Skip Navigation


The European Journal of Orthodontics Advance Access originally published online on September 14, 2007
The European Journal of Orthodontics 2007 29(6):578-582; doi:10.1093/ejo/cjm068
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
29/6/578    most recent
cjm068v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Kasuya, S.
Right arrow Articles by Hirashita, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kasuya, S.
Right arrow Articles by Hirashita, A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2007. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

The effect of ligation on the load–deflection characteristics of nickel–titanium orthodontic wire

Shugo Kasuya*, Satoshi Nagasaka*, Ai Hanyuda*, Sadao Ishimura** and Ayao Hirashita*

* Department of Orthodontic, Tsurumi University School of Dental Medicine, Yokohama, Japan
** Laboratory of Mathematics, Tsurumi University School of Dental Medicine, Yokohama, Japan

Address for correspondence Shugo Kasuya, Department of Orthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Japan E-mail: kasuya-shugo{at}tsurumi-u.ac.jp


  Abstract

This study examined the effect of ligation on the load–deflection characteristics of nickel–titanium (NiTi) orthodontic wire. A modified three-point bending system was used for bending the NiTi round wire, which was inserted and ligated in the slots of three brackets, one of which was bonded to each of the three bender rods. Three different ligation methods, stainless steel ligature (SSL), slot lid (SL), and elastomeric ligature (EL), were employed, as well as a control with neither bracket nor ligation (NBL). The tests were repeated five times under each condition. Comparisons were made of load–deflection curve, load at maximum deflection of 2000 µm, and load at a deflection of 1500 µm during unloading. Analysis of Variance (ANOVA) and Dunnett's test were conducted to determine method difference ({alpha} = 0.05). The interaction between deflection and ligation was tested, using repeated-measures ANOVA ({alpha} = 0.05).

The load values of the ligation groups were two to three times greater than the NBL group at a deflection of 1500 µm during unloading: 4.37 N for EL, 3.90 N for SSL, 3.02 N for SL, and 1.49 N for NBL (P < 0.01). For the EL, a plateau region disappeared in the unloading curve. SL showed the smallest load. The ligation of the bracket wire may make NiTi wire exhibit a significantly heavier load than that traditionally expected. NiTi wire exhibited the majority of its true superelasticity with SL, whereas EL may act as a restraint on its superelasticity.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Eur J OrthodHome page
N. Pandis, T. Eliades, and C. Bourauel
Comparative assessment of forces generated during simulated alignment with self-ligating and conventional brackets
Eur J Orthod, December 1, 2009; 31(6): 590 - 595.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.