Histological reconstruction of dental development in four individuals from a medieval site in Picardie, France

Reid, Donald J.; Beynon, A.D.; Rozzi, Fernando Ramírez

doi:10.1006/jhev.1998.0233

Cited by 132 publications

(135 citation statements)

References 31 publications

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“…We note that mandibular M3 initiation can be highly variable; radiographic evidence reveals minimum ages as early as 6 to 7 y, with ranges as large as 5 y within recent human populations (28)(29)(30). Only two histological estimates of recent human mandibular M3 initiation are available: 6.4 y of age for an African individual (31) and 7.7 y of age for a medieval European individual (32). The Le Moustier 1 age at death in this study employs the maxillary M3 initiation age from the Scladina Neanderthal to estimate death at 11.6 to 12.1 y of age (SI Appendix, Table S8).…”

Section: Resultsmentioning

confidence: 91%

“…For Gibraltar 2, Krapina Maxilla B, and Scladina, developmental stress indicators (hypoplasias or accentuated lines) were matched between developmentally overlapping teeth, allowing temporal cross-matching across the dentition, and resulting in a continuous chronology. Initiation ages from Scladina (13) were used for Neanderthals dentitions that could not be crossmatched; a recent human initiation age was used for Irhoud 3 (32). For Qafzeh 10, the distolingual cusp of the maxillary M1 was estimated to have begun formation at birth, and a pair of hypoplasias was used to register the M1 to the maxillary central incisor (I1), which completed crown formation shortly before death.…”

Section: Methodsmentioning

confidence: 99%

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Dental evidence for ontogenetic differences between modern humans and Neanderthals

Smith

Tafforeau

Reid

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

272

251

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Humans have an unusual life history, with an early weaning age, long childhood, late first reproduction, short interbirth intervals, and long lifespan. In contrast, great apes wean later, reproduce earlier, and have longer intervals between births. Despite 80 y of speculation, the origins of these developmental patterns in Homo sapiens remain unknown. Because they record daily growth during formation, teeth provide important insights, revealing that australopithecines and early Homo had more rapid ontogenies than recent humans. Dental development in later Homo species has been intensely debated, most notably the issue of whether Neanderthals and H. sapiens differ. Here we apply synchrotron virtual histology to a geographically and temporally diverse sample of Middle Paleolithic juveniles, including Neanderthals, to assess tooth formation and calculate age at death from dental microstructure. We find that most Neanderthal tooth crowns grew more rapidly than modern human teeth, resulting in significantly faster dental maturation. In contrast, Middle Paleolithic H. sapiens juveniles show greater similarity to recent humans. These findings are consistent with recent cranial and molecular evidence for subtle developmental differences between Neanderthals and H. sapiens . When compared with earlier hominin taxa, both Neanderthals and H. sapiens have extended the duration of dental development. This period of dental immaturity is particularly prolonged in modern humans.

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Section: Resultsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Dental evidence for ontogenetic differences between modern humans and Neanderthals

Smith

Tafforeau

Reid

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

272

251

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“…Others made a thin section through the mesial cusps, and lapped this from either side to reveal the EDJ apices (e.g. Beynon et al, 1998;Reid et al, 1998). This method would be accurate so long as the EDJ cups tips occurred within the initial thin section.…”

Section: Measurements and Methodological Considerations Problem Of Sementioning

confidence: 99%

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

Suwa

Kono

2005

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Enamel thickness was investigated in the mesial cusp section of 167 unworn human molars by means of non-destructive micro-CT based methodology. Serial sections of the entire crown were taken at a voxel resolution of 28 microns, and the initial volume data set of each molar was standardized in orientation to obtain a vertical section that accurately contains the dentine tips of the two mesial cusps. Enamel thickness at the cusp tips, occlusal basin, and lateral crown face was measured in the mesial cusp section and in sections offset from that section by 0.6 mm. We found that thickness at the cusp tips may be overestimated in offset sections by up to about 1 mm, and those of the occlusal basin overestimated or underestimated by up to about 0.5 mm. We also found that maximum 'radial' thickness of the lateral crown face was least affected by section position, usually with discrepancies of less than about 0.1-0.2 mm. In all serial positions in both upper and lower molars, a 'functional' (lingual in uppers and buccal in lowers) to 'non-functional' side gradient in enamel thickness was observed in cusp tip, occlusal basin, and lateral crown face enamel, with the exception of the characteristically thin enamel at the protoconid and paracone cusp tips. Serial differences in thickness were seen between the thinner M1 and the two posterior molars in many but not all measures of thickness, the pattern of which appears to be influenced by the thin M1 mesiobuccal cusp enamel. Individual variation of maximum lateral thickness, the least variable measure of thickness, was found to be substantial (a 30-60% range) even with serial and buccolingual positions controlled. Correlation between whole crown average enamel thickness and maximum lateral thickness was high, indicating that the latter is a potentially useful predictor of overall enamel thickness of the molar crown. The present results indicate that interspecific comparisons of enamel thickness must be made with careful attention to positional placement of thickness measures, potential serial differences, and intraspecific variation.

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Section: Isotope Analysis Of Tooth Enamel Apatitementioning

confidence: 99%

“…The ages at the start and end of enamel formation differ among tooth types (Hillson, 1996;Reid et al, 1998a;Reid and Dean, 2006;Reid et al, 2008). Human permanent tooth crowns, except for third molars, cover the period from shortly before birth in a full term infant to approximately 6 years (Reid et al, 1998a). The durations from the start to end of enamel formation in deciduous teeth cover an earlier period of life (e.g., Hillson, 1996;AlQuatani et al, 2010) although enamel microstructures are more difficult to discern clearly in deciduous teeth than permanent teeth (FitzGerald and Saunders, 2005).…”

Section: Isotope Analysis Of Tooth Enamel Apatitementioning

confidence: 99%

Reconstruction of breastfeeding and weaning practices using stable isotope and trace element analyses: A review

Tsutaya

Yoneda

2014

American J Phys Anthropol

193

188

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Biogeochemical methods using stable isotopes and trace elements have been increasingly developed and applied to reconstruct modern and ancient breastfeeding and weaning practices of mammals, including humans, because they offer direct proxies for the dietary intake of subadults. Carbon, nitrogen, and oxygen isotopes have been used to evaluate breast milk lipid, protein, and water intake, respectively. Carbon and sulfur isotopes have been used to estimate the content of weaning foods. The elemental concentrations of Sr and Ba in subadult tissues differ because of the dietary change during the weaning process. For analyses, various tissues have been used, such as hair, nail, blood, and feces for modern mammals and bone and teeth for ancient ones. Of these, trace element analysis of tooth enamel offers a good opportunity for the reconstruction of breastfeeding and weaning practices of the more distant past at finer resolution, although further understanding of the metabolism of trace elements is necessary. There are various tissue-and element-specific advantages and disadvantages, and a combination of different proxies can illuminate practices from various viewpoints. Finally, applying the geochemical reconstruction of breastfeeding and weaning practices to human ecology, primatology, and paleoanthropology is important; basic studies of the underlying physiological mechanisms and technical improvements in the analyses will further highlight avenues for future research. Yrbk Phys Anthropol 156:2-21, 2015. V C 2014 American Association of Physical AnthropologistsThe reconstruction of breastfeeding and weaning practices (BWPs) of ancient human and other mammalian species is one of the most important fields in anthropology, archaeology, evolutionary biology, and history. Infant feeding practices affect the overall health of the population because diet, health status, and growth at a young age have profound effects on an individual's later life (Dettwyler and Fishman, 1992;Katzenberg et al., 1996;WHO, 1998WHO, , 2009Lewis, 2007). Breastfeeding and weaning practices can be viewed from the evolutionary perspectives of life history theory, parental investment, child development, social system, and reproductive strat-

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Histological reconstruction of dental development in four individuals from a medieval site in Picardie, France

Cited by 132 publications

References 31 publications

Dental evidence for ontogenetic differences between modern humans and Neanderthals

Dental evidence for ontogenetic differences between modern humans and Neanderthals

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

Reconstruction of breastfeeding and weaning practices using stable isotope and trace element analyses: A review

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