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KMID : 0361920120420040218
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Korean Journal of Orthodontics
2012 Volume.42 No. 4 p.218 ~ p.224
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In vitro evaluation of resistance to sliding in self-ligating and conventional bracket systems during dental alignment
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Cordasco Giancarlo
Giudice Antonino Lo
Militi Angela
Nucera Riccardo
Triolo Giuseppe
Matarese Giovanni
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Abstract
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Objective: To investigate the resistance to sliding (RS) in self-ligating and conventional ligation bracket systems at 5 different second-order bracket angulations by using low-stiffness alignment wires in a 3-bracket experimental model and to verify the performance of the main RS components in both systems when these wires are used.
Methods: Interactive self-ligating brackets with closed and open slides were used for the self-ligating (SL) and conventional ligation (CL) groups, respectively; elastomeric ligatures (1 mm inner diameter) were used in the latter system. The alignment wire used was 0.014 inch heat-activated NiTi (austenitic finish temperature set at 36°C by the manufacturer). A custom-made testing machine was used to measure frictional resistance. Tests were repeated 5 times at every angulation simulated. All data were analyzed statistically.
Results: The RS increased significantly with increasing angulation in both SL and CL groups (p < 0.0001). However, the RS values were significantly higher at every angulation (p < 0.0001) in the CL group.
Conclusions: Despite the relevance of the binding phenomenon, ligation forces predominantly affect the RS when low-stiffness alignment wires are used.
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KEYWORD
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Bracket, Wire
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