Soft tissue analysis has been proposed by many authors as a reliable guide in treatment planning. Thus establishing population norms is an important issue in orthodontic treatment. The aim of this study was to determine the mean values of some of the soft tissue facial traits in Iranian subjecsts as determined by Bergman. Lateral cephalograms of 120 Iranian subjects (60 males and 60 females) in five age groups (n= 24) with well balanced face and normal occlusion were used.statistical analyses were done by means of unpaired student’s t-test and one way AOVA. The associations of variables with age and also with each other were assessed using Pearson’s correlation coefficient. The norms valuesfor Iranian subjects differ from those of Bergman in upper and lower lip thicknesses, facial profile angle and upper lip length (in males).sexual dimorphism was determined in lower facial height, upper lip length, upper lip thickness and lower lip thickness. All of the variables were significantly correlated with age except for facial profile angle. Iranian norms differ from those of other population which are usually used. Therefore, when
planning a treatment for this population their own norms should be employed.
Keywords: Soft tissue, cephalometry, Iranian, Norms