title: Shear bond strength of enamel surface treated with air-abrasive system.
abstract: The aim of this study was to evaluate the shear bond strength of a composite resin to dental enamel, using three different surface treatments. Fifteen sound third molars were randomly assigned to three groups. The mesial and distal surfaces were flattened and covered using adhesive tape with a central orifice delimiting the adhesion area (7.07 mm2). Group I, the enamel surface was conditioned with 37% phosphoric acid for 15 s; group II, the surface was treated using air abrasion with aluminum oxide; group III, the enamel surface was treated using an association of air abrasion with aluminum oxide and 37% phosphoric acid. The Single Bond (3M) adhesive system was applied and a Teflon matrix was placed and filled with composite resin Z-100 (3M) and light-cured. The shear bond strength test was performed with a universal testing machine. The acid etching technique and air abrasion with aluminum oxide associated with acid etching had the highest shear bond strength values. Data were subjected to statistical analysis using ANOVA and the Turkey test, and no statistically significant difference in shear bond strength was observed between group I (12.49 +/- 2.85 MPa) and group III (12.59 +/- 2.68 MPa). In contrast, both groups had statistically better shear bond strengths compared to group II (0.29 +/- 0.56 MPa; p < 0.05). Air abrasion with aluminum oxide does not substitute acid etching. The association of these methods to obtain adequate adhesion to the substrate is necessary.
authors.affiliation: Department of Clinical Pediatrics, Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil. borsatto@forp.usp.br
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
authors.forename: Alma Blásida Elisaur Benitez
authors.initials: AB
authors.lastname: Catirse
authors.forename: Regina Guenka
authors.initials: RG
authors.lastname: Palma Dibb
authors.forename: Telma Nunes do
authors.initials: TN
authors.lastname: Nascimento
authors.forename: Renata Andréa Salvitti de Sá
authors.initials: RA
authors.lastname: Rocha
authors.forename: Silmara Aparecida Milori
authors.initials: SA
authors.lastname: Corona
mesh_terms: D000134:Acid Etching, Dental; D020906:Air Abrasion, Dental; D000537:Aluminum Oxide; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000502:physiology*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008963:Molar; D010756:Phosphoric Acids; D011897:Random Allocation; D019279:Resin Cements; D033081:Shear Strength; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D013499:Surface Properties; D015040:Zirconium
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D019279:Resin Cements; C083568:Z100 composite resin; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium; C030242:phosphoric acid; D000537:Aluminum Oxide