Shalu Jain

For every person, their face and especially the anterior teeth are essential for aesthetic appearance. Teeth positions play an important role in this regard. Orthodontic treatment aims to position the teeth such that they achieve optimum aesthetics and function.1Torque is the force that enables the orthodontist to control the axial inclination of teeth and to place them in the harmonizing positions that are desirable for finished result. Torque is the force that gives the operator control over the movement of roots of teeth. It represents the bucco-palatal crown/root inclination of a tooth, and it is an orthodontic adaptation used to describe rotation around an x-axis. It is said to be positive when the root is lingually positioned and negative when the root is facially positioned as compared to the crown.2Proper bucco-lingual inclination of anterior and posterior teeth is essential to provide better aesthetic, stability and functional occlusal relationship.

"Retention and relapse" was born with the science of Orthodontics and continues to persistently plague Orthodontic researchers and clinicians. Many orthodontists evaluate the retention phase of orthodontic treatment as the most difficult problem of therapy. In fact, the more conscientious the orthodontist, the more he might regard retention as the problem in treatment. Retention is that part of orthodontic treatment during which a passive appliance is used to maintain orthodontic correction of dental and skeletal structures and thereby counteract relapse or the tendency for return of characteristics to original malocclusion