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The European Journal of Orthodontics Advance Access originally published online on July 21, 2009
The European Journal of Orthodontics 2009 31(6):613-619; doi:10.1093/ejo/cjp043
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© The Author 2009. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

A cross-sectional study on the relationship between craniofacial morphology and the coronoid process

Takahiro Torisu*, Kazuhiro Yamada**, Tadao Fukui*, Masaki Yamaki*, Junichi Nakamura* and Isao Saito*

* Division of Orthodontics, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata
** Department of Orthodontics, School of Dentistry, Matsumoto Dental University, Shiojiri, Nagano, Japan

Address for correspondence Takahiro Torisu, Division of Orthodontics, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan, E-mail: toritaka{at}dent.niigata-u.ac.jp


  Abstract

Although there have been some reports on the relationship between craniofacial morphology and the activity of the temporal muscle attached to the coronoid process, such relationship is still unclear. The aim of the present study was therefore to investigate the relationship between the coronoid process and overall craniofacial morphology using lateral cephalograms of 60 female subjects (mean age 9.6 years) without mandibular deviation. Statistical testing was undertaken using stepwise regression analysis.

Anterior coronoid marginal depth correlated negatively (r = 0.71) with gonial angle, SNA, and overjet. The coronoid angle also correlated negatively (r = 0.86) with both the vertical and horizontal lengths from sella to the coronoid tip as well as with the horizontal length from sella to the posterior ramus margin. Furthermore, the coronoid length correlated positively (r = 0.61) with the coronoid angle and the anterior coronoid marginal depth. The coronoid width was also positively (r = 0.69) correlated with overbite.

Coronoid process morphology is related not only to mandibular morphology and position but also to maxillary position and the dental relationship in the anterior region. It therefore seems clear that coronoid process morphology might be related to temporal muscle functioning and its associated craniofacial morphological measurements.


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