Year : 2016

Volume : Volume 6

Issue : Issue 1

Address for correspondence :
Dr. Sanju Somaiah
drsanjusomaiah@yahoo.com

Abstract

Aim:  The aim for this study was to evaluate two different types of loop mechanics in canine retraction, namely modified Nickel Titanium (Ni-Ti) retraction spring and the T loop. Material and Methods: 10 patients were selected, on which a modified Nickel Titanium spring made with 0.016” x 0.022” Ni-Ti wire and T loop made with 0.016” x 0 .022” Titanium molybdenum alloy (TMA) wire, according to the recommendations of the author were made and placed on canine on each of the quadrants of upper arch in the same patient. All the cases were supplemented by study models, photographs and OPG (Orthopantomogram) taken at pre and post retraction stages.Rate of retraction, Rate of tipping and anchorage loss was measured for both Ni-Ti loop and T loop. Results: Ni- Ti loop showed increased rate of canine retraction when compared to the T loop which was clinically and statistically significant.T loop showed more anchorage control than the Ni-Ti loop although the difference was not statistically significant.The rate and the amount of canine tipping was more with the T loop when compared to the Ni-Ti loop. Equal amount of canine rotation was observed clinically for both the loops. Conclusion: Ni-Ti loop showed faster retraction rate and lesser amount of tipping than the T loop. T loop showed more anchorage control than the Ni-Ti loop although the difference was not statistically significant. Clinically both the loops showed equal rotation of the canine.

Keywords: Retraction, loop mechanics, Ni-Ti loop, T loop.