第III級 不正咬合者의 顎角前切痕 深度와 頭顔面骨格形態에 관한 頭部放射線 計測學的 硏究

A ROENTGENOCEPHALOMETRIC STUDY ON THE DEPTH OF THE ANTEGONIAl NOTCH AND THE CRANIOFACIAL MORPHOLOGY IN CLASS III MALOCCLUSION

This study was undertaken to investigate the relationship between the depth of antegonial notch and the craniofacial morphology, and to predict the mandibular growth direction & potential class III malocclusion. The computerized analyses were carried out on longitudinal lateral cephalometric radiographs of 50 children with class III malocclusion, divided into two groups; 30 deep notch subjects (more than 2.6mm) and 20 shallow notch subjects (less than 1.5mm). The conclusions were as follows: 1. The mandibular growth direction in deep notch group was more vertically directed than in shallow notch group. 2. Deep notch group had shorter anterior & posterior cranial base than shallow notch group. 3. There was not significant difference between deep & shallow notch groups in the amount of mandibular growth during treatment period. 4. Notch depth increased in both deep & shallow notch groups during treatment period.