Tooth wear and diversity in early hominid molars: A case study

Ulhaas, Lilian; Kullmer, Ottmar; Schrenk, Friedemann

doi:10.1007/978-1-4020-5845-5_24

Cited by 21 publications

(31 citation statements)

References 37 publications

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“…4), as described for human molars in normal occlusion Schneck, 1981, 1982;Ulhaas et al, 2007;Schulz, 2008;Kullmer et al, 2009). Complementary facet pairs 1-12 were observed on the maxillary and the mandibular M1's.…”

Section: Resultsmentioning

confidence: 99%

“…Surface data were acquired by the optical topometry system SMARTSCAN (Breuckmann GmbH) with a resolution of $ 55 lm (Kullmer et al, 2002(Kullmer et al, , 2009Ulhaas et al, 2004Ulhaas et al, , 2007. Polygonal surface models were generated using OPTOCAT (Breuckmann GmbH).…”

Section: Methodsmentioning

confidence: 99%

“…His ''Angle Class I'' defines a normal occlusal relationship which produces the common pattern of contact positions characteristic of the bunodont dryopithecine tooth morphology (Maier and Schneck, 1981;Ulhaas et al, 2007;Kullmer et al, 2009). A stereotypic motion of the lower jaw was described as a general feature of the primate masticatory cycle Kay, 1972, 1973;Kay and Hiiemae, 1974;Kay, 1977;Maier, 1977Maier, , 1978Maier, , 1984, from which a maximum of 13 complementary facet pairs develop on the molar occlusal surface (Maier and Schneck, 1981).…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Approach to Evaluate the Correspondence Between Wear Facet Position and Occlusal Movements

Kullmer

Schulz²,

Benazzi

2012

The Anatomical Record

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The position of dental wear facets depends on crown morphology, antagonistic relation, and occlusal movements. The correspondence between specific directions of movements and the position of wear facets cannot be easily evaluated in vivo and has never been tested experimentally. An experimental analysis was carried out to provide evidence that explicit occlusal movements are responsible for the spatial position of wears facets. Unworn dental stone replicas of modern human prosthetic molar were mounted in a physical dental articulator, and the upper dental arch was ground against the lowers to create a wear facet pattern. The relief guided movements were constrained sequentially by means of three different condyle box setups: (1) experienced-based mean values for sagittal condyle inclination, lateroretrusion, Benett angle, and transversal condyle inclination were used; (2) pure retrusion and immediate side shift movements were added; (3) retrusion and immediate side shift were increased. Finally, the upper and lower first molars were surface scanned and macrowear facets were quantified in four wear stages. The results show that a wear facet pattern was created similar to what is seen on human molars in vivo occlusion. Some facets only developed if specific directions of movement were carried out. Therefore, we posit that an analysis of wear facet patterns is useful in recreating the individual occlusal movements. This information can be used not only to guide reproducible functional reconstructions of crown relief and dental arches but also to deduce jaw movements when, for example, isolated primate teeth are discovered in paleontological contexts. Anat Rec, 295:846-852, 2012. V C 2012 Wiley Periodicals, Inc.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Experimental Approach to Evaluate the Correspondence Between Wear Facet Position and Occlusal Movements

Kullmer

Schulz²,

Benazzi

2012

The Anatomical Record

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“…The OFA method has been successfully used to detect information on the diets of modern hunter-gatherer groups, fossil primates and Pleistocene humans [Ulhaas et al, 2007;Kullmer et al, 2009;Fiorenza et al, 2011cFiorenza et al, , 2015aHarvati et al, 2013;Kullmer et al, 2013;Fiorenza, 2015]. Furthermore, a few preliminary analyses have investigated the relationship between macrowear and diet in non-human primates, showing the potentials of this method [Fiorenza et al, 2014[Fiorenza et al, , 2015b.…”

Section: Discussionmentioning

confidence: 99%

“…The OFA method can be simply summarized into 3 major steps: model orientation, facet identification and calculation of the facet inclination. The polygonal models of teeth have been initially oriented using reference planes created along their cervical line [Ulhaas et al, 2007;Kullmer et al, 2009]. Wear facets have been manually outlined onto the polygonal surface, and their planes calculated through the least square best-fit method [Fiorenza et al, 2010[Fiorenza et al, , 2011aFiorenza, 2015] ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Tooth Wear Inclination in Great Ape Molars

Knight-Sadler¹,

Fiorenza²

2017

IJFP

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Primate dietary diversity is reflected in their dental morphology, with differences in size and shape of teeth. In particular, the tooth wear angle can provide insight into a species' ability to break down certain foods. To examine dietary and masticatory information, digitized polygon models of dental casts provide a basis for quantitative analysis of wear associated with tooth attrition. In this study, we analyze and compare the wear patterns of Pongo pygmaeus, Gorilla gorillagorilla and Pan troglodytes schweinfurthii lower molars, focusing on the degree of inclination of specific wear facets. The variation in wear angles appears to be indicative of jaw movements and the specific stresses imposed on food during mastication, reflecting thus the ecology of these species. Orangutans exhibit flatter wear angles, more typical of a diet consisting of hard and brittle foods, while gorillas show a wear pattern with a high degree of inclination, reflecting thus their more leafy diet. Chimpanzees, on the other hand, show intermediate inclinations, a pattern that could be related to their highly variable diet. This method is demonstrated to be a powerful tool for better understanding the relationship between food, mastication and tooth wear processes in living primates, and can be potentially used to reconstruct the diet of fossil species.

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Technical note: Occlusal fingerprint analysis: Quantification of tooth wear pattern

Kullmer

Benazzi

Fiorenza

et al. 2009

American J Phys Anthropol

100

164

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Information about food ingestion and mastication behavior during the lifespan of an individual is encoded in the dental occlusal wear pattern. To decode this information, we describe a new method called occlusal fingerprint analysis (OFA). Structural parameters of wear facets on the occlusal surface of teeth are quantified from digitized casts for the interpretation of occlusal aspects. The OFA provides an individual three-dimensional dental occlusal compass that indicates the major pathways of interaction between antagonists, revealing information about development, spatial position, and enlargement of wear facets. Humans develop a very similar overall pattern of crown contacts, although specific characteristics of wear facets reflect an individual's occlusal relationships and masticatory behavior. We hypothesize that the wear pattern is a unique character and therefore valuable for individual identification. Furthermore we suggest that OFA, when further developed, may be useful for identification of behavioral, biological, and chemical factors affecting crown morphology.

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Tooth wear and diversity in early hominid molars: A case study

Cited by 21 publications

References 37 publications

An Experimental Approach to Evaluate the Correspondence Between Wear Facet Position and Occlusal Movements

An Experimental Approach to Evaluate the Correspondence Between Wear Facet Position and Occlusal Movements

Tooth Wear Inclination in Great Ape Molars

Technical note: Occlusal fingerprint analysis: Quantification of tooth wear pattern

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