fa Smile line and occlusion: An epidemiological study پروتزهای دندانی Prothtodontics پژوهشي Research <b> Background:</b> The purpose of the present study was to discuss some new concepts of the 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.<div>  <b>Materials and Methods</b>: 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 determine possible signifcances in the relation of smile line to Angle occlusion class, overbite and overjet and arch form. A P level of <0.05 was set as to be signifcant. </div><div><b>Results:</b> Chi-square test indicated that there was a signifcant difference between the smile design and overbite, overjet and gender but no statistically signifcant association was found between the smile design and crossbite, molar Angle classifcation and arch form. </div><div><b>Conclusion:</b> Within the limitations of such studies, it might be concluded that there is a signifcant and important relation between some occlusal parameters and smile design, which must be considered</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Dental Research Journal </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://drj.mui.ac.ir/index.php/drj/article/view/1515/792" target="_blank"><font color="#0000ff">Full Text</font></a></p> Dental esthetics, occlusion, overbite, overjet, smile line 0 0 http://idai.ir/browse.php?a_code=A-10-32-3400&slc_lang=fa&sid=1 Mahsa Harati 100319475328460015620 100319475328460015620 No Craniomaxillofacial Research Center, Azad University Shahbaz Naser Mostofi sh_mostofi@yahoo. com 100319475328460015621 100319475328460015621 Yes Department of Fixed Prosthodontics, Tehran Dental Branch, Islamic Azad University Ezzatollah Jalallian 100319475328460015622 100319475328460015622 No Department of Fixed Prosthodontics, Tehran Dental Branch, Islamic Azad University