title: Role of preliminary etching for one-step self-etch adhesives.
abstract: The aim of this study was to analyse the effect of preliminary phosphoric acid etching of enamel and dentine before the application of two, one-step self-etch adhesive systems. The systems were applied onto acid-etched or smear-layer-covered enamel and dentine. The treatment groups were as follows: group 1, Adper Easy Bond (3M ESPE) on etched substrate; group 2, Adper Easy Bond (control); group 3, iBond Self-Etch (Heraeus Kulzer) on etched substrate; and group 4, iBond Self-Etch (control). Enamel and dentine bond strengths were calculated using microshear and microtensile bond-strength tests. Additional specimens were prepared to evaluate nanoleakage at the dentine-adhesive interface and were investigated using light microscopy or transmission electron microscopy. Both adhesives demonstrated higher microshear bond strengths when enamel was pre-acid-etched with phosphoric acid (Adper Easy Bond 28.7 ± 4.8 MPa; iBond Self-Etch 19.7 ± 3.6 MPa) compared with controls (Adper Easy Bond 19.2 ± 3.3 MPa; iBond Self-Etch 17.5 ± 2.7 MPa) and increased microtensile bond strength when applied on acid-etched (Adper Easy Bond 35.8 ± 5.7 MPa; iBond Self-Etch 24.3 ± 7.9 MPa) vs. smear-layer-covered dentine (Adper Easy Bond 26.9 ± 6.2 MPa; iBond Self-Etch 17.6 ± 4.3 MPa). Adper Easy Bond showed lower nanoleakage than iBond Self-Etch, irrespective of preliminary etching. The results of this study support the use of phosphoric acid etching before the application of one-step self-etch adhesive systems.
authors.affiliation: Dental Clinic 1 - Operative Dentistry and Periodontology, University of Erlangen, Erlangen, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Taschner
authors.forename: Fernando
authors.initials: F
authors.lastname: Nato
authors.forename: Annalisa
authors.initials: A
authors.lastname: Mazzoni
authors.forename: Roland
authors.initials: R
authors.lastname: Frankenberger
authors.forename: Norbert
authors.initials: N
authors.lastname: Krämer
authors.forename: Roberto
authors.initials: R
authors.lastname: Di Lenarda
authors.forename: Anselm
authors.initials: A
authors.lastname: Petschelt
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Breschi
mesh_terms: D000134:Acid Etching, Dental; D016009:Chi-Square Distribution; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects; D003763:Dental Leakage; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects; D006801:Humans; D010756:Phosphoric Acids / Q000494:pharmacology; D019279:Resin Cements; D033081:Shear Strength; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D010756:Phosphoric Acids; D019279:Resin Cements; C030242:phosphoric acid