title: Effect of smear layer characteristics on dentin bonding durability of HEMA-free and HEMA-containing one-step self-etch adhesives.
abstract: The purpose of this study was to evaluate the effect of smear layer characteristics on the dentin bonding durability of HEMA-free and HEMA-containing one-step self-etch adhesives. Xeno V (XV; HEMA-free), G BOND PLUS (GB; HEMA-free) and Clearfil S(3 )Bond (S(3); HEMA-containing), were applied to dentin surfaces prepared with either #180- or #600-grit SiC paper according to manufacturers' instructions. Bond strengths to dentin were determined using µTBS test after 24-hour, 6-month, and 1-year water storage. In addition, nanoleakage evaluation was performed using an SEM. The smear layer characteristics affected water-tree nanoleakage formation in the adhesive layers of XV and GB, which contributed to a reduction in µTBS after 6-month water storage, while the characteristics did not affect the µTBS of S(3). However, regardless of the smear layer characteristics, 1-year water storage significantly reduced the µTBS of all the adhesives and was associated with an increase in failures at the adhesive-composite interface.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Shinoda
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Nakajima
authors.forename: Keiichi
authors.initials: K
authors.lastname: Hosaka
authors.forename: Masayuki
authors.initials: M
authors.lastname: Otsuki
authors.forename: Richard M
authors.initials: RM
authors.lastname: Foxton
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000268:Adhesiveness; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D016369:Smear Layer; D013314:Stress, Mechanical; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D017554:Carbon Compounds, Inorganic; C505694:Clearfil S3 Bond; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements; D017655:Silicon Compounds; C487957:Xeno III; D014867:Water; C005044:hydroxyethyl methacrylate; C022088:silicon carbide