Comparative study of frictional forces generated by NiTi archwire deformation in different orthodontic brackets: In vitro evaluation

Gilberto Vilanova QUEIROZ, Rafael Yagüe BALLESTER, João Batista de PAIVA, José RINO NETO, Giselle Mara GALON

Introduction: The purpose of this study was to compare the frictional forces between 0.014-in NiTi wires (Aditek) with 4 mm horizontal deflection and brackets with different archwire ligation systems. Methods: Four types of self-ligating brackets (Damon MX, Easy Clip, Smart Clip and In- Ovation), a triple bracket (Synergy) and a twin bracket with 8-shaped ligature (Tecnident) were tested. Twin brackets with conventional elastomeric ligatures (Morelli) were used as control group. Tests were repeated 10 times for each bracket/archwire combination. Frictional forces were measured in an Instron universal tensile machine at 3 mm/minute speed and a total displacement of 6 mm. Statistical analysis comprised ANOVA and Dunnett’s multiple comparison post hoc test. Results: Deflection-induced frictional (DIF) forces increased in the following order: Synergy, Damon, 8-shaped Ligature, Easy Clip, In-Ovation, Smart-Clip and conventional ligatures. The differences among groups were significant, with the exception of the 8-shaped ligature groups which was equal to the Damon and Easy Clip groups. Conclusions: Compared to conventional ligatures, all ligation systems tested reduced frictional forces. However, such reduction varied according to the ligation system employed.

Keywords: Orthodontic brackets. Friction. Corrective Orthodontics.

How to cite: Queiroz GV, Ballester RY, De Paiva JB, Rino Neto J, Galon GM. Comparative study of frictional forces generated by NiTi archwire deformation in different orthodontic brackets: In vitro evaluation. Dental Press J Orthod. 2012 July-Aug;17(4):45-50.

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