title: Effect of different surface treatments for ceramic bracket base on bond strength of rebonded brackets.
abstract: The aim of this study was to evaluate the shear bond strength of rebonded ceramic brackets after subjecting the bracket base to different treatments. Seventy-five premolars were selected and randomly distributed into five groups (n=15), according to the type of the bracket surface treatment: I, no treatment, first bonding (control); II, sandblasting with aluminum oxide; III, sandblasting + silane; IV, silica coating + silane; and V, silicatization performed in a laboratory (Rocatec system). The brackets were fixed on an enamel surface with Transbond XT resin without acid etching. The brackets were then removed and their bases were subjected to different treatments. Thereafter, the brackets were fixed again to the enamel surface and the specimens were subjected to shear bond strength (SBS) test. The adhesive remnant index (ARI) was then evaluated for each specimen. Data were subjected to ANOVA and Tukey's tests (α=0.05). A statistically significant difference was observed only between Rocatec and the other groups; the Rocatec group showed the lowest SBS values. The highest SBS values were observed for group 1, without any significant difference from the values for groups II, III and IV. Most groups had a higher percentage of failures at the enamel-resin interface (score 1). It was concluded that the surface treatments of rebonded ceramic brackets were effective, with SBS values similar to that of the control group, except Rocatec group.
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Monique Kruger
authors: MK
authors: Guarita
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Alexa Helena Köhler
authors: AH
authors: Moresca
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Estela Maris
authors: EM
authors: Losso
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Alexandre
authors: A
authors: Moro
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Ricardo Cesar
authors: RC
authors: Moresca
authors: Graduate Program in Dentistry, UP - Positivo University, Curitiba, PR, Brazil.
authors: Gisele Maria
authors: GM
authors: Correr
mesh_terms: D020906:Air Abrasion, Dental; D000537:Aluminum Oxide / Q000737:chemistry; D001641:Bicuspid; D002516:Ceramics / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D017005:Dental Debonding; D003799:Dental Stress Analysis; D055115:Light-Curing of Dental Adhesives; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties
chemical_list: D019279:Resin Cements; D012821:Silanes; C477790:Transbond XT; D012822:Silicon Dioxide; D000537:Aluminum Oxide