This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Van Spronsen, P.H. Articles by Van Ginkel, F.C. Search for Related Content PubMed PubMed Citation Articles by Van Spronsen, P.H. Articles by Van Ginkel, F.C. Social Bookmarking                         What's this?

A Comparison of Jaw Muscle Cross-sections of Long-face and Normal Adults

Department of Orthodontics, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, 1081 HV Amsterdam, The Netherlands

W.A. Weijs

Department of Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA), Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands

J. Valk

Department of Radiology and Neuroradiology, Free University Hospital Amsterdam, The Netherlands

B. Prahl-Andersen

Department of Orthodontics, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, 1081 HV Amsterdam, The Netherlands

F.C. Van Ginkel

Department of Orthodontics, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, 1081 HV Amsterdam, The Netherlands

Long-face subjects have smaller maximum molar bite forces than do normal individuals. This has been attributed both to differences in moment arms and size of the jaw muscles.

In this study, a comparison was made between the mid-belly cross-sectional areas of the jaw muscles of 13 long-face and 35 normal adults by means of serial MRI scans. The subjects were selected on the basis of anterior lower face height as a percentage of anterior total face height. These and other cephalometric variables were measured from lateral radiographs.

In the long-face group, the cross-sectional areas of the masseter, medial pterygoid, and anterior temporal muscles were, respectively, 30%, 22%, and 15% smaller than in the control group. By a discriminant analysis and a multivariate analysis of variance, these differences were found to be significant (p < 0.001).

The findings of this study hint that differences in the sizes of the jaw muscles of long-face and normal subjects might explain, in part, the observed differences in maximum molar bite force.

Journal of Dental Research, Vol. 71, No. 6, 1279-1285 (1992)
DOI: 10.1177/00220345920710060301


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				T. Grunheid, G. E. J. Langenbach, J. A. M. Korfage, A. Zentner, and T. M. G. J. van Eijden The adaptive response of jaw muscles to varying functional demands Eur J Orthod, December 1, 2009; 31(6): 596 - 612. [Abstract] [Full Text] [PDF]

				S. W. Kusumah, S. Suzuki, K. Itoh, R. Higashino, N. Ohbayashi, T. Kurabayashi, and K. Moriyama Morphological observation of the medial pterygoid muscle by the superimposition of images obtained by lateral cephalogram and MRI J. Orthod., October 1, 2009; 36(4): 243 - 252. [Abstract] [Full Text] [PDF]

				T. Matsuyuki, T. Kitahara, and A. Nakashima Developmental changes in craniofacial morphology in subjects with Duchenne muscular dystrophy Eur J Orthod, February 1, 2006; 28(1): 42 - 50. [Abstract] [Full Text] [PDF]

				M.C. Raadsheer, T.M.G.J. van Eijden, F.C. van Ginkel, and B. Prahl-Andersen Contribution of Jaw Muscle Size and Craniofacial Morphology to Human Bite Force Magnitude Journal of Dental Research, January 1, 1999; 78(1): 31 - 42. [Abstract] [PDF]

				P.H. van Spronsen, W.A. Weijs, E. van Ginkel, and B. Prahl-Andersen Jaw Muscle Orientation and Moment Arms of Long-face and Normal Adults Journal of Dental Research, June 1, 1996; 75(6): 1372 - 1380. [Abstract] [PDF]

				K. Kasai, L.C. Richards, E. Kanazawa, T. Ozaki, and T. Iwasawa Relationship Between Attachment of the Superficial Masseter Muscle and Craniofacial Morphology in Dentate and Edentulous Humans Journal of Dental Research, June 1, 1994; 73(6): 1142 - 1149. [Abstract] [PDF]