Backgrounds-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.

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