Abstract
Introduction: Orthodontic treatment is presently dominated by two techniques, the Begg light wire differential force technique and the preadjusted edgewise technique. Orthodontic appliances at present commonly utilize sliding mechanics for extraction space closure with different types of force delivery systems. Materials and methods: The present study was designed to compare the rates of retraction and anchorage loss between elastics, elastomeric chains and nickel-titanium (NiTi) closed coil springs, using a continuous archwire system with the Begg light wire differential force technique. Results: The rate of canine retraction was faster by 0.6 mm per month with the NiTi closed coil spring compared to elastics and elastomeric chains. The NiTi closed coil springs produced more rapid rate of canine retraction but they also produced the greatest amount of anchorage loss.
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