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

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...

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Bibliographic Details
Published in:European journal of orthodontics 2007-12, Vol.29 (6), p.578-582
Main Authors: Kasuya, Shugo, Nagasaka, Satoshi, Hanyuda, Ai, Ishimura, Sadao, Hirashita, Ayao
Format: Article
Language:English
Subjects:
Dental Alloys - chemistry
Dentistry
Elasticity
Elastomers - chemistry
Friction
Humans
Materials Testing
Nickel - chemistry
Orthodontic Appliance Design
Orthodontic Brackets
Orthodontic Wires
Pliability
Stainless Steel - chemistry
Stress, Mechanical
Surface Properties
Titanium - chemistry
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Summary: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 (α = 0.05). The interaction between deflection and ligation was tested, using repeated-measures ANOVA (α = 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 
ISSN:0141-5387
1460-2210
DOI:10.1093/ejo/cjm068