A STUDY ON THE SIZE OF THE PERMANENT TEETH

Baik, Byeong-Ju; Park, Jeong-Yeol; Kim, Jae-Gon; Lee, Doo-Cheol

Journal of the Korean Academy of Pediatric Dentistry 2003;30(3):502-509.
Published online August 31, 2003.

A STUDY ON THE SIZE OF THE PERMANENT TEETH

Byeong-Ju Baik, Jeong-Yeol Park, Jae-Gon Kim, Doo-Cheol Lee

영구치의 치아크기에 관한 연구

백병주, 박정렬, 김재곤, 이두철

전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소

Abstract

After 800 students of Chonbuk National University was examined, 86 people (male : 43, female : 43, mean age : 22.2 years old) was selected as a group of normal occlusion. From their gypsum cast, this conclusion was obtained. 1. Intra-observer measurement errors in buccolingual diameter, maxillary lateral incisors have somewhat bigger errors. In mesiodistal diameter, maxillary first molars and maxillary second molar have bigger numerical value. Mean errors of measurement are 0.051mm at buccolingual diameter of crown and 0.083mm at mesiodistal diameter. 2. Fluctuating asymmetry is 0.030 average in buccolingual diameter, and 0.037 average in mesiodistal diameter. Statistically there are no big differences. 3. Male has longer buccolingual diameter than female in every permanent teeth. Teeth which have statistical difference in buccolingual diameter are maxillary lateral incisor, maxillary canine, maxillary second molar, mandibular central incisor, mandibular canine, mandibular second premolar, and mandibular first molar. In mesiodistal diameter maxillary central incisor, maxillary canine, and mandibular first molar have statistically difference. 4. Tooth which has the biggest difference depending on gender is maxillary lateral incisor in buccolingual diameter and mandibular canine in mesiodistal diameter. 5. Both sexes have similar crown index. Male has bigger value of crown module measurement and crown area measurement in every tooth. Crown area considered as size of tooth from occlusal surface was bigger in male than in female statistically except some teeth, maxillary first premolar, mandibular lateral incisor, first premolar and second premolar.

Key Words: Tooth size, Permanent tooth, Buccolingual diameter of crown, Mesiodistal diameter of crown