title: Influence of Light Source, Thermocycling and Silane on the Shear Bond Strength of Metallic Brackets to Ceramic.
abstract: The objective of this study was to evaluate the effects of different light sources, thermocycling and silane on the bond strength of metallic brackets to ceramic. Cylinders of feldspathic ceramic were etched with 10% hydrofluoric acid for 60 s. Half of the cylinders (Groups 1 to 4) received two layers of silane. Metallic brackets were bonded to the cylinders using Transbond XT and divided into 8 groups (n=20), according to light source (Radii Plus LED - 40 s; Groups 1, 2, 5 and 6 and XL 2500 halogen light - 40 s; Groups 3, 4, 7 and 8) and experimental conditions with (Groups 2, 4, 6 and 8) without thermocycling (Groups 1, 3, 5 and 7). Shear bond testing was carried out after 24 h of deionized water storage (Groups 1, 3, 5 and 7) and thermocycling (Groups 2, 4, 6 and 8; 7,000 cycles - 5°/55 °C). Date were submitted to three-way ANOVA and Tukey's post hoc test (α=0.05). The Adhesive Remnamt Index (ARI) was evaluated at 8× magnification. The application of silane was effective in increasing the shear bond strength of the brackets to ceramic (p<0.05). Significant difference (p<0.05) on the bond strength was observed between light sources with or without thermocycling. The ARI showed a predominance of scores 0 for all groups, with an increase in scores 1, 2 and 3 for the silane groups. In conclusion, silane improved significantly the shear bond strength of the brackets to ceramic. The thermocycling and light sources influence on the bond strength.
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - Universidade de Araras, Araras, SP, Brazil.
authors.forename: Hugo Franco
authors.initials: HF
authors.lastname: De Abreu Neto
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Ana Rosa
authors.initials: AR
authors.lastname: Costa
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Américo Bortolazzo
authors.initials: AB
authors.lastname: Correr
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - Universidade de Araras, Araras, SP, Brazil.
authors.forename: Silvia Amélia
authors.initials: SA
authors.lastname: Vedovello
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - Universidade de Araras, Araras, SP, Brazil.
authors.forename: Heloísa Cristina
authors.initials: HC
authors.lastname: Valdrighi
authors.affiliation: Department of Pediatric Dentistry, Orthodontic Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Eduardo Cesar Almada
authors.initials: EC
authors.lastname: Santos
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Lourenço
authors.initials: L
authors.lastname: Correr-Sobrinho
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - Universidade de Araras, Araras, SP, Brazil.
authors.forename: Mário
authors.initials: M
authors.lastname: Vedovello Filho
mesh_terms: D002516:Ceramics; D008670:Metals; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry*
chemical_list: D008670:Metals; D012821:Silanes