Shear Bond Strength of Different Adhesive Systems for Bonding Orthodontic Brackets to Fluorotic Teeth

ABSTRACT

The aims of this study were to measure and compare the mean shear bond strength of different adhesive systems for bonding orthodontic brackets to fluorotic and normal teeth. One hundred and twenty premolar teeth were divided into six groups (N=20), brackets were bond and fixed to the sample teeth. Groups 1, 2 and 3 contained normal teeth bonded with System TM1+, UniteTM and Super-Bond C\&B. Groups 4, 5 and 6 contained fluorotic teeth bonded with SystemTM1+, UniteTM and Super-Bond C\&B. Thermocycling was performed at 5+2○C and 55+2○C for 1,000 cycles. Shear bond strength was measured using an universal testing machine at a crosshead speed of 0.5 mm/min. The data were analyzed using two-way ANOVA. The results indicated the mean shear bond strength values of all adhesives used on normal teeth were significantly greater than those used on fluorotic teeth (p=0.000). With both normal and\  fluorotic teeth, the mean shear bond strength value of Super-Bond C\&B was significantly greater than the mean shear bond strength values of SystemTM1+and UniteTM (p=0.000).\ Keywords shear bond strength, adhesive systems, fluorotic teeth