Accuracy of the Nolla Method for Dental Age Estimation in the Northwest Anatolian Turkish Child Population

Çarıkçıoğlu B., Öztürk H., Sezer B.

29th International Congress of Turkish Society of Paediatric Dentistry, Ankara, Turkey, 12 - 15 October 2023, pp.71

  • Publication Type: Conference Paper / Summary Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.71
  • Çanakkale Onsekiz Mart University Affiliated: Yes


Aim: The chronological age estimation method,which is performed by determining the dental age,is one of the easy and reliable methods to use. The aim of this study was to evaluate the accuracy between dental age determined by the Nolla method and chronological age in a group of children living in the Northwest Anatolian region. Methods: A total of 1014 panoramic radiographs of 528 boys and 486 girls aged 6 to 14 years were retrospectively analyzed in this study. “Chronological age” was calculated by subtracting the date of birth from the date the panoramic radiograph was taken,and “dental age” was calculated using the Nolla method. Mean dental age and chronological age were analyzed by Paired Sample T-test and Wilcoxon Signed-Rank test according to sex and age groups.The closeness of the dental age to the chronological age was found by calculating the mean absolute error and the accuracy of the Nolla method was determined. Results: It was found that Nolla method overestimated the chronological age in the whole group (0.04) and boys (0.31),and underestimated the chronological age in girls (-0.25). With Nolla method,age was underestimated in boys only in the 13-year-old group (-0.06), while in girls, age was underestimated in all age groups. Mean absolute error in both girls and boys was the lowest in the age group of 7 years and was found to be statistically significant (p<0.05). Conclusions: Although the Nolla method may not be entirely accurate for children living in the Northwest Anatolian region,it can provide results that are close to chronological age. Keywords: age estimation, dental age, nolla method, panoramic radiographs