Craniofacial morphology of Japanese girls with Class II division 1 malocclusion.
OBJECTIVE
To identify the craniofacial features of Japanese girls with Class II division 1 malocclusions.


METHODS
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).


CONCLUSIONS
Japanese girls with Class II division 1 malocclusion had a high-angle facial pattern associated with the short mandibular ramus.
Ishii
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N
Department 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
Deguchi
T
T
Hunt
N P
NP
D000293:Adolescent; D000704:Analysis of Variance; D016022:Case-Control Studies; D002508:Cephalometry; D016009:Chi-Square Distribution; D002648:Child; D005260:Female; D006801:Humans; D007564:Japan; D007574:Jaw Relation Record; D008312:Malocclusion, Angle Class II / Q000473:pathology*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D011856:Radiographic Image Enhancement; D015203:Reproducibility of Results; D019291:Skull Base / Q000473:pathology