Camouflage Treatment Of Skeletal Class Ⅲ Malocclusion Adult Patients With Different Facial Vertical Skeletal Patterns

Objective: The aim of this study is to compare dental,skeletal and soft tissue changes pre and post orthodontic camouflage therapy in adult patients with skeletal class Ⅲ malocclusion.Patients were divided into two groups,normal mandibular plane angle and high mandibular plane angle.To examine the occlusal relationship and discuss the therapeutic effect of camouflage therapy on skeletal class Ⅲ malocclusion,and provide guidance for clinic treatment.Methods: 34 adult patients were selected,16 female patients and 18 males,age 18-31 years.Lateral cephalometric measurements showed skeletal class Ⅲ.The relationship of canines and first molars were distal,Angle class Ⅲ anterior crossbite.No obvious facial asymmetry.Based on FMA value,patients were divided into 2 groups,high mandibular plane angle(FMA≥28°)16 cases and normal mandibular plane angle(FMA 22 to 28 °)18 cases.Imaging data before and after treatment,paired sample t test and independent sample t text were conducted using SPSS23.0 software.Changes in soft and hard tissues of the two groups of patients before and after treatment were compared to evaluate the effect of treatment.Results: After treatment,SNA and FMA were not significantly changed in both groups(p> 0.05).As SNB decreased,ANB increased,Wits increased and APDI decreased,the above changes had statistical significance.After treatment,the angle and distance from upper anterior teeth to NA plane were increased,while the angle and distance form lower incisors to NB plane were decreased.The above changes were statistically significant in the average angle group,while the changes in distance form lower incisors to NB plane were not statistically significant in the high angle group,but the rest were statistically significant.Before treatment,the SNB value of patients in the average angle group was greater than that in the high angle group,the ANB value was less than that in the high Angle group,and the distance form lower incisors to NB plane was less than that in the high Angle group(p<0.01),and the difference was statistically significant.There was no difference in other measurements.After treatment,the SNB value of patients in the average angle group was greater than that in the high angle group,the ANB value was less than that in the high angle group,the APDI value was greater than that in the high angle group,the distance form lower incisors to NB plane was less than that in the high angle group,and the Z Angle was greater than that in the high angle group(p<0.01),and the difference was statistically significant.There was no difference in other measurements.Conclusion:1.The ideal orthodontic results can be obtained in skeletal class Ⅲ adult patients with camouflage therapy.2.Skeletal disharmony is more obvious in patients with skeletal Class Ⅲ normal angle,which requires more lingual movement of lower anterior teeth.