Is there any differential efficacy among different vibrational frequencies and duration of sessions on tooth movement acceleration? A systematic review

Aim: The aim of this review was to appraise the existence of any differential efficacy among different vibrational frequencies and duration of sessions on the acceleration of tooth movement. Materials and Methods: An extensive search was performed from inception to November 2019 in seven databases. Only randomized controlled trials were included. Risk of bias was assessed using Cochrane’s collaboration tool. Six different combinations of frequencies and durations were utilized by the studies including: (30 Hz: 20 min/day), (111 Hz: 20 min/day), (113 Hz: 10 min/day), (120 Hz: 5 min/day), (125 Hz: 20 min/day) and (125 Hz: 15 min/day). Results: Significant differences were found in (113 Hz: 10 min/day), (120 Hz: 5 min/day), and (125 Hz: 15 min/day) compared with control groups. Mainly, no significant differences were appreciated among other combinations. Finally, attrition bias was accounted for the principal factor affecting the methodology of current studies. Conclusion: According to the available information, a weak evidence suggests a differential efficacy on tooth movement acceleration among different vibrational frequencies and durations. Parameters of 113 Hz applied for 10 min/day, 120 Hz applied for 5 min/day and 125 Hz applied for 15 min/day seemed to be more effective than the other utilized parameter