Shear Bond Strength of Two Light Cure Composites after Thermocycling

Application of light cure composites has become very popular in orthodontics. The aim of this study was to compare shear bond strength (SBS) of Ideal Maccoo and Vit L-essence light cure composites in bracket bonding after thermocycling.
100 intact freshly extracted upper first premolars were randomly assigned into four equal groups. In the first and second group Vit L-essence composite was applied to the bracket base and transferred to buccal enamel surface and cured for 40 seconds. In the third and fourth group Ideal Maccoo composite was used for bracket bonding. After 24 hours the teeth in the first and third group were thermocycled between 5 to 55°C and then debonding was performed by Zwick testing machine. The mean shear bond strength of four groups was compared by ANOVA test.
There was no significant difference between Vit L-essence and Ideal Maccoo composite either before or after thermo cycling. SBS also did not differ significantly before and after thermo cycling in each single group.
It was concluded that: 1-Therrnocycling did not affect the SBS of Vit-Lessence and Ideal Maccoo composite in bracket bonding. 2- There was no significant difference in SBS of Vit L-essence and Ideal Maccoo composite either before or after themocycling (DO 2006; 1:168-71).