Journal of the Korean Academy of Pediatric Dentistry 2006;33(2):253-261.
Published online May 31, 2006.
The prediction of the tooth size in the mixed dentition for Korean
Sung-Hwan Moon1, Seong-Oh Kim1, Hyung-Seog Yu2, Byung-Jai Choi1, Hyung-Jun Choi1, Jae-Ho Lee1
1
2 
한국인에서의 혼합치열기 공간분석
문성환1, 김성오1, 유형석2, 최병재1, 최형준1, 이제호1
1연세대학교 치과대학 소아치과학교실 및 구강과학연구소
2연세대학교 치과대학 교정학교실 및 구강과학연구소
Correspondence:  Jae-Ho Lee, 
Abstract
Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Several methods were introduced and used for the prediction. The most common methods among these would be Moyers probability chart and Tanaka and Johnston equations. These are currently used widely, but they were developed for Caucasians. Because there are clear racial differences in teeth size, the objectives of this study were to produce correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and those of the canines and premolars for each quadrant, and prediction tables with regression equations, specifically for Korean. 178 young adults (70 women, 108 men, mean age 21.63 years) were selected from the College of Dentistry, Yonsei University, Seoul, Korea. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and those of the maxillary and mandibular canines and premolars were found to be between 0.52 and 0.64. The standard error of the estimatation was better (0.60) for women and the γ2 values ranged from 0.27 to 0.41 for both sexes Prediction tables were prepared for Korean. This study showed larger canine and premolar diameters than Tanaka and Johnston's and Moyers' studies which might be due to the racial differences. Further investigations with a larger sample size will be needed for more representative data on the Korean population.
Key Words: Mixed dentition analysis, Tooth size, Prediction tables
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