(The) statistical study of prevalence of congenital dental anomalies throuth dental roentgenographic findings

치의학과/석사[한글] 저자는 연세대학교 치과대학 부속병원 소아치과에 내원한 만4∼14세의 어린이, 남자 555명, 여자 469명 도합 1024명에서 치아의 수의 이상에 관한 발생빈도를 구강검사, 방사선학적 관찰, 통계학적으로 조사한 결과 다음과 같은 결론을 얻었다. 1. 1024명의 피검자중 66명(남자 37, 여자:29)이 제 3 대구치를 제외한 총 122개의 영구치아가 결손되어 치아의 선천적 결손빈도는 6.45±0.8%이었으며, 선천적 결손치아가 있는 어린이의 대부분(86.4%)이 1人당 1∼2개의 치아의 결손을 보였다 2. 선천적 결손치의 치아별 발생빈도를 순서대로 보면, 하악 제 2 소구치가 총 결손치아의수의 30.33%로 가장 빈도가 높고, 다음 상악 제 2 소구치 25.41%, 상악 측절치 13.93%, 하악 중절치 12.30%. 하악 측절치 9.83% 순서로 결손 되었다. 3. 남녀별, 편측대 양측, 상악대 하악, 좌측대 우측에 관한 치아의 선천적 결손빈도의 비교는 통계학적으로 유의의 차가 없었다. 4. 과잉치의 발생빈도는 1024명의 피검자중 49명 (남자:39, 여자:10)이 59개의 과잉치를 보여 4.79±0.67% 이었으며, 과잉치를 가지고 있는 모든 어린이가 하나 또는 두개의 과잉치를 가지고 있었다. 5. 남녀별 과잉치의 발생빈도의 비교에서는 통계학적인 유의의 차를 보여 남자에서 더 호발하는 것으로 나타냈으며, 과잉치의 위치에 대해서는 상악 양 중절치 사이에 과잉치가 있는 사람, 즉 mesiodens가 있는 사람이 43명으로 과잉치가 있는 사람의 87.8%에 해당되었다. THE STATISTICAL STUDY OF PREVALENCE OF CONGENITAL DENTAL ANOMALIES THROUTH DENTAL ROENTGENOGRAPHIC FINDINGS. Seon Ok Choi, D.D.S. Department of Dental Science, Graduate School, Yonsei Univesity (Directed by Associate Prof. Jong Gap Lee, D.D.S., M.S.D., Ph. D.) This study was undertaken in order to observe the prevalence of congenital dental anomalies especially that of oligodontia and supernumerary teeth in 1024 children at age from 4 to 14 years, through history taking, oral examinations, roentgenographic observations of subjects, and statistic analysis was made. The following results were obtained: 1. The prevalence of oligodontia in 1024 children was 6.45±.8 percent with a total of 122 teeth absent in sixty-six subjects, excluding 3rd molars, and most of children (86.4%) who have congenitally missing teeth showed abscence of one or two teeth individually. 2. The teeth most frequently absent were the mandibular second premolar, maxillary second premolar, maxillary lateral incisor, mandibular central incisor, and mandibular lateral incisor in order. 3. There was no statistically significant difference found in tooth abscence in the following comparisons; . Male vs Female . Bilateral. vs Unilateral . Maxilla. vs Mandible . Right vs Left 4. The prevalence of supernumerary teeth in 1024 children was 4.79±.67 percent with a total of 59 supernumerary teeth in forty-nine subjects, all of children who have supernumerary teet showed one or two supernumerary teeth individually. 5. Statistically significant difference was found in supernumerary teeth in the comparison of male vs female, and they were more frequent in male. [영문] This study was undertaken in order to observe the prevalence of congenital dental anomalies especially that of oligodontia and supernumerary teeth in 1024 children at age from 4 to 14 years, through history taking, oral examinations, roentgenographic observations of subjects, and statistic analysis was made. The following results were obtained: 1. The prevalence of oligodontia in 1024 children was 6.45±.8 percent with a total of 122 teeth absent in sixty-six subjects, excluding 3rd molars, and most of children (86.4%) who have congenitally missing teeth showed abscence of one or two teeth individually. 2. The teeth most frequently absent were the mandibular second premolar, maxillary second premolar, maxillary lateral incisor, mandibular central incisor, and mandibular lateral incisor in order. 3. There was no statistically significant difference found in tooth abscence in the following comparisons; . Male vs Female . Bilateral. vs Unilateral . Maxilla. vs Mandible . Right vs Left 4. The prevalence of supernumerary teeth in 1024 children was 4.79±.67 percent with a total of 59 supernumerary teeth in forty-nine subjects, all of children who Nhave supernumerary teet showed one or two supernumerary teeth individually. 5. Statistically significant difference was found in supernumerary teeth in the comparison of male vs female, and they were more frequent in male.restrictio