Journal Article

The effects of increasing the reverse curve of Spee in a lower archwire examined using a dynamic photo-elastic gelatine model

PM Clifford, JF Orr and DJ Burden

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 21, issue 3, pages 213-222
Published in print June 1999 | ISSN: 0141-5387
Published online June 1999 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/21.3.213
The effects of increasing the reverse curve of Spee in a lower archwire examined using a dynamic photo-elastic gelatine model

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This paper describes the development and testing of a dynamic in vitro photo-elastic model for evaluating the effects of orthodontic mechanics on an entire arch of teeth. A model of a mandibular arch was made and the teeth were embedded in a gelatine material with a high level of mechanical creep which permitted tooth movement in response to orthodontic forces. The excellent photo-elastic properties of this material also facilitated the analysis of the stress distribution around the roots of the teeth. The model of a mandibular arch was used to investigate the tooth movements and stress distributions produced by increasing the reverse curve of Spee in a 0.018 x 0.025-inch stainless steel archwire.

The results revealed that a 1-mm reverse curve of Spee increased the arch length by 1.6 mm, but increasing the reverse curve of Spee to 5 mm did not increase arch length further. Photo-elastic analysis showed an increased stress distribution around the roots of the incisors and molars as the reverse curve of Spee was increase in the archwire.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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