title: Shear bond strength of brackets bonded to enamel with a self-etching primer. Effects of increasing storage time after activation.
abstract: OBJECTIVE
  To evaluate bonding efficacy of activated Transbond Plus Self-Etching Primer (TPSEP) used at different time points with Transbond XT to bond metallic orthodontic brackets to bovine incisors.
  
  
  METHODS
  The inferior incisors of 210 bovines were randomly divided into seven groups (n = 30). TPSEPs were mixed, activated, and kept activated for 30 (group 30), 21 (group 21), 15 (group 15), 7 (group 7), 3 (group 3), or 1 (group 1) days before bonding, and in one group (group 0) TPSEP was used immediately after mixed. At day zero, incisors in each group were bonded in exactly the same way. After applying TPSEP, brackets were bonded with Transbond XT, according to the manufacturer's instructions. After 24 hours, shear bond strength (SBS) tests were performed for all samples at a crosshead speed of 0.5 mm/min, and the Adhesive Remnant Index was scored.
  
  
  RESULTS
  There were no significant differences between the SBS of groups 0, 1, 3, 7, and 15 (P > .05) However, those groups had higher SBS (P < .05) compared with groups 21 and 30. No significant difference (P > .05) was observed between groups 21 and 30. Despite the decrease in SBS for groups 21 and 30, bond strength values were still satisfactory.
  
  
  CONCLUSIONS
  After activation, the TPSEP mix can be stored for a period of 15 days without losing its adhesive properties.
authors.affiliation: Federal University of Alfenas, Brazil. matheuspithon@bol.com.br
authors.forename: Matheus Melo
authors.initials: MM
authors.lastname: Pithon
authors.forename: Antonio Carlos
authors.initials: AC
authors.lastname: de Oliveira Ruellas
authors.forename: Eduardo Franzotti
authors.initials: EF
authors.lastname: Sant'Anna
authors.forename: Márlio Vinícius
authors.initials: MV
authors.lastname: de Oliveira
authors.forename: Luiz Antônio
authors.initials: LA
authors.lastname: Alves Bernardes
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D017005:Dental Debonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D004356:Drug Storage; D008422:Materials Testing; D016910:Orthodontic Brackets; D011897:Random Allocation; D019279:Resin Cements; D033081:Shear Strength
chemical_list: D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT