Current Research in Dentistry

Frictional Properties of Self-Ligating Brackets and Low-Friction Ligatures

Maria Francesca Sfondrini, Danilo Fraticelli, Federico Rosti, Andrea Scribante and Paola Gandini

DOI : 10.3844/crdsp.2012.1.6

Current Research in Dentistry

Volume 3, Issue 1

Pages 1-6


Problem statement: To evaluate the frictional forces generated by five different orthodontic brackets when used in combination with stainless steel and NiTi archwires in dry conditions at physiological temperature. Approach: Five different types of maxillary canine brackets (Damon 3 MX, Step, Quick, Sprint, Mini Mono) with a slot size 0.022 inch were coupled with 0.016” and 0.019”×0.025” stainless steel and with 0.016” and 0.018”×0.025” NiTi archwires. Step, Sprint and Mini Mono were used both with traditional ligatures and with Slide ligatures. A total of 320 archwires and brackets were used; ten tests were carried out for each group of bracket-wire combination at physiological temperature and in dry state. Frictional forces were measured by Instron Universal Testing Machine. The statistical significance level was established at P<0.05. Results: Damon 3 MX and Step brackets with Slide ligatures produced statistically lower friction than Quick and conventional brackets with elastomeric ligature. Frictional force increased proportionally to the wire size; NiTi archwires presented higher frictional resistance than stainless steel archwires. Slide ligatures showed lower fictional values in comparison with elastic ligatures. Conclusion: Stainless steel brackets with new Slide ligature show frictional forces similar to self-ligating brackets with passive clip.


© 2012 Maria Francesca Sfondrini, Danilo Fraticelli, Federico Rosti, Andrea Scribante and Paola Gandini. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.