Forensic Odontologist Dr. Sisira Ranasinghe , Professor of Forensic Medicine and Toxicology Professor Jean Perera , Professor of Oral Biology Professor Jane A. Taylor , Forensic Pathologist Dr. Ajith Tennakoon , Consultant Radiologist Dr. Aruna Pallewatte , Professor of Oral Medicine Professor Ruwan Jayasinghe
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Abstract
Objectives
Main objective was to determine the probability at 16-year age threshold by using unilateral second and third developing mandibular molars in a group of Sri Lankan children. The above threshold is one of the specific ages for children in Sri Lanka legislature.
Methods & Materials
This retrospective cross sectional study used 783 Orthopantomographs (385 males and 398 females) of Sri Lankan children and young adults ranging in age from 8.00 to 24.99 years both males and females and analysed based on Demirjian maturity stages A to H. The Mean (SD) age of assessments to the different Demirjian stages for two molars were calculated using SPSS. The probability assessment for a child being reached the 16-year threshold was calculated using NORMDIST function in Excel. The validity was tested on a validation sample of 50 males and 50 females. Third molar comparison of mean ages of assessments to Demirjian stages was done with other population studies.
Results
The Mean and (SD) in the reference sample was 15.02(3.77) years for males 15.51(4.98) years for females. The probability estimates correctly identified individuals above or below the reference age was 93% and only 7% was identified incorrectly.
Conclusion
This study has confirmed that the second and third molars in the mandible can reliably be used to determine the probability at 16-year threshold. The Mean (SD) ages of assessment to corresponding Demirjian stages from D to H of third mandibular molar in the present study are fairly compatible with that of ABFO study of Mincer et al. which is widely used as a reference data for Forensic age estimation procedure in Sri Lanka.
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