Cephalometric for Orthognathic Surgery (COGS) for Bangladeshi Population

Objectives: To establish hard tissue cephalometric norms for orthognathic surgery (COGS) for Bangladeshi adults and to compare their mean differences with the established values of Caucasian COGS norms. Materials and Methods: The study sample consisted of 100 standardized lateral cephalometric radiographs of Bangladeshi adult including 50 males and 50 females with an average age of 20 years were studied. The criteria of selection were Class I normal occlusion, no skeletal abnormality or deformity, and no previous orthodontic treatment. All cephalometric landmarks were located and determined and subsequently all measurements were done according to COGS analysis. Results: Of the 23 measurements, 15 were highly significantly different between the sexes whereas 2 were insignificant. Mean established values according to COGS analysis were also presented to show the differences with the Bangladeshi adults. Bangladeshi males and females had significant differences in most of the cephalometric measurements; males had larger measurements than females in almost all variables. Conclusion: This study may be valuable in providing specific COGS in diagnosis and treatment planning for orthognathic surgery for Bangladeshi adults.