Comparison of racemization rates between vital and endodontically treated teeth for age estimation |
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| Institution: | 1. Department of Forensic Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan;2. Department of Legal Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8670, Japan;1. School of Medicine, Tokyo Women’s Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan;2. Department of Forensic Medicine, School of Medicine, Tokyo Women’s Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan;1. Institute of Forensic Medicine, Medizinische Fakultät Technische Universität Dresden, Germany;2. Department of Visceral-, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany;3. Institute of Pathology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany;1. Department of Forensic Medicine, Harbin Medical University, Harbin 150086, China;2. Department of Infectious Diseases, Beidahuang Group General Hospital, Harbin 150088, China;1. Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai 200032, PR China;2. Department of Preventive Medicine, School of Public Health, Fudan University, Shanghai 200032, PR China;3. Department of Forensic Science, School of Basic Medical Sciences, Central South University, Changsha 410013, Hunan, PR China;4. Key Laboratory of Forensic Toxicology, Ministry of Public Security, People’s Republic of China (Beijing Municipal Public Security Bureau), Beijing 100192, PR China;5. Institute of Forensic Science, Ministry of Public Security, Beijing 100038, PR China;1. Department of Cardiac, Thoracic, Vascular Sciences and Public Health, Unit of Legal Medicine and Toxicology, University of Padova, Via Falloppio 50, 35100 Padova, Italy;2. Department of Diagnostics and Public Health – Unit of Forensic Medicine, University of Verona, P.le L.A. Scuro 10, 37134 Verona, Italy;3. Department of Cardiac, Thoracic, Vascular Sciences and Public Health, Unit of Hygiene and Public Health, University of Padova, Via Loredan 18, 35131 Padova, Italy;4. Regional Centre for Transplant Coordination of Veneto Region, Via Giustiniani 2, 35128 Padova, Italy;1. Department of Legal Medicine, Osaka Medical and Pharmaceutical University, Osaka, Japan;2. Forensic Science Laboratory, Osaka Prefectural Police HQ, Osaka, Japan |
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| Abstract: | Amino acid racemization of dentin (AAR) is among the most precise methods for age estimation in unidentified adult cadavers. Although vital teeth are generally used for this technique, cases often have endodontically treated (Endo) teeth only. Therefore, the aim of this preliminary pilot study was to determine the applicability of Endo teeth by comparing AAR rates between vital and Endo teeth. Thirty-six dentin samples from vital teeth and 18 dentin samples from Endo teeth were analyzed, including the maxillary first premolar, maxillary second molar, and mandibular second premolar. Standard calibration curves for the mandibular second premolar and maxillary second molar were compared among vital teeth, Endo teeth, and mixed vital/Endo teeth. Discrepancies between estimated and actual ages were assessed by analyzing the AAR rates for the maxillary first premolar between vital and Endo teeth. The AAR rates for Endo teeth were higher than those for vital teeth in both the mandibular second premolar and maxillary second molar, and the correlation of the standard calibration curve for vital teeth only was highest (r = 0.982836; r = 0.92011467), followed by mixed (r = 0.949579; r = 0.76158) and Endo teeth only (r = 0.896082; r = 0.744991). In the maxillary first premolar, discrepancies were more than 10 years for all 5 Endo teeth, based on the standard calibration curve of vital teeth. The present study suggests that the AAR rates for Endo teeth might be affected by variation in dentin structure between vital and Endo teeth. |
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| Keywords: | Age estimation Endodontically treated teeth Racemization Vital teeth |
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