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Comparative evaluation of rate of retraction in Angles Class I malocclusion requiring extractions using MV loop and Opus loop in Central Indian population: A Randomised Control Trial -A Research Protocol.
ABSTRACT
Background:
Efficient closure of extraction spaces is critical in orthodontic treatment following premolar extractions. Frictionless mechanics, particularly the use of loop designs, offer controlled tooth movement while minimizing unwanted side effects. This study focuses on comparing the Multiple Variability (MV) loop and the Opus loop for en-masse anterior
Objective:
To evaluate and compare the rate of space closure and anchorage loss during anterior retraction using MV loop and Opus loop in patients with Angle’s Class I malocclusion.
Methods:
This randomized controlled trial will recruit 30 patients aged 15–30 years diagnosed with Angle’s Class I malocclusion requiring extraction of all first premolars. Patients will be randomly assigned into two groups (MV loop and Opus loop) using the chit method. Following leveling and alignment using 0.022” x 0.028” MBT prescription brackets, extraction will be performed, and retraction will begin using 0.019" x 0.025" TMA wire. Assessments include angular (upper incisor to SN) and linear measurements (incisal exposure, palatal plane to molar, PVT to molar) taken from lateral cephalograms at baseline (T0), 3 months (T1), 6 months (T2), and post-treatment (T3). Study models will be evaluated for extraction space reduction and molar rotation. Statistical analysis will be conducted using SPSS v27.0 and GraphPad Prism v7.0 with significance set at p<0.05.This randomized controlled trial will recruit 30 patients aged 15–30 years diagnosed with Angle’s Class I malocclusion requiring extraction of all first premolars. Patients will be randomly assigned into two groups (MV loop and Opus loop) using the chit method. Following leveling and alignment using 0.022” x 0.028” MBT prescription brackets, extraction will be performed, and retraction will begin using 0.019" x 0.025" TMA wire. Assessments include angular (upper incisor to SN) and linear measurements (incisal exposure, palatal plane to molar, PVT to molar) taken from lateral cephalograms at baseline (T0), 3 months (T1), 6 months (T2), and post-treatment (T3). Study models will be evaluated for extraction space reduction and molar rotation. Statistical analysis will be conducted using SPSS v27.0 and GraphPad Prism v7.0 with significance set at p<0.05.
Results:
It is hypothesized that the MV loop will demonstrate superior efficiency in achieving bodily tooth movement with minimal anchorage loss compared to the Opus loop.
Conclusions:
This study aims to provide insight into optimal retraction mechanics, aiding clinicians in making informed treatment decisions. Clinical Trial: registed in Clinical Trials Registry - India (ICMR-NIMS) TRI No CTRI/2025/08/093801
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