title: Effect of composite containing an iodonium salt on the bond strength of brackets to bovine enamel.
abstract: This study investigated the effect of the incorporation of an iodonium salt in experimental composites, on the bond strength of metallic brackets bonded to bovine teeth. Two hundred and seventy bovine teeth were embedded in self-curing acrylic resin and divided into 18 groups (n=15), according to the experimental composite with an iodonium salt at molar concentrations 0 (control), 0.5, or 1%; the light-activation times (8, 20 and 40 s); and the storage times (10 min or 24 h). Metallic brackets were fixed on the tooth surface using experimental composites. Photoactivation was performed with a quartz-tungsten-halogen light-curing unit curing unit for 8, 20 and 40 s. The specimens were stored in distilled water at 37 °C for 10 min or 24 h and submitted to bond strength test at 0.5 mm/min. The data were subjected to three-way ANOVA and Tukey's test (α=0.05). The Adhesive Remnant Index (ARI) was used to classify the failure modes. The shear bond strengths (MPa) at 10 min for light-activation times of 8, 20 and 40 s were: G1 - 4.6, 6.9 and 7.1; G2 - 8.1, 9.2 and 9.9; G3 - 9.1, 10.4 and 10.7; and at 24 h were: G1 - 10.9, 11.1 and 11.7; G2 - 11.8, 12.7 and 14.2; G3 - 12.1, 14.4 and 15.8. There was a predominance of ARI score 3 for groups with 10 min storage time, and ARI score 2 for groups with 24 h storage time. In conclusion, the addition of iodonium salt (C05 and C1) to the experimental composite may increase the bond strength of brackets to bovine enamel using reduced light exposure times.
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba School of Dentistry, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Eveline Freitas
authors.initials: EF
authors.lastname: Soares
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba School of Dentistry, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Ana Rosa
authors.initials: AR
authors.lastname: Costa
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba School of Dentistry, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Américo Bortolazzo
authors.initials: AB
authors.lastname: Correr
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - University of Araras, Araras, SP, Brazil.
authors.forename: Silvia Amélia
authors.initials: SA
authors.lastname: Vedovello
authors.affiliation: Department of Orthodontics, Graduate Program in Orthodontics, UNIARARAS - University of Araras, Araras, SP, Brazil.
authors.forename: Mário
authors.initials: M
authors.lastname: Vedovello Filho
authors.affiliation: Materials Engineering School, UFPel - Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Fabrício Aulo
authors.initials: FA
authors.lastname: Ogliari
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, UFPel - Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Rafael Ratto
authors.initials: RR
authors.lastname: de Moraes
authors.affiliation: Department of Restorative Dentistry, Dental Materials Division, Piracicaba School of Dentistry, UNICAMP - University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Lourenço
authors.initials: L
authors.lastname: Correr-Sobrinho
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D003743:Dental Enamel; D007455:Iodine / Q000737:chemistry*; D016910:Orthodontic Brackets; D012492:Salts
chemical_list: D003188:Composite Resins; D012492:Salts; D007455:Iodine