Evaluation of the antegonial notch related to the mandibular morphology and the curve of Spee in anteroposterior relation

Son,  J-H; Kim,  Y-H; Kook,  Y-A

J Korean Dent Assoc > Volume 45(8); 2007 > Article

The Journal of The Korean Dental Association 2007;45(8):483-490.
Published online August 31, 2007.

전후방적 분류에 따른 하악 형태 및 Spee 만곡에 대한 antegonial notch의 관계 평가

손주현¹, 김영호², 국윤아³

^¹가톨릭대학교 임상 치과학 대학원
^²삼성서울병원 치과진료부 교정과
^³가톨릭대학교 강남성모병원 교정과

Evaluation of the antegonial notch related to the mandibular morphology and the curve of Spee in anteroposterior relation

J-H Son¹, Y-H Kim², Y-A Kook³

¹Graduate School of Clinical Dentistry, The Catholic University
²Department of Orthodontics, The Institute of Oral Health & Science, Samsung Medical Center, Sungkyunkwan University School of Medicine
³Department of Orthodonitcs, Kangnam St. Mary’s Hospital, The Catholic University

Abstract

The aim of this study was to investigate the relationship between the mandibular antegonial notch and the mandibular morphology, and the curve of Spee in anteroposterior skeletal relationship. Pre-treatment lateral cephalograms were obtained from 80(male 34, female 46) adult orthodontic patients and the samples were classified into 3 categories by ANB angle(0°≤ANB< 4° Class I, 4°≤ANB Class II, ANB< 0° Class III). The curve of Spee was measured directly from the pre-treatment mandibular study cast of each patient included in this study. Pearson correlation coefficient test and multiple regression analysis in each group revealed the following results; 1. Antegonial notch depth was positively correlated with hoth lower anterior facial height(ANS-Me) in skeletal Class I, II and III groups and Id-Me height in skeletal Class I and II groups. 2. A statistically significant negative correlation was found between the depth of the antegonial notch and the curve of Spee in the Class III group. 3. Significant relationship was not found between the antegonial notch depth and any of the other cephalometric variables such as mandibular body length(Go-Gn) and ramus height(Co-Go). As antegonial notch depth increased, more vertical growth of the mandible was observed. Antegonial notch can be used as a predictor of vertical mandibular growth in the diagnosis and treatment planning of malocclusion.

Key Words: antegonial notch;curve of Spee;mandibular growth;