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  • Title: Effects of deflection and archwire dimension on the mechanical performance of two self-ligating orthodontic systems.
    Author: Contardo L, Perinetti G, Ceschi M, Vidoni G, Antoniolli F, Castaldo A, Di Lenarda R.
    Journal: Prog Orthod; 2012 May; 13(1):2-9. PubMed ID: 22583581.
    Abstract:
    OBJECTIVES: To analyze the effects of archwire deflection and dimension on the mechanical performance of two self-ligating systems, as passive and active ligation designs. MATERIALS AND METHODS: An experimental model was used that was designed to resemble the full dental arch and to allow vertical displacement of a canine element. Two self-ligating systems were investigated: 1) a passive system; and 2) an active system, both in combination with three thermoactive NiTi archwires, with round sections of 0.014-in, 0.016-in and 0.018-in. The full loading-unloading cycles consisted of either 3mm or 6mm maximum deflection, performed at 37 °C. During unloading, the deactivation forces and energy were recorded. The ratio between the deactivation and activation energies was used as representative of the mechanical efficiencies of the systems. RESULTS: The deactivation force increased in combination with larger archwires and greater deflection. The deactivation energy increased in combination with larger archwires only for the 3-mm deflection cycle, while for the 6-mm deflection cycle, the deactivation energy was not influenced by the archwire dimension, and was not greater than that of the 3-mm deflection cycle. The mechanical efficiency decreased in combination with greater deflection and larger archwires, with a maximum decrease of about 12%. Only minor comparative differences were seen between the systems. CONCLUSIONS: The deflection degree and archwire dimension have large effects on the mechanical performance of self-ligating systems.
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