الفهرس 
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Abstract
Aim: the aim of this study is to compare the rate of alignment per month of two different
frequencies of archwire activation
Methodology: 19 patients were divided into 2 groups. In the intervention group the archwire was
changed every 6 weeks while in the control group the archwire was changed every 4 weeks.
Impressions were taken monthly and digitized so that Little‘s irregularity index was measured on
digital models.
Results: the difference in the rate of alignment between both groups was statistically insignificant,
while the inclination of upper incisors in both groups increased in a statistically significant manner
Conclusion: both activation frequencies achieved alignment of the arch and relieved crowding with
the near rate of alignment.