ornnicha
authors.initials: O
authors.lastname: Thanatvarakorn
authors.forename: Shizuko
authors.initials: S
authors.lastname: Ichinose
authors.forename: Richard M
authors.initials: RM
authors.lastname: Foxton
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004492:Edetic Acid; D006801:Humans; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D016369:Smear Layer; D012973:Sodium Hypochlorite
chemical_list: C581302:Clearfil SA; D017220:Dentin-Bonding Agents; C483701:Rely X Unicem; D019279:Resin Cements; C584659:breeze cement; D004492:Edetic Acid; D012973:Sodium Hypochlorite