Comparative study of friction between metallic and conventional interactive self-ligating brackets in different alignment conditions

Sérgio Ricardo JAKOB, Davison MATHEUS, Maria Cristina JIMENEZ-PELLEGRIN, Cecília Pedroso TURSSI, Flávia Lucisano Botelho do AMARAL

Objective: The aim of this study was to compare the friction between three bracket models: conventional stainless steel (Ovation, Dentsply GAC), self-ligating ceramic (In-Ovation, Denstply GAC) and self-ligating stainless steel brackets (In-Ovation R, Dentsply GAC). Methods: Five brackets were used for each model. They were bonded to an aluminum prototype that allowed the simulation of four misalignment situations (n = 10). Three of these situations occured at the initial phase (in which a 0.016-in nickel-titanium wire was used): 1. horizontal; 2. vertical; and 3. simultaneous horizontal/vertical. One of the situations occurred at the final treatment phase: 4. no misalignment (in which a 0.019 x 0.025-inch stainless steel rectangular wire was used). The wires slipped through the brackets and friction was measured by a Universal Testing Machine. Results: Analysis of variance followed by Tukey’s Test for multiple comparisons (α = 0.05) were applied to assess the results. Significant interaction (p < 0.01) among groups was found. For the tests that simulated initial alignment, Ovation® bracket produced the highest friction. The two self-ligating models resulted in lower and similar values, except for the horizontal situation, in which In-Ovation C® showed lower friction, which was similar to the In-Ovation R® metallic model. For the no misalignment situation, the same results were observed. Conclusion: The self-ligating system was superior to the conventional one due to producing less friction. With regard to the material used for manufacturing the brackets, the In-Ovation C® ceramic model showed less friction than the metallic ones.

Keywords: Orthodontic brackets. Friction. Esthetics.

How to cite: Jakob SR, Matheus D, Jimenez-Pellegrin MC, Turssi CP, Amaral FLB. Comparative study of friction between metallic and conventional interactive self-ligating brackets in different alignment conditions. Dental Press J Orthod. 2014 May-June;19(3):82-9. DOI: http://dx.doi.org/10.1590/2176-9451.19.3.082-089.oar

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