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Morphology of the Temporomandibular Joint in Skeletal Class III Symmetrical and Asymmetrical Cases: a Study by Cephalometric Laminography

Department of Orthodontics, Matsumoto Dental University School of Dentistry, 1780 Gohbara-Hirooka, Shiojiri city, Nagano-ken, Japan 399-0781
Department of Orthodontics, Eastman Dental Institute for Oral Health Care Sciences, University College London, 256 Gray's Inn Road, London WC1X 8LD, UK

Toshio Deguchi, International Centre for Excellence in Dentistry, Eastman Dental Institute for Oral Health Care Sciences, University College London, 123 Gray's Inn Road, London WC1X 8TZ, UK. Tel: +44(0)20-7-905-1219. Fax: +44(0)20-7-242-8685. E-mail: deguchi{at}po.mdu.ac.jp.

Abstract

The aetiology of asymmetric growth in the mandible is not well understood. Previous studies have indicated that the functional lateral shift of the mandible in the period of prepubertal growth may translate to a true skeletal asymmetry, exclusively in skeletal Class III malocclusion. This asymmetry develops more characteristic features during the pubertal and post-pubertal growth periods. Early correction of a functional lateral shift of the mandible is recommended. The purpose of this study was to examine the relationship between the morphology of the temporomandibular joints and asymmetry in skeletal Class III malocclusion in adult female patients.

Cephalometric and laminographic findings in 36 asymmetric skeletal Class III patients with a lateral shift of mandible (group 3) were compared to those of 25 symmetric skeletal Class I patients (group 1) and the same number of symmetric skeletal Class III malocclusions (group 2). All the patients had received no orthodontic treatment. The results showed that the TMJ of the side to which the mandible shifted showed a significantly narrower and shorter shape of the condyle head, smaller superior condylar space, and steeper eminence than those of the unshifted side.

Key words: Asymmetry, Laminography, Skeletal I, Skeletal III, TMJ

Notes

^* Present address: International Centre of Excellence in Dentistry, Eastman Dental Institute for Oral Health Care Sciences, University College London, 123 Gray's Inn Road, London WC1X 8TZ, UK

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