title: Evaluation of craniofacial proportions: A pilot study.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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 coefficient tests using SPSS 12 software, and the significance was set at 0.05. Then, a formula was suggested for predicting the relation between the jaws, cranium and face.
  
  
  RESULTS
  The variables measured in this study were significantly different between the genders (P < 0.05), except for Co-Gn (P = 0.055), and they were higher in boys. All variables significantly 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-APmax and the Co-Gn, anterior nasal spine-menton in the Iranian population.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Torabinejad Dental Research Center and Department of Orthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Saied
authors.initials: S
authors.lastname: Sadeghian
authors.affiliation: Department of Orthodontics, School of Dentistry, Islamic Azad University of Khorasgan, Isfahan, Iran.
authors.forename: Ali Mohammad Kalantar
authors.initials: AM
authors.lastname: Motamedi
authors.affiliation: Department of Orthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Haerian
authors.affiliation: Department of Orthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Elahe
authors.initials: E
authors.lastname: Rafiei
keywords: Analysis; cephalometry; orthodontics