title: Shear bond strength of brackets bonded with hydrophilic and hydrophobic bond systems under contamination.
abstract: OBJECTIVE
  To compare, in vitro, the shear bond strength (SBS) of two bond systems: Transbond XT/XT primer (TXT/XT) and Transbond Plus Color Change/Transbond Self Etching Primer (TPCC/TSEP).
  
  
  METHODS
  Each system was examined under four enamel surface conditions (dry, water, saliva, and blood), and 160 bovine teeth were divided into eight groups of 20 according to enamel surface condition. Group 1 used TPCC/TSEP and Group 2 used TXT/XT under dry conditions; Group 3 used TPCC/TSEP and Group 4 used TXT/XT with water; Group 5 used TPCC/TSEP and Group 6 used TXT/XT under saliva; and Group 7 used TPCC/TSEP and Group 8 used TXT/XT with blood. Brackets were bonded, and the samples were thermocycled 500 times between 5 degrees C and 55 degrees C; they were then submitted to a shear bond test with a universal testing machine with a 50 kgf load cell at 5 mm/min.
  
  
  RESULTS
  Although water and saliva affected TXT/XT more than they affected TPCC/TSEP, there were no significant differences among the groups (Groups 3 and 4: P = .940; Groups 3 and 5 and Groups 4 and 6: P = 1.000; Groups 3 and 6: P = .988; Groups 4 and 5: P = .690; and Groups 5 and 6: P = .861).
  
  
  CONCLUSIONS
  The presence of blood resulted in the lowest SBS from both bond systems, but especially from TXT/XT. TPCC/TSEP resulted in a higher SBS than TXT/XT under all conditions except the dry enamel surface.
authors.affiliation: Department of Orthodontics, Federal University of Rio de Janeiro Dental School, Rio de Janeiro, Brazil.
authors.forename: Bianca Mota
authors.initials: BM
authors.lastname: Santos
authors.forename: Matheus Melo
authors.initials: MM
authors.lastname: Pithon
authors.forename: Antonio Carlos de Oliveira
authors.initials: AC
authors.lastname: Ruellas
authors.forename: Eduardo Franzotti
authors.initials: EF
authors.lastname: Sant'Anna
mesh_terms: D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001769:Blood; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003890:Desiccation; D057927:Hydrophobic and Hydrophilic Interactions; D007180:Incisor; D008422:Materials Testing; D016910:Orthodontic Brackets; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D012463:Saliva; D033081:Shear Strength; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D003188:Composite Resins; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT; C516047:Transbond XT Light Cure Adhesive Primer; D014867:Water; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate