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Craniofacial morphology of Japanese girls with Class II division 1 malocclusion
1Department of Orthodontics, Eastman Dental Institute for Oral Health Care Sciences, University College London, 256 Gray's Inn Road, London WC1X 8LD, UK. N.Ishii@eastman.ucl.ac.uk
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.