PMID: 8600008May 1, 1995Paper

Elastic responses to longitudinal torsion of single-strand, rectangular, orthodontic archwire segments

Dental Materials : Official Publication of the Academy of Dental Materials
R J Nikolai

Abstract

This study was undertaken to characterize elastic responses of orthodontic archwire segments in longitudinal torsion, to compare experimental results with predictions from structural engineering theory, and to examine the potential interaction between flexural and torsional responses of archwires. Passively straight and deflected rectangular wire segments were activated in torsion to states beyond their elastic limits. The wire parameters that were controlled included: the alloy, the cross-sectional size, and the gauge length. The research design included 48 cells and 240 separate tests. From torque-twist plots, values of elastic stiffness, elastic range, and unit elastic range were obtained. Raw experimental data were subjected to analyses of variance and means to a Tukey's post-hoc test. Mean stiffness and elastic range outcomes were compared with theoretical values. Most plots were generally characteristic of Hookean materials. All three wire parameters significantly influenced the three dependent variables; few statistical interactions emerged. Theoretical stiffness values were reasonably comparable to those obtained experimentally; however, the elastic range predictions were conservative. Torsion theory predicts unit elast...Continue Reading

References

May 1, 1977·American Journal of Orthodontics·C L Steyn
Feb 1, 1978·American Journal of Orthodontics·G F Andreasen, R E Morrow
Mar 1, 1986·American Journal of Orthodontics·M K Asgharnia, W A Brantley
Oct 1, 1986·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·S B IngramR J Smith
May 1, 1983·European Journal of Orthodontics·J Bachmann
Jul 1, 1984·American Journal of Orthodontics·J SebancJ P Conover
Aug 1, 1981·American Journal of Orthodontics·E RaphaelL Klapper
Jan 1, 1982·American Journal of Orthodontics·R L LangL Klapper
Sep 1, 1982·American Journal of Orthodontics·S R DrakeK Asgar

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Citations

Mar 13, 2001·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·T R Meling, J Odegaard
Jun 8, 2001·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·M SantoroT J Cangialosi

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