Morphological comparison of the enamel–dentine junction and outer enamel surface of molars using a micro-computed tomography technique

Morita, Wataru

doi:10.1016/j.job.2016.02.001

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…There is also considerable metameric variation in EDJ morphology, and humans frequently express greater variation along the tooth row of a single individual than between individuals (39, 44). Metameric variation in EDJ morphology increases along the molar row, consistent with studies on other dental traits in primates (25,40,41,47,59). Given this reported variation, it has become essential to understand the extent of disparity in EDJ morphology before this well-preserved phenotype can be utilized in archaeological and paleontological investigations of taxonomy and evolution.…”

Section: Significancesupporting

confidence: 83%

“…This is particularly notable in archaic and fossil populations, as well as contemporary human populations with a nonindustrialized, processed diet, limiting the utility of these morphologies in many studies (34)(35)(36)(37). With advances in scanning technologies alleviating the need for destructive analyses (38,39), greater attention has now been placed on the internal morphology of teeth (34)(35)(36)(40)(41)(42).…”

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confidence: 99%

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Neutral evolution of human enamel–dentine junction morphology

Monson

Fecker

Scherrer

2020

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

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Teeth have been studied for decades and continue to reveal information relevant to human evolution. Studies have shown that many traits of the outer enamel surface evolve neutrally and can be used to infer human population structure. However, many of these traits are unavailable in archaeological and fossil individuals due to processes of wear and taphonomy. Enamel–dentine junction (EDJ) morphology, the shape of the junction between the enamel and the dentine within a tooth, captures important information about tooth development and vertebrate evolution and is informative because it is subject to less wear and thus preserves more anatomy in worn or damaged specimens, particularly in mammals with relatively thick enamel like hominids. This study looks at the molar EDJ across a large sample of human populations. We assessed EDJ morphological variation in a sample of late Holocene modern humans (n = 161) from archaeological populations using μ-CT biomedical imaging and geometric morphometric analyses. Global variation in human EDJ morphology was compared to the statistical expectations of neutral evolution and “Out of Africa” dispersal modeling of trait evolution. Significant correlations between phenetic variation and neutral genetic variation indicate that EDJ morphology has evolved neutrally in humans. While EDJ morphology reflects population history, its global distribution does not follow expectations of the Out of Africa dispersal model. This study increases our knowledge of human dental variation and contributes to our understanding of dental development more broadly, with important applications to the investigation of population history and human genetic structure.

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Section: Significancesupporting

confidence: 83%

mentioning

confidence: 99%

Neutral evolution of human enamel–dentine junction morphology

Monson

Fecker

Scherrer

2020

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

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“…All models based on the three-state system data yielded non-significant results. This could be due to thicker enamel in the M1 (Gantt, Harris, Rafter, & Rahn, 2001;Grine, 2002Grine, , 2005) that may mask expressions visible at the EDJ (see Bailey, Skinner, & Hublin, 2011;Morita, 2016;Ortiz et al, 2012;Skinner et al, 2008). In a sample of 35 Homo sapiens permanent maxillary molars, Ortiz (2016) found a weak positive relationship between RICD and Carabelli's trait expression, counter to PCM predictions.…”

Section: Discussionmentioning

confidence: 99%

“…In our sample, Carabelli's trait was more often absent on M1 where dm2 was scored present for low expression (Figure 4). This could be due to thicker enamel in the M1 (Gantt, Harris, Rafter, & Rahn, 2001;Grine, 2002Grine, , 2005 that may mask expressions visible at the EDJ (see Bailey, Skinner, & Hublin, 2011;Morita, 2016;Ortiz et al, 2012;Skinner et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

The Patterning Cascade Model and Carabelli's trait expression in metameres of the mixed human dentition: exploring a morphogenetic model

Paul

Astorino

Bailey

2016

American J Phys Anthropol

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We found mixed support for the PCM's ability to explain differences in Carabelli's trait expression between metameres of the mixed molar row. Results suggest that protocone-paracone enamel knot spacing has the greatest influence on Carabelli's trait expression. Lack of statistical significance for many of the relationships explored may reflect limitations related to sample composition and sample size.

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“…Nowadays, high‐resolution micro‐computed tomography (microCT) scans allow for the non‐invasive exploration of inner dental structures, such as the enamel‐dentine junction (EDJ), which is especially advantageous when working with fossils that are rare and often fragile (Macchiarelli & Bailey, ; Macchiarelli et al, 2013). EDJ and outer enamel surface (OES) morphology are generally highly correlated (Morita, ), allowing the study of crown morphological features on teeth that would have been excluded from the study because of their degree of enamel wear or fractures.…”

Section: Introductionmentioning

confidence: 97%

Dentine morphology of Atapuerca‐Sima de los Huesos lower molars: Evolutionary implications through three‐dimensional geometric morphometric analysis

Hanegraef

Martinón‐Torres

Pinillos

et al. 2018

American J Phys Anthropol

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Our results are compatible with the idea that multiple evolutionary lineages or populations coexisted in Europe during the Middle Pleistocene, with the SH paradigm phylogenetically closer to Homo neanderthalensis. Further research could support the possibility of SH as a separate taxon. Alternatively, SH could be a subspecies of Neanderthals, with the variability of this clade being remarkably higher than previously thought.

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Morphological comparison of the enamel–dentine junction and outer enamel surface of molars using a micro-computed tomography technique

Cited by 8 publications

References 33 publications

Neutral evolution of human enamel–dentine junction morphology

Neutral evolution of human enamel–dentine junction morphology

The Patterning Cascade Model and Carabelli's trait expression in metameres of the mixed human dentition: exploring a morphogenetic model

Dentine morphology of Atapuerca‐Sima de los Huesos lower molars: Evolutionary implications through three‐dimensional geometric morphometric analysis

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