Evaluation of space closure rate during canine retraction with nickel titanium closed coil spring and elastomeric chain.

Abstract

Aims:. To investigate the rates of space closure achieved by elastomeric chain and nickel titanium coil springs with the evaluation of the effects of using different bracket types on the rate of space closure during its retraction along different sizes of orthodontic arch wires using typodont simulation system (Ormco). Materials and Methods: The standardization criteria were all typodont teeth situated in well aligned position, covered and immobilized by the acrylic bite except canine, elastic chain and nickeltitanium closed coil spring exerting 180 gm of force on canine measured carefully by tension gauge. The available space was 13.5mm (the rate of space closure). Results: The present study showed that when using elastic chain as a method of canine retraction gave rise to a a significant decrease in the rate of space closure as compared with nickeltitanium closed coil spring also sliding the canine using ceramic brackets gave rise significant reduction in the rate of space closure than when using stainless steel brackets. Another finding of the present study showed that sliding the canine on large rectangular arch wire (0.019x0.025 inch) gave rise to a significant reduction in the rate of space closure when compared with 0.018 inch and 0.018x0.022 inch arch wires were used. Conclusions: It was concluded that the canine retraction with 0.018 inch wire on Roth stainless steel bracket by closed coil spring gave rise a large amount of space closure rate. While the opposite is true for canine retraction with 0.019x0.025 inch wire on standard ceramic bracket by elastic chain retraction method.

Space Closure Rate in Mandibular Canine Retraction by Ni-Ti Closed Coil Spring: A Clinical Trial

“…Any procedure which reduces the time required to retract canine will also serve to shorten overall treatment time. Reducing the duration of orthodontic treatment is of great interest to orthodontists 15,16,17 . In context of Bangladesh, there is no study regarding space closure rate in canine retraction by any force system.…”

Space Closure Rate in Mandibular Canine Retraction by Elastomeric Power Chain: A Clinical Trial

“…Any procedure which reduces the time required to retract canine will also serve to shorten overall treatment time. Reducing the duration of orthodontic treatment is of great interest to orthodontists [16][17][18] . In context of Bangladesh, there is no study regarding space closure rate in canine retraction by any force system.…”

Three Dimenaional Evaluation Of The Effect Of Discision On Canine Retraction

“…Canine tip in right side ( trial group ) was moved 2 mm more than left side (control group ) while canine apex in right side was moved 1.3 more than left side . Although canine was ligated with stainless-steel ligature wire , This difference between canine tip and apex movement is due to long roots of canine and its morphology which make it impossible to retract the canine without tipping as stated withBabu SH (2005 )26 .Conclusion Acceleration of canine movement canbe done with discision due to osteopenia that had happened in bone after discision that lead to less resistance to canine movement during retraction thus need less time than conventional rtraction without discision…”