Evaluation of the mechanical behaviour of different devices for canine retraction

Antônio Carlos de Oliveira RUELLAS, Matheus Melo PITHON, Rogério Lacerda dos SANTOS

Objective: To mechanically evaluate different systems used for canine retraction. Methods: Three different methods for partial canine retraction were evaluated: retraction with elastic chain directly attached to bracket; elastic chain connected to bracket hook and with sliding jig activated with the aid of an elastic chain attached to a mini-implant. For this evaluation, a Typodont was adapted to simulate the desired movements when exposed to a heat source. After obtaining the measurements of the movements, statistical analysis was performed. Results: The mini-implant/sliding jig system (Groups M 0.018-in and M 0.019 x 0.026-in) favored less extrusion and distal inclination of the canines in the retraction stage (p < 0.005). Meanwhile, the retraction system with elastic chain directly attached to the orthodontic brackets (Groups C 0.018-in and 0.019 x 0.026-in) favored greater inclination and extrusion than the others, followed by the system of elastic chain attached to the hook (Groups G 0.018-in and 0.019 x 0.026-in). Conclusions: Canine retraction with the mini-implant/sliding jig system showed the best mechanical control. The worst results were observed with a 0.018 archwire when the elastic chain was attached to the bracket.

Keywords: Corrective Orthodontics. Canine tooth. Malocclusion.

How to cite: Ruellas ACO, Pithon MM, Santos RL. Evaluation of the mechanical behaviour of different devices for canine retraction. Dental Press J Orthod. 2012 May-June;17(3):83-7.

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