SBS Of Orthodontic Brackets Bonded With Different Curing Methods

Objectives: the aims of the study were to evaluate the effect of different types of curing devices - with different curing times - and delay force loading on the shear bond strength (SBS) of orthodontic brackets. Methods: 60-extracted human premolars were divided into 6-groups of 10-teeth each and bonded with stainless-steel brackets using 3M Unitek Transbond XT composite. Specimens were cured with halogen, LED and plasma light curing devices with two different times for each. The specimens were subjected to shear force after 24h till debond with a crosshead speed of 1mm/min. The results were subjected to statistical analysis to identify differences in mean SBS. Results: There were significant differences between Group LED 20s after 24 hours and the groups 3, 5 and 6 as P-value < 0.05. Conclusion: Within limit of this study, halogen (20 and 40s), LED (10 and 20s) and plasma arc (6 and 10s) can be used to bond brackets, however if high force is needed, LED 20s with loading time after 24h is recommended.