LOOP MECHANICS
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Orthodontics deals with the alignment of the teeth in order to achieve optimal function and aesthetics. This often entails extraction of certain teeth, usually first premolars in order to take care of the arch length-tooth material discrepancies as well as to improve the patient's profile. Extraction space closure is an integral part of orthodontic treatment which demands a thorough understanding of the biomechanics. In the pre-adjusted edgewise technique, retraction is achieved either with friction (sliding) or frictionless mechanics. Frictionless mechanics have evolved from simple vertical l...