In vitro evaluation of resistance to sliding in self-ligating and conventional bracket systems during dental alignment
Cordasco Giancarlo, Giudice Antonino Lo, Militi Angela, Nucera Riccardo, Triolo Giuseppe, Matarese Giovanni,
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( Cordasco Giancarlo ) - Messina University School of Dentistry Department of Orthodontics
( Giudice Antonino Lo ) - Messina University School of Dentistry Department of Orthodontics
( Militi Angela ) - Messina University School of Dentistry Department of Orthodontics
( Nucera Riccardo ) - Messina University School of Dentistry Department of Orthodontics
( Triolo Giuseppe ) - Messina University School of Dentistry Department of Orthodontics
( Matarese Giovanni ) - Messina University School of Dentistry Department of Orthodontics
KMID : 0361920120420040218
Abstract
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.
키워드
Bracket;Wire
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