AIMS: The primary purpose of the present trial was to evaluate the effect of low-frequency (30Hz) vibrations on the rate of canine retraction. SETTING AND DESIGN: Single-center, split mouth prospective randomized controlled clinical trial METHODS AND MATERIAL: 100 screened subjects (aged18–25 years) were selected; out of which 30 subjects having Class I bimaxillary protrusion or Class II div 1 malocclusion, requiring upper 1 st premolar therapeutic extractions, were selected for the study. A split-mouth study design was prepared for the maxillary arch of each selected individual and was randomly allocated into vibration and nonvibration side (control) groups. A customized vibratory device was fabricated for each subject to deliver low-frequency vibrations (30 Hz). Scanned 3D models were prepared sequentially to assess the amount of tooth movement from baseline (T0),(T1), (T2), (T3), and (T4)-4 th month of canine retraction. STATISTICAL ANALYSIS USED: Independent “t” test. RESULTS: There was no statistically significant differencein the rate of individual canine retraction among the experimental and control groups when the intergroup comparison was done using independent “t” test at T1-T0, ( P = 0.954), T2-T1 ( P = 0.244), T3-T2 ( P = 0.357), and T4-T3 ( P = 0.189). CONCLUSION: The low-frequency vibratory stimulation of 30 Hz using a customized vibratory device did not significantly accelerate the rate of orthodontic tooth movement. TRIAL REGISTRATION: Registered at ctri.nic.in (CTRI/2019/05/019043).

Maxillary canine impaction is a commonly seen condition which is always challenging to the orthodontist to bring the tooth to the normal position and finish the case with proper canine class-I relationship. The "ballista spring system" has some advantages over the previously proposed systems described by different technique by different authors. Since the upper canines are the most frequently impacted teeth with which orthodontists are concerned, the purpose of this article is to describe and discuss a relatively technical approach to the orthodontic extrusion of impacted canine teeth using ballista spring.

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