Assessing the reliability of virtual reconstruction of mandibles

Godinho, Ricardo Miguel; O’Higgins, Paul; Gonçalves, Célia

doi:10.1002/ajpa.24095

Cited by 6 publications

(5 citation statements)

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“…Digital models are now routinely used in bioanthropological and palaeoanthropological research to examine, for example, skeletal morphology (Freidline et al, 2012; Freidline et al, 2013; Katz et al, 2017; von Cramon‐Taubadel, 2011), dental morphology (Fornai et al, 2015; Fornai et al, 2016; Gómez‐Robles et al, 2015; Martinón‐Torres et al, 2013; Sarig et al, 2019), skeletal mechanical function (Godinho et al, 2017; Godinho, Fitton, et al, 2018; Godinho & O'Higgins, 2018; Godinho, Spikins, & O'Higgins, 2018), respiratory function (Bastir et al, 2015; Bastir et al, 2020; García‐Martínez et al, 2018; Wroe et al, 2018), heat‐induced dental morphological changes (Godinho et al, 2019; Sandholzer et al, 2013; Sandholzer et al, 2014) and to reconstruct incomplete specimens (Godinho et al, 2020; Godinho & O'Higgins, 2017; Gunz et al, 2009; Gunz et al, 2020; O'Higgins et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…, skeletal mechanical function Godinho, Fitton, et al, 2018;Godinho, Spikins, & O'Higgins, 2018), respiratory function (Bastir et al, 2015;Bastir et al, 2020;García-Martínez et al, 2018;Wroe et al, 2018), heat-induced dental morphological changes (Godinho et al, 2019;Sandholzer et al, 2013;Sandholzer et al, 2014) and to reconstruct incomplete specimens (Godinho et al, 2020;Gunz et al, 2009;Gunz et al, 2020;O'Higgins et al, 2019).…”

mentioning

confidence: 99%

“…and to reconstruct incomplete specimens (Godinho et al, 2020;Gunz et al, 2009;Gunz et al, 2020;O'Higgins et al, 2019).…”

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confidence: 99%

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Testing the reliability of CT scan‐based dental wear magnitude scoring

Godinho

Gonçalves

2021

American J Phys Anthropol

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Objectives Digital models are now frequently used in biological anthropology (bioanthropology) research. Despite several studies validating this type of research, none has examined if the assessment of dental wear magnitude based on Computerized Tomography (CT) scans is reliable. Thus, this study aims to fill this gap and assess if dental wear magnitude scoring based on CT scans provides results consistent with scoring based on direct observation of the physical specimens. Materials and Methods Dental wear magnitude from 412 teeth of 35 mandibles originating from the Portuguese Muge and Sado Mesolithic shell‐middens was scored. The mandibles were also CT scanned and visualized using 3D Slicer. CT scan‐based scoring of dental wear magnitude was then undertaken. Two scoring rounds were undertaken for each observation method (totaling four scoring rounds) and an intra‐observer error test was performed. The averaged results of the two observation methods were compared via boxplots with paired cases. Results Intra‐observer error was negligible and non‐significant. Scoring results are comparable between the two observation methods. Notwithstanding, some differences were found, in which CT scan assessment generally overestimates dental wear when compared to direct observation. Discussion Our results generally validate the use of CT scans in studies of dental wear magnitude. Notwithstanding several caveats relating to CT scanning and visualization limitations should be considered to avoid over or under‐estimation of dental wear.

