| Load-deflection characteristics of superelastic and thermal nickel-titanium wires. | |
| | |
MedLine Citation:
|
PMID: 22023884 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
The aim of this study was to investigate the mechanical properties of superelastic and thermal nickel-titanium (NiTi) archwires for correct selection of orthodontic wires. Seven different NiTi wires of two different sizes (0.014 and 0.016 inches), commonly used during the alignment phase, were tested. A three-point bending test was carried out to evaluate the load-deflection characteristics. The archwires were subjected to bending at a constant temperature of 37°C and deflections of 2 and 4 mm.Analysis of variance showed that thermal NiTi wires exerted significantly lower working forces than superelastic wires of the same size in all experimental tests (P < 0.05). Wire size had a significant effect on the forces produced: with an increase in archwire dimension, the released strength increased for both thermal and superelastic wires. Superelastic wires showed, at a deflection of 2 mm, narrow and steep hysteresis curves in comparison with the corresponding thermal wires, which presented a wide interval between loading and unloading forces. During unloading at 4 mm of deflection, all wires showed curves with a wider plateau when compared with 2 mm deflection. Such a difference for the superelastic wires was caused by the martensite stress induced at higher deformation levels.A comprehensive understanding of mechanical characteristics of orthodontic wires is essential and selection should be undertaken in accordance with the behaviour of the different wires. It is also necessary to take into account the biomechanics used. In low-friction mechanics, thermal NiTi wires are to be preferred to superelastic wires, during the alignment phase due to their lower working forces. In conventional straightwire mechanics, a low force archwire would be unable to overcome the resistance to sliding. |
| | |
Authors:
|
Elda Gatto; Giovanni Matarese; Guido Di Bella; Riccardo Nucera; Chiara Borsellino; Giancarlo Cordasco |
Related Documents
:
|
16658014 - Involvement of ethylene in phytochrome-mediated carotenoid synthesis. 12232134 - Interactions between light and the circadian clock in the regulation of cat2 expression... 18523724 - Intracellular distribution of phototropin 1 protein in the short-day plant ipomoea nil. 17708894 - Light signal transduction in plants. 20499134 - Simultaneous recording of multifocal vep responses to short-wavelength and achromatic s... 19417794 - Driving superfluidity with photoassociation. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-10-23 |
Journal Detail:
|
Title: European journal of orthodontics Volume: - ISSN: 1460-2210 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
|
Created Date: 2011-10-25 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7909010 Medline TA: Eur J Orthod Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Departments of Orthodontics and Paediatric Dentistry and. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Periodontal tissue reaction during orthodontic relapse in rat molars.
Next Document: Morbidity and mortality of severe malnutrition among Sudanese children in New Halfa Hospital, Easter...