Journal Article

Effects of root morphology on stress distribution at the root apex

Koji Oyama, Mitsuru Motoyoshi, Masayuki Hirabayashi, Kohei Hosoi and Noriyoshi Shimizu

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 29, issue 2, pages 113-117
Published in print April 2007 | ISSN: 0141-5387
Published online April 2007 | e-ISSN: 1460-2210 | DOI:
Effects of root morphology on stress distribution at the root apex

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  • Restorative Dentistry and Orthodontics


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It is thought that the stress concentration at the root apex caused by orthodontic force induces root resorption. The purpose of this study was to investigate stress distribution at the root in cases of deviated root shapes using finite element models (FEMs). To clarify this, five three-dimensional FEMs divided by deviated root shape (normal, short, blunt, bent root apex, pipette shape) were constructed and, experimental orthodontic forces, applied in a vertical (intrusive) and horizontal (lingual) direction to the tooth axis.

In the short-root model, significant stress was concentrated at the middle of the root. The blunt-shaped root model showed no significant stress concentration at the root. In the models with a bent or pipette-shaped root, significant stress was concentrated at the root apex. During orthodontic force application, stress concentration was observed in the root of the models with short, bent, and pipette-shaped roots, indicating that attention must be paid to root shape during orthodontic treatment.

Journal Article.  2187 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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