The effect of orthodontic clinical use on the mechanical characteristics of nickel-titanium closed-coil springs.
Nickel-titanium closed-coil springs
force degradation
mechanical properties
pseudoelasticity
Journal
The Journal of international medical research
ISSN: 1473-2300
Titre abrégé: J Int Med Res
Pays: England
ID NLM: 0346411
Informations de publication
Date de publication:
Feb 2019
Feb 2019
Historique:
pubmed:
9
1
2019
medline:
14
6
2019
entrez:
9
1
2019
Statut:
ppublish
Résumé
To examine the effect of clinical use on both force retention and the deactivation of closed-coil nickel-titanium (NiTi) springs in a 16-week trial. The force-activation curves for NiTi springs were determined before and after clinical use. The rate of tooth movement and maximum force (MF), hysteresis between activation and deactivation, and mean force of the deactivation plateau (MDF) were examined and correlated as a function of 4, 8, 12 and 16 weeks of clinical use. To recover the force properties, the springs were heat treated at 100°C and the results were compared with the preceding data. A total of 36 springs were analysed. The MF loss after use was 60, 74, 55, and 48 g for the 4-, 8-, 12- and 16-week springs, respectively. Heat treating had little effect on the MF. Clinical use lowered hysteresis by a mean of 180 g*mm compared with the pre-clinical use data, and heat treating increased the hysteresis by a mean of 59 g*mm above the post clinic testing data. The MDF was nominally 100 g less than the MF. Teeth moved approximately 1 mm/month, independent of the force loss. The loss of MF and the lowering of the MDF was not time dependent. Heat treating can partially recover the mechanical properties of the used springs.
Identifiants
pubmed: 30616411
doi: 10.1177/0300060518811765
pmc: PMC6381489
doi:
Substances chimiques
Dental Alloys
0
Nickel
7OV03QG267
Titanium
D1JT611TNE
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
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