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Section: Introductionmentioning

confidence: 99%

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Testing the reliability of CT scan‐based dental wear magnitude scoring

Godinho

Gonçalves

2021

American J Phys Anthropol

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“…The former reconstruction approach was chosen because previous studies also show that using inadequate references (i.e., references from populations that are morphologically meaningfully different from the target reconstructed specimens) may lead to large estimation errors 112 – 114 . Even though 66 hemi-mandibles were partially reconstructed using this approach (Table SI 3 ), many other specimens were excluded because reconstruction of excessively incomplete mandibles (i.e., with more than ~ 5 missing LMs when using the LM set of this study) may result in meaningful reconstruction error and so in biased results 115 .…”

Section: Methodsmentioning

confidence: 99%

Mandibular morphology and the Mesolithic–Neolithic transition in Westernmost Iberia

Godinho,

Umbelino,

Valera

et al. 2023

Sci Rep

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Neolithic farming and animal husbandry were first developed in the Near East ~ 10,000 BCE and expanded westwards, reaching westernmost Iberia no later than 5500 BCE. It resulted in major social, cultural, economic and dietary changes. Yet, the impact of this change on human mandibular morphology in Iberia is yet to be assessed, which is regrettable because mandible form is impacted by population history and diet. In this study we used Mesolithic to Chalcolithic Iberian samples to examine the impact of this transition on mandibular morphology. We also compared these samples with a Southern Levantine Chalcolithic population to assess their relationship. Lastly, we assessed dental wear to determine if the morphological differences identified were related to the material properties of the diet. We found differences between samples in mandibular shape but not size, which we attribute to contrasting population histories between Mesolithic and later populations. Some differences in the severity of dental wear were also found between Mesolithic and later Iberian samples, and smaller between the Mesolithic Iberians and southern Levantines. Little relationship was found between wear magnitude and mandibular shape. Altogether, our results show that the Mesolithic–Neolithic Iberian transition resulted in a meaningful change in mandibular morphology, which was likely driven more by population history than by dietary change.

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“…One of the digital methods that has been proposed as one of the most accurate for reconstructing incomplete bones is RM. The RM shows fewer estimation errors than other commonly used digital methods in paleoanthropology (e.g., thin plate spline) [ 2 , 6 , 8 , 9 ] when a large reference sample size is available, and it makes use of more biological information as it considers the patterns of variation and covariation among the landmark positions [ 10 ]. In this method, the shape of the bones is studied through geometric morphometrics and the coordinates of each landmark are regressed on all other landmarks from the set of undamaged specimens.…”

Section: Introductionmentioning

confidence: 99%

Digital Reconstructions Using Linear Regression: How Well Can It Estimate Missing Shape Data from Small Damaged Areas?

Bucchi

Bove

López-Lázaro

et al. 2022

Biology

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Skeletal remains analyzed by anthropologists, paleontologists and forensic scientists are usually found fragmented or incomplete. Accurate estimations of the original morphologies are a challenge for which several digital reconstruction methods have been proposed. In this study, the accuracy of reconstructing bones based on multiple linear regression (RM) was tested. A total of 150 digital models from complete zygomatics from recent past populations (European and African American) were studied using high-density geometric morphometrics. Some landmarks (i.e., 2, 3 and 6) were coded as missing to simulate incomplete zygomatics and the missing landmarks were estimated with RM. In the zygomatics, this simulated damage affects a few square centimeters or less. Finally, the predicted and original shape data were compared. The results indicate that the predicted landmark coordinates were significantly different from the original ones, although this difference was less than the difference between the original zygomatic and the mean zygomatic in the sample. The performance of the method was affected by the location and the number of missing landmarks, with decreasing accuracy with increasing damaged area. We conclude that RM can accurately estimate the original appearance of the zygomatics when the damage is small.

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Assessing the reliability of virtual reconstruction of mandibles

Abstract: This is a repository copy of Assessing the reliability of virtual reconstruction of mandibles.

Cited by 6 publications

References 46 publications

Testing the reliability of CT scan‐based dental wear magnitude scoring

Testing the reliability of CT scan‐based dental wear magnitude scoring

Mandibular morphology and the Mesolithic–Neolithic transition in Westernmost Iberia

Digital Reconstructions Using Linear Regression: How Well Can It Estimate Missing Shape Data from Small Damaged Areas?

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