Aim: There is a growing need for reliable dental age assesment methods in various clinical and scientific disciplines of dental medicine. The purpose of this research was to check the accuracy of Chaillet's international curves of maturity for dental age assesment for children treated in the Department of maxillofacial surgery of Clinical Hospital Centre Split aged 6 to 15. Materials and Methods: A sample of 400 panoramic radiographs (OPT) was used from the archive records of the Department for maxillofacial surgery of the Clinical Hospital Centre Split. Both male patients and female patients were equally represented (200 male and 200 female patients). Patients were aged between 6 to 15 years. Firstly, the assesment of developmental stages of seven teeth at the left side of the lower jaw was performed using Demirjian's method. Subsequently a t – test for related samples was used for comparison between the dental age and chronological age. A software package SPSS version 13 was used for statistical calculations. Results: Average dental age for the total sample is overestimating the dental age in relation to chronological age for boys, 0,49 years (5 months and 9 days), while the difference for the girls is only 0,08 (29 days). Conclusion: On average, Chaillet's method overestimates the dental age for less than 6 months based on OPTs examinated in this research. However, Chaillet's method has been shown to be more accurate for dental age assesment in girls irrespectively of their age. Range of deviations between the dental age and chronological age presented in this research should be considered when applying Chaillet's method for dental age assesment. Key words: dental age, chronological age, Chaillet's international curves of maturity