title: Effect of oxygen inhibition in two-step self-etch systems on surface free energy and dentin bond strength with a chemically cured resin composite.
abstract: We compared the surface free energies and dentin bond strengths of two-step self-etch systems with and without an oxygen-inhibited layer. The adhesives were applied to self-etching primer-treated dentin surfaces of bovine incisors, after which the teeth were light-irradiated and the oxygen-inhibited layer was left intact or removed with ethanol. We determined surface free energies (γS) and their components by measuring the contact angles of three test liquids placed on the cured adhesives. We also measured the dentin bond strengths of chemically cured resin composite to the adhesives, with and without the oxygen-inhibited layer. For all surfaces, the estimated surface tension component, γS(LW), was relatively constant. The Lewis base (γS(-)) component decreased significantly when the oxygen-inhibited layer was removed, whereas the Lewis acid (γS(+)) component slightly increased. The dentin bond strengths of the two-step self-etch systems did not significantly differ in relation to the presence of the oxygen-inhibited layer. Although the surface free energy of the adhesive was affected by the presence of the oxygen-inhibited layer, no changes in dentin bond strength were detected.
authors.affiliation: Department of Operative Dentistry, Nihon University School of Dentistry.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Yamaji
authors.forename: Akimasa
authors.initials: A
authors.lastname: Tsujimoto
authors.forename: Tetsui
authors.initials: T
authors.lastname: Asaoka
authors.forename: Saki
authors.initials: S
authors.lastname: Matsuyoshi
authors.forename: Kenji
authors.initials: K
authors.lastname: Tsuchiya
authors.forename: Toshiki
authors.initials: T
authors.lastname: Takamizawa
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D045662:Dental Etching; D003804:Dentin; D008855:Microscopy, Electron, Scanning; D010100:Oxygen / Q000378:metabolism*
chemical_list: D003188:Composite Resins; D010100:Oxygen