title: Effects of surface treatment of provisional crowns on the shear bond strength of brackets.
abstract: OBJECTIVE
  To assess the adhesive resistance of metallic brackets bonded to temporary crowns made of acrylic resin after different surface treatments.
  
  
  METHODS
  180 specimens were made of Duralay and randomly divided into 6 groups (n = 30) according to surface treatment and bonding material: G1 - surface roughening with Soflex and bonding with Duralay; G2 - roughening with aluminum oxide blasting and bonding with Duralay; G3 - application of monomer and bonding with Duralay; G4 - roughening with Soflex and bonding with Transbond XT; G5 - roughening with aluminum oxide blasting and bonding with Transbond XT and G6 - application of monomer and bonding with Transbond. The results were statistically assessed by ANOVA/Games-Howell.
  
  
  RESULTS
  The means (MPa) were: G1= 18.04, G2= 22.64, G3= 22.4, G4= 9.71, G5= 11.23, G6= 9.67. The Adhesive Remnant Index (ARI) ranged between 2 and 3 on G1, G2 and G3 whereas in G4, G5 and G6 it ranged from 0 to 1, showing that only the material affects the pattern of adhesive flaw.
  
  
  CONCLUSIONS
  The surface treatment and the material influenced adhesive resistance of brackets bonded to temporary crowns. Roughening by aluminum blasting increased bond strength when compared to Soflex, in the group bonded with Duralay. The bond strength of Duralay acrylic resin was superior to that of Transbond XT composite resin.
authors.forename: Josiane Xavier
authors.initials: JX
authors.lastname: de Almeida
authors.forename: Mauren Bitencourt
authors.initials: MB
authors.lastname: Deprá
authors.forename: Mariana
authors.initials: M
authors.lastname: Marquezan
authors.forename: Luciana Borges
authors.initials: LB
authors.lastname: Retamoso
authors.forename: Orlando
authors.initials: O
authors.lastname: Tanaka
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D003442:Crowns; D045662:Dental Etching / Q000379:methods; D008422:Materials Testing / Q000379:methods; D008768:Methylmethacrylates / Q000737:chemistry*; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013499:Surface Properties
chemical_list: D008768:Methylmethacrylates; D019279:Resin Cements; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate; C034578:Duralay
keywords: Acrylic resins; Orthodontic brackets; Shear bond strength