A comparative study of maxillary canine retraction with friction versus non-friction mechanics

Abstract

Canine retraction after first premolar extraction is a very common orthodontic procedure. Retraction equipment can be divided into two categories, friction and without friction. It is desirable for the canine to lose weight quickly. The purpose of the current study was to compare the rate of withdraw, degree of tipping , rotation of maxillary canine and  to compare mesial molar movement during canine retraction with friction and non friction mechanics.  Objective of  the study   was to establish an efficient method of canine retraction so as to have a consistent force  with minimal unwanted movements such as tipping , rotations and  mesial molar movement.

Methodology- The study sample comprised twenty subjects.  In this treatment the two upper first premolars were removed.  The maxillary canines were moved distally into the extraction spaces .The forces withdrawal for canine with friction mechanics was derived from an Niti coil spring & For non friction mechanics TMA segmented T-loop Measurements were made on cephalograms and on images of Dental casts.

Conclusion-. The canine is withdrawn quickly and with less distal tipping and spring than the sliding mechanics. The canine retrieval spring did not pass for sliding mechanics in controlling canine rotation during retraction.