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Traditionally these modules have been used for retraction of anterior teeth to close extraction spaces as well as midline diastemas with the advent of Super elastic ni ti coil springs which can deliver low constant forces , use of elastomerics has diminished significantly Then there has been a criticism related to lack of mechanical control of teeth Engaged with elastomerics chains , because loss of directional control of moments leads occasionally to undesirable mesio-distal or bucco-lingual rotations as describes previously that the elastometic chains loose almost half the applied force www.indiandentalacademy.com