Rai B reported that positive correlation between coronal displacement of cementum in impacted teeth and age and proposed BR regression equation for Indian population . Materials and methods -This study was conducted on 100 impacted mandibular third molars extracted from napalase healthy patients , aged between 18 and 22 years. The buccolingual ground sections were prepared and the distance between the edges of enamel and cementum were measured with micrometer attached to a light microscope. Results and conclusion-The following regression equation was derived: Age= (Cementum-enamel distance) +543/29.7. A significant correlation (r = 0.89) between age and coronal displacement of cementum in impacted teeth was calculated and a regression equation was derived for age estimation.

Key words: Forensic science; Cementum; Enamel; Cemento–enamel junction; Fully impacted teeth; Mandibular third molar; Age estimation.