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Variation in the timing of enamel formation in modern human deciduous canines

Dean, MC; Humphrey, L; Groom, A; Hassett, B; (2020) Variation in the timing of enamel formation in modern human deciduous canines. Archives of Oral Biology , 114 , Article 104719. 10.1016/j.archoralbio.2020.104719. Green open access

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Abstract

OBJECTIVES: Deciduous canines are now used increasingly in archaeological and forensic studies to establish the time of birth and as a retrospective source of trace elements incorporated into enamel before and after birth. However, data on the variability of deciduous enamel formation times are scarce. Our objectives were to use daily incremental markings to estimate daily secretion rates, the timing of prenatal, postnatal and total enamel formation and any changes in enamel coverage or prism and stria orientation that occur during enamel formation. MATERIALS AND METHODS: Longitudinal ground sections of 81 deciduous canines were studied with transmitted light microscopy. High-resolution digital images were imported from an Olympus VS-120 virtual slide scanning system into a geographic information system (ArcGIS, ESRI USA) for quantitative and statistical analyses of linear, angular and area measurements of buccal enamel. RESULTS: Daily rates of enamel secretion close to the EDJ were faster than in permanent enamel (3.23 μm/day, SD = 0.54). Prism and stria angles subtended to the EDJ both increased through crown formation. Enamel coverage was low in the cusp and cervix but maximal ∼150 days after birth. The mean prenatal enamel formation time was 118 days (range 60-150, SD, 29.2, n = 24). The overall mean postnatal enamel formation time was 319 days (range 210-420, SD 50.6, n = 67). CONCLUSIONS: Daily enamel secretion rates compared well with previous studies of deciduous enamel, however, enamel extension rates in deciduous cuspal enamel were notably lower. The variability of both prenatal and postnatal deciduous enamel formation times was greater than previously reported.

Type: Article
Title: Variation in the timing of enamel formation in modern human deciduous canines
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.archoralbio.2020.104719
Publisher version: https://doi.org/10.1016/j.archoralbio.2020.104719
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: ALSPAC, Deciduous canine, Deciduous crown formation, Enamel extension rate, Enamel secretion rate, Prenatal enamel
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Institute of Archaeology
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Institute of Archaeology > Institute of Archaeology Gordon Square
URI: https://discovery.ucl.ac.uk/id/eprint/10098245
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