Comparative evaluation of Nickel-Titanium closed coil spring and Elastomeric chain for canine retraction. A Randomized Clinical Trial
Journal Title: IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) - Year 2018, Vol 17, Issue 10
Abstract
Introduction:Preadjusted Edgewise appliance (MBT) has popularized the use of sliding mechanics, which has become the most commonly used method of achieving space closure in orthodontics. In the quest for the most efficient method of delivering constant retractive force to the teeth, NiTi closed coil springs and the elastomeric chains have been the most commonly used modalities. The aim of this investigation was to find out and compare the rate of mandibular canine retraction with NiTi closed coil spring and elastomeric chain delivering 200grams of force with sliding mechanics using preadjusted edgewise appliances. Methods:In this Randomized clinical trial, 30 patients with bimaxillary dentoalveolar protrusion to be treated with 1st premolar extraction and high anteroposterior anchorage requirement, were included. All of them were bonded with 0.022 MBT bracket prescription. After alignment and leveling, each patient was assigned a number,then allocated into a groups with the help of computer-generated random number table. The mandibular canine retraction was started in the two groups with the help of NiTi closed coil spring and Elastomeric chain delivering 200grams of force and at each visit after 4 weeks interval, the force levels were checked and calibrated at every appointment for 3months. Results:A statistically significant difference was seen between the rate of mandibular canine retractionusing NiTi closed coil spring and elastomeric chains. However, the difference seemed to be clinically non-significant. The mean rate of space closure for NiTi closed coil spring and the Elastomeric chain was 1.62±0.14mm/month and 1.33±0.13mm/month respectively. Conclusion:NiTi closed coil spring was found to be more efficient in retracting the mandibular canine, the difference however was clinically non-significant. Additionally, the clinician should take into account the considerable cost factor associated with NiTi closed coil springs. Thus, Elastomeric chains present as a suitable alternative to NiTi coil spring for space closure in sliding mechanics
Authors and Affiliations
Aditya Talwar, Shweta R Bhat
Keywords
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- DOI 10.9790/0853-1710097075.
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