The physiological linkage between molar inclination and dental macrowear pattern

Wiley - Tập 166 Số 4 - Trang 941-951 - 2018
Gregorio Oxilia1,2,3, Eugenio Bortolini2, Sergio Martini4, Andrea Papini5, Marco Boggioni6, Laura Buti2, Carla Figus2, Rita Sorrentino7,2, Grant C. Townsend8, John Kaidonis8, Luca Fiorenza9,10, Emanuela Cristiani3, Ottmar Kullmer11,12, Jacopo Moggi‐Cecchi1, Stefano Benazzi2,13
1Department of Biology University of Florence, Via del Proconsolo, 12 Firenze 50122 Italy
2Department of Cultural Heritage, University of Bologna, Via Degli Ariani 1, Ravenna, 48121, Italy
3Department of Oral and Maxillo Facial Sciences Sapienza University, Via Caserta 6 Roma 00161 Italy
4Dental Lab Technician, via Milani, 1 Parona Verona 37124 Italy
5Dentist's Surgery, via Walter Tobagi 35 Prato 59100 Italy
6Dentist's Surgery, via D'Andrade 34/207 Genova Sestri Ponente 16154 Italy
7Department of Biological, Geological and Environmental Sciences—BiGeA University of Bologna, Via Selmi 3 Bologna 40126 Italy
8Adelaide Dental School, The University of Adelaide, Adelaide, Australia
9Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
10Earth Sciences, University of New England, Armidale, NSW, 2351, Australia
11Department of Paleobiology and Environment Institute of Ecology, Evolution, and Diversity, Johann Wolfgang Goethe University, Max‐von‐Laue‐Str. 13 Frankfurt 60438 Germany
12Senckenberg Research Institute, Senckenberganlage 25 Frankfurt am Main 60325 Germany
13Department of human evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig 04103, Germany

Tóm tắt

AbstractObjectivesExact symmetry and perfect balance between opposite jaw halves, as well as between antagonistic teeth, is not frequently observed in natural masticatory systems. Research results show that asymmetry in our body, skull, and jaws is often related to genetic, epigenetic, environmental and individual ontogenetic factors. Our study aims to provide evidence for a significant link between masticatory asymmetry and occlusal contact between antagonist teeth by testing the hypothesis that tooth inclination is one of the mechanisms driving distribution of wear in masticatory phases in addition to dietary and cultural habits.Materials and MethodsThe present work investigates the relationship between dental macrowear patterns and tooth inclinations on a sample of complete maxillary and mandibular 3D models of dental arches from 19 young and adult Yuendumu Aboriginal individuals. The analysis was carried out on first molars (M1) from all quadrants. Occlusal Fingerprint Analysis was used for the quantification of macrowear patterns, and 2D cross‐sectional geometric analysis was carried out to investigate asymmetry in dental arches.ResultsThe asymmetry is highly variable on both arches, and it is associated with differences in the inclination of upper M1 crowns. Each molar has variable inclination (buccal/lingual) which influence tooth to tooth contact, producing greater or lesser variation in wear pattern. Interindividual variability of morphological variation of the occlusal relationship has to be considered in macrowear analysis.DiscussionOur results suggest that overall asymmetry in the masticatory apparatus in modern humans affects occlusal contact areas between antagonist teeth influencing macrowear and chewing efficiency during ontogeny.

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