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Journal of Orthodontics, Vol. 28, No. 1, 19-24, March 2001
© 2001 British Orthodontic Society

Clinical Section

A Case of Anterior Open Bite Developing During Adolescence

Kazuhiro Yamada, D.D.S., Ph.D.1, Yuusuke Satou, D.D.S.1, Kooji Hanada, D.D.S.1, Takafumi Hayashi2 and Jusuke Ito2

1 Departments of Orthodontics and
2 Oral and Maxillofacial Radiology, Niigata University Faculty of Dentistry, Japan

Kazuhiro Yamada, Department of Orthodontics, Faculty of Dentistry, Niigata University, 2-5274 Gakkocho-dori, Niigata 951-8514, Japan. Tel: +81-25-227-2906. Fax: +81-25-223-5230. E-mail: kazuhiro{at}dent.niigata-u.ac.jp

Abstract

Imaging studies have reported on the relationship between temporomandibular joint (TMJ) degeneration and facial deformity. These studies have suggested that mandibular growth is affected by TMJ degeneration, resulting in altered skeletal structure as mandibular retrustion. However, there are very few longitudinal case reports on TMJ osteoarthrosis (OA).

  Progressive open bite occurred in an adolescent patient with TMJ OA. Cephalometric analysis showed a downward and backward rotated mandible, and a labial inclination of the upper incisor. Magnetic resonance imaging showed internal derangement without reduction and erosion in the right and the left condyles. Although the cause of open bite is unclear in this case, tongue thrusting, and internal derangements in the temporomandibular joint were suspected as causes of the open bite.

Key words: Magnetic Resonance Imaging, Open Bite, Temporomandibular Joint Osteoarthrosis, Tongue Thrusting.




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[Abstract] [Full Text] [PDF]


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