2022, Vol. 8 Issue 1, Part F
Clinical efficacy of open and close loops in retraction
AUTHOR(S): Dr. Kulsum Guroo and Dr. Gauri Vichare
Objective: To evaluate the clinical efficacy of open and closed loop during incisor retraction by comparing the rate of incisor retraction, the effect on incisors and anchorage unit.
Materials and Methods: This clinical study included 24 participants treated with first bicuspid extraction which were randomly divided into two groups. Group I received Open tear drop loop and Group II received closed vertical shaped loop for space closure mechanics. The duration of the study was four months. Study models and lateral cephalograms were taken at the start (T0) and end of study period (T4).
Results: Nasolabial angle increased significantly from T0 to T4 in the open loop group. The inter-canine width and arch length reduced more in open loop group. The rate of incisal retraction per day as calculated from arch length was more in open loop with 0.023 mm (0.0044), as compared with close loop 0.0194 mm (0.00475). The degree of molar rotation was more with open loop as compared with close loop.
Conclusion: The pattern of space closure was different in both the groups. There was a more controlled retraction of incisors in the closed loop group with no incisor torque loss but slower rate of retraction Whereas, the open loop shows faster retraction but at the expense of molar rotation and reduction in inter-canine width.
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