title: Shear bond strength of metallic orthodontic brackets bonded to enamel prepared with Self-Etching Primer.
abstract: The aim of this study was to determine the shear bond strength of different composites and to determine the adhesive remnant index (ARI) of metallic brackets bonded to enamel prepared with Transbond Plus Self-Etching Primer (TPSEP). Forty human premolars were divided into four equal groups. In group 1 (control), the Transbond XT was conventionally used. In groups 2-4, the TPSEP was used before bonding with Transbond XT, Z-100, and Concise Orthodontic, respectively. After the bonding, the samples were stored in distilled water at 37 degrees C for 24 hours. The brackets were debonded using a universal testing machine at a crosshead speed of 0.5 mm/ min. The shear bond strength (MPa) for group 1 (control), group 2 (TPSEP + Transbond XT), group 3 (TPSEP + Z-100), and group 4 (TPSEP + Concise Orthodontic) were of 6.43, 4.61, 4.74, and 0.02, respectively. Group 1 was statistically superior to other groups (P < .05), but there was no statistically significant difference between groups 2 and 3 (P > .05), although both were statistically superior to group 4 (P < .05). According to the ARI evaluation, most of the failures involved the bracket/composite interface (groups 1 and 2) as well as the enamel/composite interface (groups 3 and 4). The Transbond XT conventionally bonded showed better adhesion results than Transbond XT, Z-100, and Concise Orthodontic after using Transbond Plus Self-Etching Primer.
authors.affiliation: Piracicaba Dental School-UNICAMP, Ribeirão Preto, São Paulo, Brazil. flromano@aol.com
authors.forename: Fábio Lourenço
authors.initials: FL
authors.lastname: Romano
authors.forename: Stenyo Wanderley
authors.initials: SW
authors.lastname: Tavares
authors.forename: Darcy Flávio
authors.initials: DF
authors.lastname: Nouer
authors.forename: Simonides
authors.initials: S
authors.lastname: Consani
authors.forename: Maria Beatriz
authors.initials: MB
authors.lastname: Borges de Araújo Magnani
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D003722:Dental Alloys; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D012822:Silicon Dioxide; D015040:Zirconium
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT; C083568:Z100 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium