Comparative study on aesthetic indicators of facial profile between the patients with skeletal Class ⅡandⅠmalocclusion before and after the extraction treatment
Abstract：Objective To compare the difference in aesthetic indicators of facial profile between the patients with skeletal Class Ⅱand Ⅰmalocclusion before and after the extraction treatment .Methods The samples consist of 53 patients(27 with skeletal Class Ⅱ division Ⅰ malocclusion,and 26 with skeletal Class Ⅰ bimaxillary protru-sion) .Every patient were corrected by straight wire appliance and each of them were extracted four premolars .Later-al cephalograms taken before and after the treatment were evaluated to determine the difference in aesthetic indicators of facial profile .Results The patients with class Ⅱmalocclusion showed significant changes in the angle of inclina-tion of upper lip ( A′Ls-FH) , the angle of inclination of chin ( Pg′B′-FH) , Z angle and the angle of protrusion of pro-file( G-Sn-Pg′) after the treatment ( P<0.01 ) .The patients with class Ⅰ showed significant changes in A′Ls-FH, Pg′B′-FH and Z angle after the treatment ( P<0.01 ) .There was significant difference before and after treatment in Z angle and G-Sn-Pg′between the two groups .But there was no significant changes in NsPg′-FH either intra-group or inter-groups before and after treatment ( P>0.05 ) .Conclusion The facial profile of patients with skeletal Class Ⅱand Ⅰ malocclusion can be affected by the extraction treatment .The main difference in profile between the two groups occurred in the region of soft chin .NsPg′-FH is not a sensitive indicator to determine the profile changes for the patients with skeletal Class ⅡandⅠmalocclusion.
Keywords：Lateral facial profileSoft tissueAestheticsMalocclusion
Publication Date：2013-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 1135-1137 )