The Study Of Soft And Hard Tissue Changes Before And After Non-extraction Orthodontic Treatment In AngleⅡ~2 Adults

Objective:To investigate the soft and hard tissue profile changes in AngleⅡ~2 adults before and after orthodontic treatment,thus to provide theoretical basis for clinical diagnosis and treatment of these type of patients.Methods:From patients with ClassⅡdivision 2 malocclusion,between 2013 and2016 to Shenyang Stomatology Hospital Orthodontics for treatment,randomly selected 16 Adult patients(eight cases each for men and women)that have been treated end through non-extraction orthodontic treatment,The average age was 23.5±4.13 years old.Using the American Dentsply ORTHORLIX,S-type panoramic X-ray machine,under strict head positioning locator,taken X-ray film.And X-ray Cephalometric were measured by the author myself in a certain period of time,The data were analyzed by SPSS20.0 statistical software,P <0.05 was considered statistically significant.By making the comparison to the normal occlusion group,the changes before and after the orthodontic treatment in ClassⅡdivision 2 malocclusion adults group,to find out the differences of the soft and hard tissue in these group.Then to provide the theoretical basis for clinical diagnosis and treatment of these type of patients.Results: Compared with normal adults,the measurements in ClassⅡdivision 2malocclusion adults show that: the difference between the SNA angle,the angle of the L1-MP plane was not statistically significant.SNB angle,SN-MP angle,MP-FHangle,the distance of ANS-Me and the percentage of ANS-Me/N-Me were less than the normal,with statistically significant difference(P<0.05).U1-NA angle,U1-SN angle,the distance of U1-AP and L1-NB were less than the normal,with statistically significant difference(P<0.05).ANB angle,U1-L1 angle,Y-aix angle and the distance of Po-NB were larger than the normal,with statistically significant difference(P<0.05).Soft tissue measurements show that nasolabial angle(Cm-Sn-UL)and the distance of Si-Ul,B’-H,Pg-Pg’ were larger than the normal,the distance of UL-E,LL-E were less than the normal with statistically significant difference(P<0.05).There is no significant difference between the angle of Z and normal occlusion.The SNB angle of class II Division 2 patients had no significant difference after Orthodontic treatment,but the study found that in some of the patients the SNB angle were decreased but the others were increased after the treatment,although the ANB angle was decreased but there was no statistical difference(P > 0.05).SNA angle,U1-L1 angle,and the distance of U1A-PP,L1A-MP were less than the normal,with statistically significant difference(P<0.05).The angle of U1-NA,U1-SN,L1-NB,L1-MP,Y-axis and the distance of U1-AP were increased,the difference was statistically significant(P < 0.05).There is no significant difference between the angle of MP-SN and MP-FH,the distance of ANS-Me,UM-PP,LM-PPand the percentage of ANS-Me/N-Me,although they were increased.After the treatment,the changes in soft tissue are as follows: the distance of LL-E was increased,and the difference has statistical significance.the distance of B’-H and Si-Ul decreased,and the difference was statistically significant(P < 0.05).There was no difference between the Nasolabial angle Cm-Sn-UL and the distance of UL-E 、Pg-Pg’、Po-NB and the difference was not statistically significant(P > 0.05).Conclusion: 1.The adult patients’ upper incisors of Angle Class II Division 2 has obvious tongue to tilt feature and skeletal Class II low angle,the anterior teeth showed bony atresia of deep overbite occlusion,so it advocates early treatment;The Angle Class II Division 2 malocclusion has better soft tissue profile and bite,while the nose,lip and chin also have better harmonious relationship,but the special clinical feature is the highlip line.2.By extraction treatment,AngleⅡ~2 Adults can achieve significant improvement in teeth occlusion and jaw vertical dimension.And the improvement in adult patients is mainly achieved by dental effects,the skeletal and soft tissue reconstruction is weak.Suitable nasolabial angle and good lip and chin morphology plays an important role in the facial aesthetics,the orthodontic doctors need more about concerned on the soft tissue morphology before and after the treatment.