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Accessing developmental information of fossil hominin teeth using new synchrotron microtomography-based visualization techniques of dental surfaces and interfaces

Le Cabec, Adeline ; Tang, Nancy ; Tafforeau, Paul Viriot, Laurent

PloS one, 2015-04, Vol.10 (4), p.e0123019-e0123019 [Periódico revisado por pares]

United States: Public Library of Science

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Título:
Accessing developmental information of fossil hominin teeth using new synchrotron microtomography-based visualization techniques of dental surfaces and interfaces
Autor: Le Cabec, Adeline ; Tang, Nancy ; Tafforeau, Paul
Viriot, Laurent
Assuntos: Age ; Algorithms ; Animals ; Canine teeth ; Chronology ; Defects ; Dental enamel ; Dental Enamel - diagnostic imaging ; Dental Enamel - growth & development ; Dentition ; Enamel ; Evolution ; Evolutionary biology ; Female ; Fossils ; Histology ; Hominidae - growth & development ; Hominids ; Imaging, Three-Dimensional ; Interfaces ; Life history ; Life Sciences ; Matching ; Methods ; Microscopy ; Microtomography ; Particle accelerators ; Phase contrast ; Stress, Mechanical ; Subdivisions ; Surface Properties ; Synchrotrons ; Taphonomy ; Teeth ; Three dimensional models ; Tooth - diagnostic imaging ; Tooth - growth & development ; Tooth Crown - diagnostic imaging ; Tooth Crown - growth & development ; X ray microtomography ; X-Ray Microtomography - instrumentation
É parte de: PloS one, 2015-04, Vol.10 (4), p.e0123019-e0123019
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Conceived and designed the experiments: ALC PT. Performed the experiments: ALC PT NT. Analyzed the data: ALC PT NT. Contributed reagents/materials/analysis tools: PT ALC. Wrote the paper: ALC PT NT.
Competing Interests: The authors have declared that no competing interests exist.
Descrição: Quantification of dental long-period growth lines (Retzius lines in enamel and Andresen lines in dentine) and matching of stress patterns (internal accentuated lines and hypoplasias) are used in determining crown formation time and age at death in juvenile fossil hominins. They yield the chronology employed for inferences of life history. Synchrotron virtual histology has been demonstrated as a non-destructive alternative to conventional invasive approaches. Nevertheless, fossil teeth are sometimes poorly preserved or physically inaccessible, preventing observation of the external expression of incremental lines (perikymata and periradicular bands). Here we present a new approach combining synchrotron virtual histology and high quality three-dimensional rendering of dental surfaces and internal interfaces. We illustrate this approach with seventeen permanent fossil hominin teeth. The outer enamel surface and enamel-dentine junction (EDJ) were segmented by capturing the phase contrast fringes at the structural interfaces. Three-dimensional models were rendered with Phong's algorithm, and a combination of directional colored lights to enhance surface topography and the pattern of subtle variations in tissue density. The process reveals perikymata and linear enamel hypoplasias on the entire crown surface, including unerupted teeth. Using this method, highly detailed stress patterns at the EDJ allow precise matching of teeth within an individual's dentition when virtual histology is not sufficient. We highlight that taphonomical altered enamel can in particular cases yield artificial subdivisions of perikymata when imaged using X-ray microtomography with insufficient resolution. This may complicate assessments of developmental time, although this can be circumvented by a careful analysis of external and internal structures in parallel. We further present new crown formation times for two unerupted canines from South African Australopiths, which were found to form over a rather surprisingly long time (> 4.5 years). This approach provides tools for maximizing the recovery of developmental information in teeth, especially in the most difficult cases.
Editor: United States: Public Library of Science
Idioma: Inglês

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Accessing developmental information of fossil hominin teeth using new synchrotron microtomography-based visualization techniques of dental surfaces and interfaces

Le Cabec, Adeline ; Tang, Nancy ; Tafforeau, Paul Viriot, Laurent

United States: Public Library of Science

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