Sriwisut Tangkabutra1, Emad Alzoubi1, Graham Roberts2, Victoria Lucas2, Simon Camilleri3. 1. Department of Child Dental Health and Orthodontics, Faculty of Dental Surgery, Medical School, University of Malta, Msida, Malta. 2. Department of Orthodontics, Faculty of Dentistry, Oral & Craniofacial Sciences, Tower Wing, Great Maze Pond, London, SE1 1UL, UK. 3. Department of Child Dental Health and Orthodontics, Faculty of Dental Surgery, Medical School, University of Malta, Msida, Malta. simon.camilleri@um.edu.mt.
Abstract
INTRODUCTION: The determination of age of majority (the 18-year-old threshold) using the popular Demirjian tooth staging method is unreliable, so other maturity markers are required. This study examines whether the ratio of the root canal widths (RCW) of the mandibular first, second and third molars is a useful indicator of age. METHODS: Nine hundred eighteen dental panoramic radiographs (DPT) were examined and the ratio of the mid-points of the distal roots of the left mandibular first, second and third molars assessed according to the RCW stages as described by Roberts (J Forensic Sci 62:351-354, 2017). RESULTS: Individuals who had reached stages RCW-A and RCW-B were represented in a wide range of ages spanning the 18-year-old threshold. Individuals who had reached Stage RCW-C were all above the 18-year-old threshold. It was not possible to analyse a large number of DPTs for various reasons. DISCUSSION: Individuals categorised as stage RCW-C may be deemed to have reached the 18-year-old threshold. These results are consistent with other published studies. Variation in root morphology and in the rate of development of the third molar limits the applicability of this method. CONCLUSIONS: RCW staging is an accurate method of determining the 18-year-old threshold. Its limited applicability requires the use of substitute markers in a large number of cases.
INTRODUCTION: The determination of age of majority (the 18-year-old threshold) using the popular Demirjian tooth staging method is unreliable, so other maturity markers are required. This study examines whether the ratio of the root canal widths (RCW) of the mandibular first, second and third molars is a useful indicator of age. METHODS: Nine hundred eighteen dental panoramic radiographs (DPT) were examined and the ratio of the mid-points of the distal roots of the left mandibular first, second and third molars assessed according to the RCW stages as described by Roberts (J Forensic Sci 62:351-354, 2017). RESULTS: Individuals who had reached stages RCW-A and RCW-B were represented in a wide range of ages spanning the 18-year-old threshold. Individuals who had reached Stage RCW-C were all above the 18-year-old threshold. It was not possible to analyse a large number of DPTs for various reasons. DISCUSSION: Individuals categorised as stage RCW-C may be deemed to have reached the 18-year-old threshold. These results are consistent with other published studies. Variation in root morphology and in the rate of development of the third molar limits the applicability of this method. CONCLUSIONS: RCW staging is an accurate method of determining the 18-year-old threshold. Its limited applicability requires the use of substitute markers in a large number of cases.
Authors: Andreas Olze; Tore Solheim; Ronald Schulz; Michael Kupfer; Heidi Pfeiffer; Andreas Schmeling Journal: Int J Legal Med Date: 2010-07-11 Impact factor: 2.686