Method: The data of patients with dentofacial deformities requiring surgical correction from 2003 to 2012 were obtained from the operation lists. Hospital records of 581 and 217 patients from Hong Kong and Glasgow were retrieved, respectively. Data collection included patients' demographics, diagnostic investigations, surgical management protocol, disciplines involved and complications.
Result: Patients from Hong Kong and Glasgow shared a similar mean age and gender ratio with class III facial deformity being most common. Each patient went through a standard preparation, including clinical assessment, dental models, radiographs, and 2-D photographs. In Glasgow, each patient had 3-D photographic and cone-beam CT planning whereas in Hong Kong, this was done in complex deformities. Both centres evaluated patients in joint orthognathic meetings with different specialists being incorporated. The postgraduates presented the patients' data, diagnosis and treatment plan. Psychological screening was done by both centres with questionnaire in Hong Kong and clinical psychologist interview in Glasgow.
In Hong Kong, over 95% of patients required bimaxillary osteotomies, with vertical subsigmoid osteotomy, lower anterior subapical osteotomy and segmental Le Fort I osteotomy commonly performed. 34 cases required distraction osteogenesis. In Glasgow, sagittal split osteotomy and non-segmental Le Fort I osteotomy were preferred. Distraction osteogenesis was performed in 1 case. Facial aesthetic surgeries were occasionally required. Both centres shared a similar complication profile.
Conclusion: Patients from Hong Kong and Glasgow were managed by a dedicated team and each patient went through a standard pre-surgical planning. More bimaxillary osteotomies and distraction osteogenesis were performed in Hong Kong with differing surgical techniques being preferred by the Glasgow team in addressing different deformities. Both centres shared a similar profile of post-surgical complications.