smile line and occlusion: an epidemiological study

background:   materials and methods:   determine possible significances in the relation of smile line to angle occlusion class, overbite and overjet and arch form. a p   results:   conclusion:   and important relation between some occlusal parameters and smile design, which must be considered. within the limitations of such studies, it might be concluded that there is a significant chi-square test indicated that there was a significant difference between the smile design   and overbite, overjet and gender but no statistically significant association was found between the smile design and crossbite, molar angle classification and arch form. level of <0.05 was set as to be significant. in the present descriptive study, with 212 participants, included were   patients with no history of orthodontic treatment, loss or prosthetic replacement of anterior teeth, extracted teeth, lips with asymmetry or a history of trauma. chi-square test was used to the purpose of the present study was to discuss some new concepts of the key words: dental esthetics, occlusion, overbite, overjet, smile line desirable characteristics of smile tooth display. due to the increasing application of cosmetic dental treatments, there is an increasing need for better understanding of the esthetic principles.