Isfahan University of Medical SciencesDental Research Journal1735-33279320120821Comparison of shear bond strength of orthodontic brackets bonded with halogen and plasma arc light curing10921092ENMohammad HosseinToodehzaeimAlirezaDanesh KazemiDepartment of Operative Dentistry, Shahid Sadughi University of Medical Sciences, Yazd, Iran. danesh@ssu.ac.irHosseinAgha AghiliKazemBarzegarTaranomFallahtafti20120821Background: Reduced time and appropriate bond strength of brackets is one of the mostimportant aspects of orthodontic treatments. Prolonged halogen light curing for bonding of bracketsis undesirable, so the purpose of this study was to compare the shear bond strength of bracketsbonded with halogen light and plasma arc system.Materials and Mehods: This was an experimental in vitro study. A total of 60 intact premolar teethwere collected and divided into four groups. Stainless steel orthodontic brackets were bonded tothem. In groups 1 and 2, curing was done using halogen light given for 20 seconds from two and fourangles. In groups 3 and 4, curing was carried out using the plasma arc system for 6 seconds fromtwo and four angles. The shear bond strength was recorded by Instron. The statistics of ANOVA,Tukey’s test, and T-test were used in data analysis.Results: There was a statistically significant difference in shear bond strength among the fourgroups (P = 0.043) and between group 1 with group 2 (P = 0.035). Yet, there was no statisticallysignificant difference between brackets bonded with plasma arc and those bonded with halogenlight or between the two groups of plasma arc.Conclusion: Using the plasma arc system is superior to other methods due to reduced curingtime. Also, since in using the halogen light system, an increase in curing periods from differentangles resulted in a significant increase in shear bond strength; it is advisable to apply the halogenlight from different angles.Key Words: Halogen light, plasma arc, shear bond strength