Journal Article

Photo‐elastic stress analysis of initial alignment archwires

Serene A. Badran, John F. Orr, Mike Stevenson and Donald J. Burden

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 25, issue 2, pages 117-125
Published in print April 2003 | ISSN: 0141-5387
Published online April 2003 | e-ISSN: 1460-2210 | DOI:
Photo‐elastic stress analysis of initial alignment archwires

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  • Restorative Dentistry and Orthodontics


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Photo‐elastic models replicating a lower arch with a moderate degree of lower incisor crowding and a palatally displaced maxillary canine were used to evaluate the stresses transmitted to the roots of the teeth by initial alignment archwires. Six initial alignment archwires were compared, two multi‐strand stainless steel wires, two non‐super‐elastic (stabilized martensitic form) nickel titanium wires, and two stress‐induced super‐elastic (austenitic active) nickel titanium wires. Three specimens of each archwire type were tested.

Analysis of the photo‐elastic fringe patterns, in the medium supporting the teeth, revealed that the non‐super‐elastic nickel titanium archwires produced the highest shear stresses (P = 0.001). However, the shear stresses generated by the super‐elastic alignment archwires and the multi‐strand stainless steel archwires were very similar (P = 1.00). These results show that even in situations where large deflections of initial alignment archwires are required, super‐elastic archwires do not appear to have any marked advantage over multi‐strand stainless steel alignment archwires in terms of the stresses transferred to the roots of the teeth.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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