Journal of the Korean Academy of Pediatric Dentistry 2007;34(3):430-437.
Published online August 31, 2007.
THE BEST TEETH COMBINATION TO PREDICT MESIODISTAL DIAMETERS OF THE UNERUPTED CANINE AND PREMOLARS OF KOREANS
So-Hwa Kim, Seong-Oh Kim, Hyung-Jun Choi, Byung-Jai Choi, Jae-Ho Lee
Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University 
한국인에서 미맹출 견치와 소구치의 근원심 폭경 예측을 위한 최적의 치아조합
김소화, 김성오, 최형준, 최병재, 이제호
연세대학교 치과대학 소아치과학교실∙구강과학연구소
Correspondence:  Jae-Ho Lee,  Tel: 02-2228-3170, Email: leejh@yumc.ac.kr
Abstract
The probability table of Moyers and prediction equation of Tanaka and Johnston that have been the most frequently used, cannot produce accurate prediction when used in Korean because they are based on the Caucasian popularity of the Northern European race. The method of Moyers or Tanaka and Johnston predicts sizes of the unerupted canine and premolars on the basis of the sizes of mandibular incisors. However, some of the recent papers raise a question as to whether the mandibular incisors are the best combination to predict the sizes of the unerupted canine and premolars. The purpose of this study is to determine which sum or combination of sums of permanent tooth widths present the best prediction for the unerupted canine and premolars in a Korean sample, to calculate a specific linear regression equation for this population, and to evaluate the clinical significance. A new linear regression equation was calculated based on the data of 178 Korean young adults(70 women, 108 men, mean age 21.63 years) with complete permanent dentitions. Fifty three more children( 28 girls, 25 boys, mean age 14.22 years) were used as a validation sample for the application of the multiple linear regression equation. The conclusions were as follows: 1. The combination of the sums of permanent upper central incisors, lower lateral incisors and upper first molars was the best predictor for the unerupted canine and premolars in this sample(r=0.65~ 0.80). 2. The multiple linear regression equation was calculated including sex and arch as additional predictor variables. male, upper: Y = 0.332×X0 + 6.195 male, lower: Y = 0.332×X0 + 5.269 female, upper: Y = 0.332×X0 + 5.929 female, lower: Y = 0.332×X0 + 5.003 The determination coefficient of the equation was 64% and a standard error of the estimate was 0.71mm. 3. In about 97% of the validation sample, the estimation of the tooth width sums of unerupted canine and premolars using the new multiple linear regression equation was smaller than 1mm compaired with the actual values.
Key Words: Mixed dentition, Prediction of space, Mesiodistal tooth size


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