Preparation of dentin standard samples for age estimation based on increased aspartic acid racemization rate by heating
•Age estimation by aspartic acid racemization requires a wide age range of teeth.•Standard samples could be prepared by the racemization rate increased via heating.•The error ranges between actual and estimated ages were within ±5 years.•The stability of racemization rates in prepared powdered sampl...
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Published in | Legal medicine (Tokyo, Japan) Vol. 38; pp. 25 - 31 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
01.05.2019
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Abstract | •Age estimation by aspartic acid racemization requires a wide age range of teeth.•Standard samples could be prepared by the racemization rate increased via heating.•The error ranges between actual and estimated ages were within ±5 years.•The stability of racemization rates in prepared powdered samples was high.•This technique would be useful when it is difficult to collect age-known teeth.
Age estimation in adults based on aspartic acid racemization (AAR) provides fewer errors and higher precision than that based on bone morphology for the identification of cadavers. The technique has been established in some labs as a routine method. However, as the essential requisites for the technique, a wide age range of teeth of the same type as the target tooth must be collected for calibration for each examination. We investigated whether dentin standard samples could be prepared by increasing the AAR rate via heat. Powdered dentin was prepared from a maxillary first premolar (13 years) and heated for 0–72 h at 110 °C. The extent of AAR increased significantly with heating time and the correlation was strong (r = 0.913; p < 0.01). Similar results were found for a mandibular canine (24 years, r = 0.948; p < 0.01) and a maxillary third molar (20 years, r = 0.944; p < 0.01). We attempted to estimate the age of four maxillary first premolars of persons aged 25–58 years by using the heated samples (18 years, 12 h to 7 days). The differences between the actual and estimated ages were within ±5 years. The stability of the AAR rates in the powdered dentin during storage at 22–25 °C, 4 °C, and −30 °C was examined after 1 year and no significant changes had occurred. We were able to prepare dentin standard samples and created a calibration curve. This is a pilot study that needs to be validated before it can be used in forensic practice. |
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AbstractList | •Age estimation by aspartic acid racemization requires a wide age range of teeth.•Standard samples could be prepared by the racemization rate increased via heating.•The error ranges between actual and estimated ages were within ±5 years.•The stability of racemization rates in prepared powdered samples was high.•This technique would be useful when it is difficult to collect age-known teeth.
Age estimation in adults based on aspartic acid racemization (AAR) provides fewer errors and higher precision than that based on bone morphology for the identification of cadavers. The technique has been established in some labs as a routine method. However, as the essential requisites for the technique, a wide age range of teeth of the same type as the target tooth must be collected for calibration for each examination. We investigated whether dentin standard samples could be prepared by increasing the AAR rate via heat. Powdered dentin was prepared from a maxillary first premolar (13 years) and heated for 0–72 h at 110 °C. The extent of AAR increased significantly with heating time and the correlation was strong (r = 0.913; p < 0.01). Similar results were found for a mandibular canine (24 years, r = 0.948; p < 0.01) and a maxillary third molar (20 years, r = 0.944; p < 0.01). We attempted to estimate the age of four maxillary first premolars of persons aged 25–58 years by using the heated samples (18 years, 12 h to 7 days). The differences between the actual and estimated ages were within ±5 years. The stability of the AAR rates in the powdered dentin during storage at 22–25 °C, 4 °C, and −30 °C was examined after 1 year and no significant changes had occurred. We were able to prepare dentin standard samples and created a calibration curve. This is a pilot study that needs to be validated before it can be used in forensic practice. Age estimation in adults based on aspartic acid racemization (AAR) provides fewer errors and higher precision than that based on bone morphology for the identification of cadavers. The technique has been established in some labs as a routine method. However, as the essential requisites for the technique, a wide age range of teeth of the same type as the target tooth must be collected for calibration for each examination. We investigated whether dentin standard samples could be prepared by increasing the AAR rate via heat. Powdered dentin was prepared from a maxillary first premolar (13 years) and heated for 0-72 h at 110 °C. The extent of AAR increased significantly with heating time and the correlation was strong (r = 0.913; p < 0.01). Similar results were found for a mandibular canine (24 years, r = 0.948; p < 0.01) and a maxillary third molar (20 years, r = 0.944; p < 0.01). We attempted to estimate the age of four maxillary first premolars of persons aged 25-58 years by using the heated samples (18 years, 12 h to 7 days). The differences between the actual and estimated ages were within ±5 years. The stability of the AAR rates in the powdered dentin during storage at 22-25 °C, 4 °C, and -30 °C was examined after 1 year and no significant changes had occurred. We were able to prepare dentin standard samples and created a calibration curve. This is a pilot study that needs to be validated before it can be used in forensic practice. |
Author | Ishii, Namiko Yamaguchi, Satoshi Noritake, Kanako Ohtani, Susumu Funakoshi, Takeshi Utsuno, Hajime Marukawa, Eriko Minegishi, Saki Harada, Hiroyuki Sakuma, Ayaka Sakurada, Koichi Saitoh, Hisako Uemura, Koichi |
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Keywords | Age estimation Heating Dentin standard samples Aspartic acid racemization |
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Snippet | •Age estimation by aspartic acid racemization requires a wide age range of teeth.•Standard samples could be prepared by the racemization rate increased via... Age estimation in adults based on aspartic acid racemization (AAR) provides fewer errors and higher precision than that based on bone morphology for the... |
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SubjectTerms | Age estimation Aspartic acid racemization Dentin standard samples Heating |
Title | Preparation of dentin standard samples for age estimation based on increased aspartic acid racemization rate by heating |
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