The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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In vitro evaluation of resistance to sliding in self-ligating and conventional bracket systems during dental alignment

  • Cordasco, Giancarlo (Department of Orthodontics, School of Dentistry, University of Messina) ;
  • Giudice, Antonino Lo (Department of Orthodontics, School of Dentistry, University of Messina) ;
  • Militi, Angela (Department of Orthodontics, School of Dentistry, University of Messina) ;
  • Nucera, Riccardo (Department of Orthodontics, School of Dentistry, University of Messina) ;
  • Triolo, Giuseppe (Department of Orthodontics, School of Dentistry, University of Messina) ;
  • Matarese, Giovanni (Department of Orthodontics, School of Dentistry, University of Messina)
  • Received : 2011.01.02
  • Accepted : 2012.05.31
  • Published : 2012.08.30
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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 $36^{\circ}C$ 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 lowstiffness alignment wires are used.

Keywords

References

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