Evaluation Cephalometric Norms in Iranian Adult Live in Ahvaz Using McNamara Analysis

Introduction: Today diagnosis and treatment planning in patients for orthodontic or surgical treatment is expected to correspond with the same ethnic cephalometric norms. This study aimed to determine the cephalometric norms of the Iranian population living in Ahvaz via McNamara's analysis and to verify the presence of gender related disparity and compare it with the standard norms and similar studies. Materials & Methods: Cephalograms of 79 patients (39 females, 40 males in the age range of 19-29 years old) were selected from the Orthodontic department of Ahvaz Dental School archive during 2018-2019. The subjects had a Class 1 molar relationship with a balanced profile, no history of orthodontic or surgical treatment or trauma, and no congenital anomalies. According to the McNamara analysis 8 linear and 4 angular measurements were traced manually and analyzed statistically by Shapiro-Wilk, independent t-test, and Mann-Whitney tests with a meaningful level of p value < 0.05. Results: According to our findings significant differences were observed in the effective length of the maxilla and mandible, Maxillo-mandibular differences, Distance point A from maxilla to chin from N perpendicular line, 1.3 lower face height (p value < 0.05) but not found in the upper and lower incisor position and facial axis and mandibular plane angle (p value > 0.05). Conclusion: Despite the differences observed in the cephalometric parameters with the normal range among Caucasians, McNamara's analysis was applicable for surgical and orthodontic treatment in Iranians.