title: The effect of changing crosshead speed on the shear bond strength of orthodontic bonding adhesive.
abstract: OBJECTIVE
  To examine the influence of different crosshead speeds on the in vitro shear bond strength and adhesive remnant index scores for the same orthodontic adhesive.
  
  
  METHODS
  One hundred human molars were randomly allocated to four groups. Brackets (.022 inch Victory series, 3M, Monrovia, CA, USA) were bonded with Ortho Solo primer (Ormco, Glendora, CA, USA) and Enlight (Ormco, Glendora, CA, USA) adhesive paste to their buccal surfaces. The brackets were debonded with a universal testing machine (Instron, Canton, MA, USA) with each group subjected to a different crosshead speed of 0.5 mm/min, 1.0 mm/min, 2.0 mm/min and 5.0 mm/minute. Shear bond strength (SBS) was measured and enamel surfaces were examined to determine the adhesive remnant index (ARI) score.
  
  
  RESULTS
  No significant differences were found between the mean SBS or ARI score for any of the groups.
  
  
  CONCLUSIONS
  Studies using different crosshead speeds when testing identical adhesives may be used to compare the SBS of other orthodontic adhesives, provided the testing protocols are similar.
authors.affiliation: Orthodontic Unit, School of Dentistry, The School of Dentistry, The University of Queensland, Australia. kerry_shooter@hotmail.com
authors.forename: Kerry J
authors.initials: KJ
authors.lastname: Shooter
authors.forename: Mark P
authors.initials: MP
authors.lastname: Griffin
authors.forename: Brett
authors.initials: B
authors.lastname: Kerr
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding; D017005:Dental Debonding / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D018709:Statistics, Nonparametric
chemical_list: C418867:Enlight; D019279:Resin Cements