Third-Molar Development in Relation to Chronologic Age in Young Adults of Central China
10.1007/s11596-008-0426-9
- Author:
BAI YUMING
1
;
MAO JING
;
ZHU SHENGRONG
;
WEI WEI
Author Information
1. Department of Orthodontics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China;Department of Forensic, Police College of Hubei, Wuhan 430034, China
- Keywords:
third molar;
chronological age;
age estimation
- From:
Journal of Huazhong University of Science and Technology (Medical Sciences)
2008;28(4):487-490
- CountryChina
- Language:Chinese
-
Abstract:
The estimation of chronologic age based on the stages of third-molar development was evaluated by using the eight stages (A-H) method of Demirjian and the third-molar development was compared, in terms of sex and age, with results of previous studies. The samples consisted of 291orthopantomograms from young Chinese subjects of known chronologic age and sex (including 139males with a mean age of 14.67±3.62 y and 152 females with a mean age of 14.85±3.70 y). Statistical analysis was performed by employing the Mann-Whitney U-test and the t-test. Regression analysis was conducted to obtain regression formulas for calculating dental age from the chronologic age. Our results showed statistically significant differences (P＜0.05) in third-molar development between males and females, at the calcification stages D, E and H. And a strong correlation was found between age and third-molar development in both males (r2=0.65) and females (r2=0.61). New equations (Age=8.76+1.32 Development stage) for estimating chronologic age were derived. It is concluded that third-molar genesis took place earlier in males than in females. The use of third molars as a developmental marker is appropriate in young adults of Central China. The formula obtained in the present study can be used as a guide for estimation of dental maturity and a standard for age estimation for young adults of Central China.
