Clinical Application of Lower Third Molar Extraction in Correction of Skeletal Class III Malocclusion

Objective To study the clinical application of lower third molars extraction and treatment using MEAW in the patients of skeletal Class Ⅲ malocclusion. Methods Twelve patients of skeletal class Ⅲ malocclusion (male 5,female 7,age rang 14 ～18 years old,mean age 15.1). They were treated by MEAW technique after extraction of lower third molars,cephalometric films at the beginning and end of treatment were analyzed using cephalometric analysis. Results After treatment,all the patients reach nomal occlusion relationship,the cross bite of anterior tooth were corrected,and reach the normal overbite and overjet. The lower first molars were moved 2.6 mm posteriorly ,the lower incisors were moved 2.1 mm lingually,the angle of ANB were increased 1.0° degree. The difference has the value of statistics.Conclusion The treatment of MEAW technique after extraction of lower third molars,such conditions as growth and development decelerating,no dental crowding of the mandible ,inclination of open bite and moderate skeletal class Ⅲ malocclusion.