Long anterior mandibular tooth roots in Neanderthals are not the result of their large jaws

Cabec, Adeline Le; Kupczik, Kornelius; Gunz, Philipp; Braga, José; Hublin, Jean‐Jacques

doi:10.1016/j.jhevol.2012.07.003

Cited by 27 publications

(24 citation statements)

References 57 publications

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“…Three‐dimensional landmarks allow a very good characterization of morphological shape changes. The landmarks used in this study are similar to those of several previous works on hominid facial shape (Cobb and O'Higgins, ; Lieberman et al, ; Baab et al, ) and mandibular shape (Rosas and Bastir, ; von Cramon‐Taubadel, ; Le Cabec et al, ). The first data set included 11 landmarks located on the mandibular corpus (Fig.…”

Section: Methodsmentioning

confidence: 55%

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Integration between the face and the mandible of Pongo and the evolution of the craniofacial morphology of orangutans

Neaux

Gilissen

Coudyzer

et al. 2015

American J Phys Anthropol

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Section: Methodsmentioning

confidence: 55%

“… 1–11: mandibular corpus, 12–25: mandibular ramus, 26–40: face. Definitions adapted from Baab et al (), Lieberman et al (), and Le Cabec et al ()…”

Section: Methodsmentioning

confidence: 99%

Integration between the face and the mandible of Pongo and the evolution of the craniofacial morphology of orangutans

Neaux

Gilissen

Coudyzer

et al. 2015

American J Phys Anthropol

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“…This plane was generated in Avizo and was positioned initially from points at the buccal and lingual enamel extensions of the cervix. This plane was then rotated in the mesio‐distal orientation until the cervical axis was established perpendicular to the longitudinal axis of the crown and root trunk (following Le Cabec et al, ). The plane was then translated in a corono‐apical direction until equidistant between the coronal and apical boundaries of the cervical line calculated from image stack numbers (following Olejniczak, ).…”

Section: Methodsmentioning

confidence: 99%

Premolar root and canal variation in extant non‐human hominoidea

Moore

Hublin

Skinner

2015

American J Phys Anthropol

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“…While the application of these methods requires some script writing, this brings the added benefit of flexibility and automaticy, and both MATLAB (Mathworks) and Python, which were used in Rathnayaka et al (2011) and the present study, respectively, are user-friendly languages. Thus, the gradient-based method may represent one of promising options for the 3D surface reconstruction of skulls, although it is not yet widely used in the field of geometric morphometrics (but see Hublin et al, 2017;Le Cabec, Gunz, Kupczik, Braga, & Hublin, 2013;Le Cabec, Kupczik, Gunz, Braga, & Hublin, 2012;Navarro & Maga, 2016;Pan et al, 2017).…”

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confidence: 99%

Effects of different segmentation methods on geometric morphometric data collection from primate skulls

Ito

2019

Methods Ecol Evol

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An increasing number of studies are analysing the shapes of objects using geometric morphometrics with tomographic data, which are often segmented and transformed to three‐dimensional (3D) surface models before measurement. This study aimed to evaluate the effects of different image segmentation methods on geometric morphometric data collection using computed tomography data collected from non‐human primate skulls. Three segmentation methods based on a visually selected threshold, a half‐maximum height protocol and a gradient and watershed algorithm were compared. For each method, the efficiency of surface reconstruction, the accuracy of landmark placement and the level of variation in shape and size compared with various levels of biological variation were evaluated. The visual‐based method inflated the surface in high‐density anatomical regions, whereas the half‐maximum height protocol resulted in a large number of artificial holes and erosion. However, the gradient‐based method mitigated these issues and generated the most efficient surface model. The segmentation method used had a much smaller effect on shape and size variation than interspecific and inter‐individual differences. However, this effect was statistically significant and not negligible when compared with intra‐individual (fluctuating asymmetric) variation. Although the gradient‐based method is not widely used in geometric morphometric analyses, it may be one of promising options for reconstructing 3D surfaces. When evaluating small variations, such as fluctuating asymmetry, care should be taken around combining 3D data that were obtained using different segmentation methods.

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Long anterior mandibular tooth roots in Neanderthals are not the result of their large jaws

Cited by 27 publications

References 57 publications

Integration between the face and the mandible of Pongo and the evolution of the craniofacial morphology of orangutans

Integration between the face and the mandible of Pongo and the evolution of the craniofacial morphology of orangutans

Premolar root and canal variation in extant non‐human hominoidea

Effects of different segmentation methods on geometric morphometric data collection from primate skulls

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