I급 부정교합자에서 발치와 비발치를 통한 교정치료 전·후의 입술위치 변화

Lips Variation of Pre. and Post Treatment Through the Extraction or Non-Extraction Groups of Class I Malocclusion

This study targeted 36 people in case reports with non-extraction that was completed the orthodontic treatment with non-extraction in Class I malocclusion patients and 48 people in case reports with extraction that was completed the orthodontic treatment with premolar extraction treatment. It classified it again into adults and adolescents, measured Lateral Cephalogram before and after treatment, and then comparatively observed a change in Lip and perioral soft tissue according to the movement of anterior teeth. Hence, the following results were obtained. 1. As for IMPA, U1 to FH, E line, the upper and lower lips were reduced figure regardless of adolescents and adults. Thus, the aesthetic facial profile was indicated to have been improved. 2. A change in the upper and lower lips on E line in the non-extraction group was increased in adults and decreased in adolescents. Thus, the improvement in aesthetic facial profile was shown more in the adolescent group. 3. As for IMPA, U1 to FH, E line, the figure in the upper and lower lips was changed. Thus, the aesthetic facial profile was improved. However, significance in correlation was indicated only in the upper and lower lips. 4. In both the extraction group and the non-extraction group, the upper lips were indicated to have influence upon the movement in the lower lips.