Evaluation of craniofacial proportions: A pilot study

Regarding the need for determining the cephalometric norms for each population and the advantages of proportional analyses, we evaluated the variables of McNamara and Schwartz analyses and their relation in a pilot study on 6-17 years old Iranian students and provided formulas, which show these relations. In this descriptive-analytical study, a tatal of cephalometric radiographs from the archive documents of Orthodontic Department of Isfahan Dental School was selected and traced. The variables of McNamara and Schwartz analyses were investigated. The data were analyzed by t-test and linear regression and Spearman correlation coeffi cient tests using SPSS 12 software, and the signifi cance was set at 0.05. Then, a formula was suggested for predicting the relation between the jaws, cranium and face. The variables measured in this study were signifi cantly different between the genders (P < 0.05), except for Co-Gn (P = 0.055), and they were higher in boys. All variables signifi cantly increased (P < 0.05) with age from 6 to 17 years. The formulas presented in this study can be used for calculating the amount of PNS-APmax, Go-APman and the Co-Gn, anterior nasal spine-menton in the Iranian population. Within the limitation of this study, the formula presented in this study might be considered to predict the relation between jaw dimensions and cranial base and facial dimensions in the Iranian population.