Comparison of individual canine retraction using HYCON device and nickel titanium closed coil spring: In vivo study

Abstract

Objective: To compare the individual canine retraction using HYCON device and Nickel Titanium closed coil springs. Materials and Methods: The sample consists of 20 patients, 10 males and 10 females. Class1 bimaxillary protrusion cases were selected for the study with age group ranging from 14 to 23 years. HYCON device was placed on the right side of the maxillary arch and Nickel Titanium closed coil spring were placed on left side of the maxillary arch. Lateral cephalograms, OPG and study models were taken before retraction (T0) and records were taken after retraction (T1). Results: The duration of this study is for 3 months. HYCON device retracted canines by 2.42 mm/mo whereas NiTi closed coil spring retracted canines by 1.34 mm/mo in a period of 3 months. Anchorage loss with a minimal of 1.40 mm is seen in HYCON device whereas in case of NiTi closed coil spring the anchorage loss was 3.35 mm. The angular rotation of canines measured was found to be 2.59 degrees in HYCON device and 10.80 in NiTi closed coil spring. Clinically and radiologically, in most of the cases canines moved bodily with 1.90 degrees of tipping for HYCON device while NiTi closed coil spring canine tipping was 6.95 degrees. Conclusion: For rapid space closure HYCON device is a promising appliance. With HYCON device, canines can be completely retracted in 3 months and there was bodily movement of canines seen in all cases with minimum amount of tipping.