The Effect of Pre-Cure Bracket Movement on the Shear Bond Strength of Metal Brackets

• Main Author: Roberts, Thomas Luther, IV
• Format: Others
• Published: VCU Scholars Compass 2007
• Subjects: shear bond strength; pre-cure bracket movement; bracket manipulation; ARI; weibull; bonding study; orthodontics; Dentistry; Medicine and Health Sciences; Orthodontics and Orthodontology
• Online Access: http://scholarscompass.vcu.edu/etd/1482; http://scholarscompass.vcu.edu/cgi/viewcontent.cgi?article=2481&context=etd

The effect on shear bond strength of bracket movement after seating the brackets and before light curing has not been reported. The purpose of this study was to determine the effect of linear and rotational pre-cure bracket movement on the shear bond strength of orthodontic brackets. 100 extracted human maxillary premolars were divided into 5 groups of 20 teeth each. The control group was bonded with no pre-cure bracket movement, and test groups were bonded with pre-cure bracket movement of 2 mm, 4 mm, 45¢ª or 180¢ª. Debonding force was measured with an Instron universal testing machine. Results were analyzed by ANOVA. Weibull survival analysis was used to determine the force required to produce a 5% bracket failure rate. Differences in the Adhesive Remnant Index (ARI) were analyzed by chi-square. No significant differences between groups were found for the mean shear bond strength or Weibull estimates. ARI scores differed significantly.