الفهرس 
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Abstract
The current study was carried out to compare three dimensionally
between the outcome of using sliding mechanics represented by a NiTi
closed coil spring versus sectional mechanics represented by T-loop on the
canine and first molar during canine retraction regarding antro posterior
position, mesio-distal tipping, Bucco-lingual inclination, mesio-distal
rotation, vertical position and root resorption.