<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec>
<h3>Objective</h3>
<p>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.</p>
</sec>
<sec>
<h3>Methods</h3>
<p>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.</p>
</sec>
<sec>
<h3>Results</h3>
<p>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 (<italic>p</italic> = 0.007). The frictional resistance to sliding fell when the wire was secured with either of these two methods and subjected to vertical displacement loads. There was no significant difference in the rate of wire movement between these modules.</p>
</sec>
<sec>
<h3>Conclusion</h3>
<p>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.</p>
</sec>
</abstract>

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 (p = 0.007). The frictional resistance to sliding fell when the wire was secured with either of these two methods and subjected to vertical displacement loads. There was no significant difference in the rate of wire movement between these modules.


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.

The influence of ligation on frictional resistance to sliding during repeated displacement

Australasian Orthodontic Journal

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...

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.