Dental age assessment in children : a comparison of four methods in a recent french population
Résumé
The aim of this study was to analyze the accuracy and the reliability of four methods of dental age estimation (Demirjian, Willems I, Willems II, and Chaillet standards) in a French population. Orthopantomograms of 743 children aged between 4 and 15 years were used. The Demirjian standards gave a consistent overestimation of dental age compared with chronological age (+0.45 and +0.46years for girls and boys, respectively). We found that three modified methods were more accurate for both sexes than Demirjian's method: the Willems I method appeared to be more suitable when the sex and ethnicity are both known (-0.09 and +0.14years for girls and boys, respectively); the Willems II method was more accurate for children of unknown sex (mean difference=0.00years), and the Chaillet method was found to be more accurate than the Demirjian method, but less accurate than the Willems I method (-0.59 and -0.18years for girls and boys, respectively).