title: Use of a self-etching primer in combination with a resin-modified glass ionomer: effect of water and saliva contamination on shear bond strength.
abstract: The purpose of this study was to evaluate the effects of 3 different enamel conditioners (10% polyacrylic acid, 37% phosphoric acid, and self-etching primer) on the shear bond strength and site of bond failure of a resin-modified glass ionomer (Fuji Ortho LC, GC Europe, Leuven, Belgium) bonded onto dry, water-moistened, and saliva-moistened enamel. One hundred eighty bovine permanent mandibular incisors were randomly divided into 12 groups; each group consisted of 15 specimens. Three different enamel surface conditions were studied: dry, soaked with water, soaked with saliva. One hundred eighty stainless steel brackets were bonded with the resin-modified glass ionomer. After bonding, all samples were stored in distilled water for 24 hours and then tested in a shear mode on a testing machine. After self-etching primer application, Fuji Ortho LC produced the highest shear bond strengths under all the different enamel surface conditions; these values were significantly higher than those achieved in the remaining groups, except when Fuji Ortho LC was used in combination with 37% phosphoric acid on dry enamel. Fuji Ortho LC bonded without enamel conditioning produced the lowest shear bond strengths. The bond strength of the groups conditioned with 10% polyacrylic acid was significantly lower than that of the groups etched with 37% phosphoric acid, except when both conditioners were used on enamel soaked with water.
authors.affiliation: Department of Orthodontics, University of Pavia, Italy. vcacciafesta@hotmail.com
authors.forename: Vittorio
authors.initials: V
authors.lastname: Cacciafesta
authors.forename: Maria Francesca
authors.initials: MF
authors.lastname: Sfondrini
authors.forename: Lucia
authors.initials: L
authors.lastname: Baluga
authors.forename: Andrea
authors.initials: A
authors.lastname: Scribante
authors.forename: Catherine
authors.initials: C
authors.lastname: Klersy
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins; D000538:Aluminum Silicates; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D008422:Materials Testing; D016910:Orthodontic Brackets; D010756:Phosphoric Acids; D011336:Probability; D019279:Resin Cements; D012463:Saliva; D033081:Shear Strength; D014867:Water
chemical_list: D000180:Acrylic Resins; D000538:Aluminum Silicates; C095451:Fuji Ortho LC; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; D014867:Water; C006903:carbopol 940; C030242:phosphoric acid