Comparison of shear bond strength of orthodontic brackets bonded with halogen and plasma arc light curing

Mohammad Hossein Toodehzaeim, Alireza Danesh Kazemi, Hossein Agha Aghili, Kazem Barzegar, Taranom Fallahtafti


Background: Reduced time and appropriate bond strength of brackets is one of the most
important aspects of orthodontic treatments. Prolonged halogen light curing for bonding of brackets
is undesirable, so the purpose of this study was to compare the shear bond strength of brackets
bonded with halogen light and plasma arc system.
Materials and Mehods: This was an experimental in vitro study. A total of 60 intact premolar teeth
were collected and divided into four groups. Stainless steel orthodontic brackets were bonded to
them. In groups 1 and 2, curing was done using halogen light given for 20 seconds from two and four
angles. In groups 3 and 4, curing was carried out using the plasma arc system for 6 seconds from
two 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 four
groups (P = 0.043) and between group 1 with group 2 (P = 0.035). Yet, there was no statistically
significant difference between brackets bonded with plasma arc and those bonded with halogen
light or between the two groups of plasma arc.
Conclusion: Using the plasma arc system is superior to other methods due to reduced curing
time. Also, since in using the halogen light system, an increase in curing periods from different
angles resulted in a significant increase in shear bond strength; it is advisable to apply the halogen
light from different angles.
Key Words: Halogen light, plasma arc, shear bond strength

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