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The European Journal of Orthodontics Advance Access originally published online on September 13, 2006
The European Journal of Orthodontics 2007 29(3):232-237; doi:10.1093/ejo/cjl035
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© The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

The craniofacial characteristics of osteogenesis imperfecta patients

Pei-Ching Chang*, Shiao-Yu Lin* and Kuang-Hung Hsu**

* Department of Pediatric Dentistry, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, Chang Gung University College of Medicine
** Laboratory for Epidemiology, Department of Health Care Management, Chang Gung University, Taoyuan, Taiwan

Address for correspondence Dr Shiao-Yu Lin, Department of Pediatric Dentistry, Chang Gung Children's Hospital, No. 5, Fu-Shing Street, Kuei Shan, Taoyuan 333, Taiwan, Republic of China. E-mail: pearl.pcchang{at}msa.hinet.net


  Abstract

The aim of this study was to identify the craniofacial characteristics of 16 osteogenesis imperfecta (OI) patients, 10 males and 6 females, aged 7–15 years. The control group comprised 863 Chinese children from 6 to 18 years of age. Eleven cephalometric reference points and 25 variables were measured on the lateral cephalometric radiographs. Cochrane's method of unequal variance t-test was used to differentiate the differences between two groups.

A Class III occlusal relationship was found in 62.5 per cent of the OI patients. The maxilla was more retrusive than the mandible in relation to the cranial base. Face heights, the effective maxilla and mandibular lengths, and anterior and posterior cranial base lengths were significantly shorter than the control subjects. The facial divergence, the cranial base (N-S-Ar, P < 0.001), and the gonial (Ar-Go-Gn, P < 0.001) angles were significantly enlarged, while the articular angle (S-Ar-Go, P < 0.001) was significantly reduced.

The findings showed that the OI patient had a more prominent Class III occlusal relationship, prognathic mandible, larger facial divergence, shorter face heights, defective sagittal growth of the maxilla and mandible, a flattened cranial base angle, impaired cranial base growth, and more forward counterclockwise rotation in mandibular growth compared with the controls.


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