Wear and its effects on dental topography measures in howling monkeys (<i>Alouatta palliata</i>)

Pampush, James D.; Spradley, Jackson P; Morse, Paul; Harrington, Arianna; Allen, Kari; Boyer, Douglas; Kay, Richard F.

doi:10.1002/ajpa.23077

Cited by 41 publications

(50 citation statements)

References 83 publications

(204 reference statements)

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“…Up until now, there have been two outstanding issues with DNE's implementation, both likely arising from confusion regarding mesh preparation. First, published DNE analysis has only been performed by a narrow set of researchers connected to a small number of research groups including Boyer and Winchester (e.g., Bunn et al, ; Ledogar, Winchester, St. Clair, & Boyer, ; Prufrock, Boyer, & Silcox, ; Winchester, ; Winchester et al, ) and Pampush and Kay (e.g., Pampush et al, ; this study) suggesting that the method has remained somewhat inaccessible. Second, every study utilizing DNE has used a slightly different protocol to produce and analyze 3D meshes, raising concerns about the comparability and repeatability of results (Pampush et al, ).…”

Section: Introductionmentioning

confidence: 87%

“…DNE is an integral measure of the collective “sharpness” of a surface (Pampush et al, ; Winchester, ). As such, it has the advantage of being unaffected by differences in the size of a structure, or its orientation [unlike RFI (which relies on a ratio of two area measurements and will differ depending on the orientation of the tooth relative to a somewhat arbitrary defined occlusal plane), or OPCR (whose aggregate “face‐count” is also dependent on specimen orientation)].…”

Section: Introductionmentioning

confidence: 99%

“…Retriangulation is a necessary step meant to offset surface noise captured during scanning and segmentation. There are already established protocols for minimizing error introduced during initial scanning, reconstruction, and segmentation (Boyer, ; Pampush et al, ; Winchester et al, ). However, issues related to the effects of mesh retriangulation remain underdescribed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy

Spradley¹,

Pampush²,

Morse

et al. 2017

American J Phys Anthropol

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Different retriangulation protocols yield different DNE values for the same surfaces, and should not be combined in meta-analyses. Increasing face count will capture surface microfeatures, but at the expense of computational speed. More aggressive smoothing is more likely to alter the essential geometry of the surface. A protocol is proposed that limits potential artifacts created during surface production while preserving pertinent features on the occlusal surface.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy

Spradley¹,

Pampush²,

Morse

et al. 2017

American J Phys Anthropol

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“…Establishment of trophic relationships in extant (Herrel et al., 2010; Kato et al., 2014; Pampush et al., 2016; Renaud et al., 2015; Self, 2015; Soons et al., 2015) and extinct species (Collareta et al., 2015; Gill et al., 2014) has also been possible by analysis of gut content, beak shape, or dental wear patterns.…”

Section: Application Of X‐ray Computed Tomography In Ecological Studiesmentioning

confidence: 99%

“…Another field with considerable usage of X-ray CT is the study of social insects and their nest or gallery systems. Here, images are primarily acquired in vivo allowing to scan the same nest or colony several times during its developmental cycle (Eyer, Neumann, & Dietemann, 2016 Establishment of trophic relationships in extant (Herrel et al, 2010;Kato et al, 2014;Pampush et al, 2016;Renaud et al, 2015;Self, 2015;Soons et al, 2015) and extinct species (Collareta et al, 2015;Gill et al, 2014) has also been possible by analysis of gut content, beak shape, or dental wear patterns.…”

Section: Interestingly Ecology Was Included As "Environmental Sciencesmentioning

confidence: 99%

X‐ray computed tomography and its potential in ecological research: A review of studies and optimization of specimen preparation

Gutiérrez

Ott

Töpperwien

et al. 2018

Ecology and Evolution

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Imaging techniques are a cornerstone of contemporary biology. Over the last decades, advances in microscale imaging techniques have allowed fascinating new insights into cell and tissue morphology and internal anatomy of organisms across kingdoms. However, most studies so far provided snapshots of given reference taxa, describing organs and tissues under “idealized” conditions. Surprisingly, there is an almost complete lack of studies investigating how an organism′s internal morphology changes in response to environmental drivers. Consequently, ecology as a scientific discipline has so far almost neglected the possibilities arising from modern microscale imaging techniques. Here, we provide an overview of recent developments of X‐ray computed tomography as an affordable, simple method of high spatial resolution, allowing insights into three‐dimensional anatomy both in vivo and ex vivo. We review ecological studies using this technique to investigate the three‐dimensional internal structure of organisms. In addition, we provide practical comparisons between different preparation techniques for maximum contrast and tissue differentiation. In particular, we consider the novel modality of phase contrast by self‐interference of the X‐ray wave behind an object (i.e., phase contrast by free space propagation). Using the cricket Acheta domesticus (L.) as model organism, we found that the combination of FAE fixative and iodine staining provided the best results across different tissues. The drying technique also affected contrast and prevented artifacts in specific cases. Overall, we found that for the interests of ecological studies, X‐ray computed tomography is useful when the tissue or structure of interest has sufficient contrast that allows for an automatic or semiautomatic segmentation. In particular, we show that reconstruction schemes which exploit phase contrast can yield enhanced image quality. Combined with suitable specimen preparation and automated analysis, X‐ray CT can therefore become a promising quantitative 3D imaging technique to study organisms′ responses to environmental drivers, in both ecology and evolution.

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Technical note: Comparing dental topography software using platyrrhine molars

Pampush

Crowell

Karme

et al. 2019

American J Phys Anthropol

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Objectives: There remain many idiosyncrasies among the values calculated for varying dental topography metrics arising from differences in software preferences among research groups.The aim of this work is to compare and provide potential conversion formulae for dental topography metrics calculated using differing software platforms. Methods: Three software packages: ArcGIS, Surfer Manipulator, and molaR were used to calculate orientation patch count rotated (OPCR), Dirichlet normal energy (DNE), occlusal relief (OR), slope (m), and angularity (a) on platyrrhine second upper molars. Values derived from the various software packages were compared for distributional consistency and correlation. Where appropriate, formulae for conversion between like measures calculated on different software platforms were developed.Results: When compared with the same measurement across software, OPCR, OR, and slope were all highly correlated. However, only OR demonstrated distributional consistency (i.e., nearly consistent mean, median, max, and min). Slope and OPCR were both higher when calculated by molaR as compared to Surfer Manipulator and ArcGIS calculations, conversion formulae are provided for these measures. DNE is only weakly correlated with angularity; but is correlated with orientation patch count across taxa. Discussion:We explore why there is variation in the dental topography values calculated among the various software packages. The conversion formulae provided in this work will make possible direct comparisons among studies conducted across multiple research groups.

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Wear and its effects on dental topography measures in howling monkeys (Alouatta palliata)

Cited by 41 publications

References 83 publications

Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy

Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy

X‐ray computed tomography and its potential in ecological research: A review of studies and optimization of specimen preparation

Technical note: Comparing dental topography software using platyrrhine molars

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