During orthodontic treatment the main objective in treating malocclusions is correcting anteroposterior relationship between the upper and lower arches by obtaining a normal overjet, overbite and a class 1 canine relationship. Usually to obtain the normal A-P relationship extractions are done in either one or both the arches and afterwards space closure is done according the anchorage requirements of the particular patient by means of different techniques.
Sliding mechanics, frictionless mechanics, anchorage, space closure, T loop
