Effects of two frequencies of vibration on the maxillary canine distalization rate and RANKL and OPG secretion: a randomized controlled trial.

OBJECTIVES: To investigate the effects of 30 and 60 Hz vibratory stimulus on canine distalization and RANKL and OPG secretion.

SETTING AND SAMPLE POPULATION: Sixty patients requiring canine distalization at the Orthodontic Clinic, X X X University.

MATERIALS AND METHODS: Patients were randomly assigned to 30 Hz vibration (n=20), 60 Hz vibration (n=20), or the control group (n=20). Modified electric toothbrushes were used to apply vibration to the randomly selected canine for 20 min/day by the investigator combined with 60 cN continuous distalization force from day 1 to day 7. RANKL and OPG were analysed before (T1) and 24 h (T2), 48 h (T3) and 7 days (T4) after initiation of distalization. From day 8, vibratory devices were used by the subjects at home. Rate of canine distalization (T1 to three months after initiation [T5]) was calculated. Kruskal-Wallis tests were used for multiple comparisons (significance level, 0.05).

RESULTS: Canine distalization rate was not different between groups (median; 0.82, 0.87, and 0.83 mm/month for 30 Hz, 60 Hz, and control group, respectively; P>0.05). No within- or between-group differences in RANKL and OPG were observed (P>0.05), except RANKL on the compression side of the control group was significantly higher at T2, T3 and T4 than T1 (P<0.001).

CONCLUSION: In the clinic, 30 and 60 Hz vibratory stimulus have no additive effect on rate of canine distalization rate, RANKL and OPG secretion or RANKL/OPG ratio. This article is protected by copyright. All rights reserved.