J. Orthod.
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Journal of Orthodontics, Vol. 28, No. 3, 211-216, September 2001
© 2001 British Orthodontic Society

Scientific Section

Craniofacial Morphology of Japanese Girls with Class II Division 1 Malocclusion

Nobuyuki Ishii1, Toshio Deguchi2 and Nigel P. Hunt3

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

Abstract

Objective: To identify the craniofacial features of Japanese girls with Class II division 1 malocclusions.

Method: One hundred and ninety lateral cephalometric radiographs were analysed, and the subjects whose age ranged from 7 years 6 months to 15 years 10 months were divided into three groups by their dentition: middle mixed dentition, late mixed dentition, and early permanent dentition. The mean values of 5 linear and 16 angular cephalometric parameters were compared with established Japanese Class I control values.

Results: Japanese girls with Class II division 1 malocclusion had a significantly small S-N-B angle (p < 0•001), short mandibular ramus (p < 0•05–0•001), and a large mandibular plane angle (p < 0•05–0•001).

Conclusion: Japanese girls with Class II division 1 malocclusion had a high-angle facial pattern associated with the short mandibular ramus.

Key words: Angle Class II Malocclusion, Computer-aided Cephalogram, Japanese Adolescents, Skeletal Class II.

Notes

E-mail: N.Ishii{at}eastman.ucl.ac.uk






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