The Study On Female Soft Tissue Profile For Class â… , Class â…¡ And Class â…¢ Patients In Chongqing

The goal of malocclusion treatment is harmony,stable and aesthetic.The harmonious beauty of face and ideal soft tissue profile is the final orthodontist.It is also one of malocclusion treatment success standards. The study of lateral cepholometric radiograph has begun since 1930 in orthodontic. It is one of important methods for malocclusion diagnosis, design and research.It is close realationship about malocclusion and facial soft tissue.Facial soft tissue effect on malocclusion formation , therapeutic effect prediction , relapse and retain.Soft tissue profile is different for different race of people and different nation . It is also different for the same race of people and the same nation , but different region.Orthodontic clinical doctors have begun to pay more attention on lateral cepholometic radiogragh about soft tissue profile aesthetic . The soft tissue profile aesthetic research and article are becoming more and more.Many researches of Beijing , Xi an ,Shanghai, Hubei, Tianjing etc have reported the study on normal occlusion of children lateral cepholometric radiograph.Many scholars of Beijing , Guang dong,Fujian etc researched the people of their regions sbout different malocclusion soft tissue profile aesthetic . Howeve,until then the study on female soft tissue profile for class I , class II and class III malocclusion patients in Chongqing has not been reported .The measurement of facial soft tissue thickness carry out soft tissue profile analysis in orthodontic,appearance reconversion and reconstruction in forensic anthropology , cosmetic surgery renovation in facial soft tissue trauma etc.In those subjects , the measurement of facial soft tissue thickness has important in-service use value . There are many method to measure facial soft tissue thickness . To measure facial soft tissue we can use direct measurement,radiation measurement , ultrasohometry measurement etc. It is conventient and reliable with radiation measurement.Many scholars accept radiation measurement.Until then the study of facial soft tissue thickness in Chongqing orthodontic patients has not been reported.The study adopt typical portion soft tissue profile aesthetic index to research female orthodontic patients , analysis their soft tissue profile characters. The study also analysis the difference for different patientswith Angles classification of malocclusion .All experiment objects come from orthodontic department patients from 2005 to 2007.Their age is from 11 to 17 . Radomly select 30 class I malocclusion lateral cepholometric radiographs , 30 class II malocclusion lateral cepholometric radiographs , 30 class III malocclusion lateral cepholometric radiographs . The lateral cepholometric radiographs were traced on acetate sheets with shape 2B penciles.Landmarks were made and all kinds of indexs were measured . Every lateral cepholometric radiograph was measured twice . The measure values was taken average values . Tracing , landmark and measurement was accomplish by the same men in two months .All the soft tissue profile aesthetic indexs were described as mean±SD , student analysis of variance.were used in the coparation of paragroup with SAS package . There were differences when p<0.05 and significant difference when p<0.01.Campared with the data of class I malocclusion , for class II malocclusion there are significant differences in upper lip angle of inclination , upper lip length and Ns-Sn-Pos . The value of upper lip angle of inclination , upper lip length and Ns-Sn-Pos is smaller than those class I malocclusion . For class III malocclusion there are no significant differences in Ls-SGo,Li-SGo,upper lip length , lower lip length , Cm-Sn-Ls, upper lip angle of inclination and Li-H line . There are significant differences in lower lip angle of inclination , mentolabial sulcus angle , upper lower lip angle , H angle. The value of lower lip angle of inclination , mentolabial sulcus angle , upper lower lip angle is bigger than those class I malocclusion.But the value of H angle is smaller than class I malocclusion . Campared with the data of class II malocclusion , for class III malocclusion there are significant differences in LsL , LiL , lower lip angle of inclination , mentolabial sulcus angle , H angle , upper lower lip angle , Ns-Sn-Ls . For class III malocclusion the value of LsL is shoter than class II malocclusion , but the value of LiL is longer than class II malocclusion . The value of lower lip angle of inclination , mentolabial sulcus angle , upper lower lip angle is bigger than class II malocclusion . There are no significant differences in Ls-SGo,Li-SGo , Cm-Sn-Ls and Li-H line .Compared with the value of Ns-Sn-Pos , there is difference in class I , class II and class III . For class III the mean value of Ns-Sn-Pos is the biggest , but for class II it is the smallest.The difference of Ns-Sn-Pos is concordant for class I , class II and class III malocclusion craniofacial structural feature . To some extend the soft tissue pofile malocclusion skeleton relationship .Cranifacial soft tissue is not well-distibuted covering in the hard tissue . The soft tissue thickness is difference in different facial position . The basifacial soft tissue thickness is thicker than midface and facial superior part.Malocclusion facial soft tissue thickness difference concentrate on facial lower third . Campared with the facial soft tissue thickness of class I malocclusion , for class II malocclusion there are significant differences in subnasale . There are differences in upper lip and mentolabial sulcus. For class III malocclusion there are significant differences in lower lip and mentolabial sulcus. There are differences in subnasale . Campared with the facial soft tissue thickness of class II malocclusion , for class III malocclusion there are significant differences in lower lip. There are differences in subnasale and upper lip.