Age estimation using orthopantomogram of mandibular and maxillary second and third molars by modifiication of nolla’s method

Dental age estimation is a crucial tool in forensic medicine used to determine an individual’s approximate age based on dental development. It is particularly useful in legal cases, including rape, criminal abortion, and determining the eligibility of minors for specific activities. Orthopantomogram (OPG) is a non-invasive, cost-effective technique used to assess dental age. While Nolla’s method has been widely used for individuals aged 17 years and below, our study extends its application to individuals above 17 years, focusing specifically on the 2nd and 3rd molars.

In this study, we assessed dental age using OPG among individuals above 17 years. Unlike Nolla, who analysed all eight teeth on either side of the jaw, we concentrated on the 2nd and 3rd molars of both jaws, preferably on the left side.

Our findings revealed that chronological age closely matched the estimated age in the 17-23-year age group, showing minimal standard deviation (SD). However, greater SD was observed in individuals aged 12-17 years and 24-30 years. This indicates that our method is most accurate within the 17-23-year range.

The study validates the effectiveness of OPG-based dental age estimation, particularly for individuals aged 17-23 years. The preference for the 2nd and 3rd molars provided reliable age estimation even when the number of analysable teeth was limited.