Abstract
BackgroundExtraction of the first premolar followed by canine retraction into the extraction space is a common treatment in orthodontics. Molar rotation occurs when they are used as anchorage units for the canine distalization. The aim of this single-arm clinical trial was to evaluate the maxillary first molar rotation during maxillary canine retraction with elastic power chains and direct miniscrew anchorage.ResultsThe mean difference between pre-retraction and post-retraction molar rotation was 1.89° ± 0.6 which was statistically insignificant.ConclusionThe use of miniscrews for direct anchorage can eliminate unwanted rotation of the maxillary first molars during canine retraction.Trial registration ClinicalTrials.gov, NCT04887974. Registered on May 6, 2021- Retrospectively registered https://clinicaltrials.gov/ct2/show/NCT04887974?id=NCT04887974&draw=2&rank=1.
Highlights
Extraction of the first premolar followed by canine retraction into the extraction space is a common treatment in orthodontics
The aim of this study is to evaluate maxillary first molar rotation during maxillary canine retraction with elastic power chains in first premolar extraction cases using miniscrews for direct anchorage
The study was performed between April 2016 and January 2017, in the outpatient clinic of the Orthodontic Department, Faculty of Oral and Dental Medicine, Future University in Egypt
Summary
Extraction of the first premolar followed by canine retraction into the extraction space is a common treatment in orthodontics. Molar rotation occurs when they are used as anchorage units for the canine distalization. The aim of this single-arm clinical trial was to evaluate the maxillary first molar rotation during maxillary canine retrac‐ tion with elastic power chains and direct miniscrew anchorage. Most commonly sliding mechanics is achieved using power chains or nickel titanium coil springs which produce intermittent forces or continuous forces, respectively. Power chains produced similar rates of retraction to nickel titanium coil springs, and have the added advantage of being easier to use and cheaper in cost (Mohammed et al 2018). During canine retraction, tipping and rotation of the canines and first molars are common, if not controlled (Acar et al 1999; Nightingale and Jones 2003)
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