The influence of ligation on frictional resistance to sliding during repeated displacement
Published Online: Dec 13, 2023
Page range: 141 - 146
Received: Jul 01, 2006
Accepted: Aug 01, 2006
DOI: https://doi.org/10.2478/aoj-2006-0015
© 2006 Nathawut Sirisaowaluk et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Objective
To determine if the type of ligation influences the frictional resistance between stainless steel wire and brackets when the wire is subjected to repeated vertical displacements.
Methods
Eight different types of ligation were used to secure a length of stainless steel wire in three stainless steel twin brackets. The wire was subjected to repeated vertical displacements in a simulated extraction space. Eighty per cent of the minimum force required to overcome static friction (F-m) between the wire and brackets was applied to the wire for eight minutes and any sliding measured.
Results
Frictional resistance to sliding was least when stainless steel ligatures twisted in a figure 8 pattern until taut then untwisted one quarter turn were used, and greatest when elastomeric modules in a figure 8 pattern (EM8) were used. The F-m difference between fully engaged standard and Super Slick elastomeric modules was significantly different (
Conclusion
Repeated vertical displacement reduced the frictional resistance to sliding for all methods of ligation except EM8. The stainless steel twist ligatures demonstrated the lowest frictional resistance to sliding.