Technical note: Comparing dental topography software using platyrrhine molars

Pampush, James D.; Crowell, Jordan; Karme, Aleksis; Macrae, Scott; Kay, Richard F.; Ungar, Peter S.

doi:10.1002/ajpa.23797

Cited by 10 publications

(11 citation statements)

References 27 publications

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“…[15] followed the protocol put forth by [9,35], which utilized raster-based grid data, essentially making the tooth 2.5D, and here, OPCR was calculated using a 3D polygonal mesh [12]. These results confirm the conclusions of [16,36,37], that OPCR values gathered with these two methodologies are not directly comparable.…”

Section: Discussionsupporting

confidence: 61%

Ambient occlusion and PCV (portion de ciel visible): A new dental topographic metric and proxy of morphological wear resistance

2019

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Recently, ambient occlusion, quantified through portion de ciel visible (PCV) was introduced as a method for quantifying dental morphological wear resistance and reconstructing diet in mammals. Despite being used to reconstruct diet and investigate the relationship between dental form and function, no rigorous analysis has investigated the correlation between PCV and diet. Using a sample of platyrrhine and prosimians M 2 s, we show average PCV was significantly different between most dietary groups. In prosimian, insectivores had the lowest PCV, followed by folivores, omnivores, frugivores, and finally hard-object feeders. In platyrrhines, omnivores had the lowest average PCV, followed by folivores, frugivores, and finally hard-object feeders. PCV was correlated to two topographic variables (Dirichlet normal energy, DNE, and relief index, RFI) but uncorrelated to three others (orientation patch count rotated, OPCR, tooth surface area, and tooth size). The OPCR values here differed greatly from previously published values using the same sample, showing how differences in data acquisition (i.e., using 2.5D vs. 3D surfaces) can lead to drastic differences in results. Compared to other popular topographic variables, PCV performed as well or better at predicting diet in these groups, and when combined with a metric for size, the percent of successful dietary classifications reached 90%. Further, using an ontogenetic series of hominin ( Paranthropus robustus ) M 2 s, we show that PCV correlates well with probability of wear, with PCV values being higher on the portions of the occlusal surface that experience more wear (e.g., cusps and crest tips, wear facets) than the portions of the tooth that experience less. This relationship is strongest once wear facets have begun to form on the occlusal surface. These results highlight the usefulness of PCV in quantifying morphological wear resistance and predicting diet in mammals.

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Section: Discussionsupporting

confidence: 61%

Ambient occlusion and PCV (portion de ciel visible): A new dental topographic metric and proxy of morphological wear resistance

2019

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“…For example, DNE, 41 angularity, 40 and curvature 43 all measure tooth curviness/sharpness, but differences in the mathematics behind these metrics mean that values cannot be interchanged, with the correlation between variable being potentially extremely weak (e.g., in platyrrhines, DNE and angularity are weakly linearly correlated, p = .018, r 2 = 0.043). 56 While several methods exist for measuring the same aspect of dental morphology, it is difficult to pick the "best" metric for quantifying a distinct aspect of dental morphology, as the relationship between dental shape quantified through dental topography and diet can vary between clades. 6 For example, DNE is effective at differentiating molars of folivorous from frugivorous platyrrhines, 6 but angularity is not.…”

Section: Comparability Of Topographic Metricsmentioning

confidence: 99%

“…Most topographic metrics are sensitive to data acquisition and processing 41,42,49,52,56,73,74 (Box 3). Due to time constraints, sensitivity studies generally investigate the effect of one or two parameters (e.g., triangle count, 42,73 smoothing, 10,49 cropping 41,75 ) on one tooth.…”

Section: Sensitivity To Data Acquisition and Processingmentioning

confidence: 99%

“…An increased understanding of metric comparability, particularly of metrics that quantify similar aspects of dental form, is needed for study comparability. 56 Ideally, a standardized methodology for performing analyses, complete with a standardized set of metrics that are functionally significant, will also be developed and adapted.…”

Section: Standardization Of Metricsmentioning

confidence: 99%

“…New metrics may not be needed, unless they can quantify other aspects of dental form currently being ignored, or aspects of dental form directly related to masticatory performance. An increased understanding of metric comparability, particularly of metrics that quantify similar aspects of dental form, is needed for study comparability 56 . Ideally, a standardized methodology for performing analyses, complete with a standardized set of metrics that are functionally significant, will also be developed and adapted.…”

Section: The Next 20 Yearsmentioning

confidence: 99%

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The landscape of tooth shape: Over 20 years of dental topography in primates

Berthaume

Lazzari

Guy

2020

Evolutionary Anthropology

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Diet plays an incontrovertible role in primate evolution, affecting anatomy, growth and development, behavior, and social structure. It should come as no surprise that a myriad of methods for reconstructing diet have developed, mostly utilizing the element that is not only most common in the fossil record but also most pertinent to diet: teeth. Twenty years ago, the union of traditional, anatomical analyses with emerging scanning and imaging technologies led to the development of a new method for quantifying tooth shape and reconstructing the diets of extinct primates. This method became known as dental topography.

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