Evaluation of Load-deflection Rate Changes of Nickel-titanium Wire after Single Clinical Application in Three Different Crowdings

Basafa, Mohammad and Zebarjad, SeyedMojtaba and Narimani, MohammadAmin (2008) Evaluation of Load-deflection Rate Changes of Nickel-titanium Wire after Single Clinical Application in Three Different Crowdings. Journal of Mashhad Dental School, 32 (1). pp. 1-10.

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Abstract

Introduction: Desired mechanical properties of nickel-titanium wires have resulted in some orthodontists to recycle these wires and apply them repeatedly. The aim of this study was to evaluate load-deflection changes of nickel-titanium wires after single clinical application in three different types of crowding. Materials & Methods: 80 nickel-titanium wires (Global trade mark) with 0.014 inch diameter were randomly divided into four groups as: control, mild, moderate and severe crowding. Wires were used in patients for a period of 6±1 weeks Then, load-deflection experiment, using Zwick machine was done. Data were analyzed by Hottelling, Fisher’s exact and Duncan tests. Results: Hottelling analysis showed a significant difference between the groups. Fisher’s exact test showed that there was a significant difference between forces at 0.5, 1.0, 1.5, 2, 2.5 mm deflection loading and unloading but there was no significant difference in 3 mm loading deflection. Conclusion: This study showed that although single application of nickel-titanium wire (at least for the wire used in this study) for one orthodontic visit causes significant decrease in force levels in different types of crowding, residual force after single clinical application is still enough for repeated clinical application. Key words: Nickel-titanium wire, Load-deflection rate, Crowding, Clinical study.

Item Type: Article
Subjects: WU Dentistry. Oral surgery
Divisions: Journals > Journal of Mashhad Dental School
Depositing User: jmds jmds
Date Deposited: 24 Sep 2017 13:09
Last Modified: 24 Sep 2017 13:09
URI: http://eprints.mums.ac.ir/id/eprint/3186

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