title: Four-year clinical evaluation of Class II nano-hybrid resin composite restorations bonded with a one-step self-etch and a two-step etch-and-rinse adhesive.
authors.affiliation: Dental School, Faculty of Medicine, Umeå University, Umeå, Sweden. jan.van.dijken@odont.umu.se
authors.forename: Jan W V
authors.initials: JW
authors.lastname: van Dijken
authors.forename: Ulla
authors.initials: U
authors.lastname: Pallesen