Society of Vertebrate Paleontology (SVP) 72st Annual Meeting

Karme, A. (Posteriesitys)

Aktiviteetti: Tapahtumaan osallistumisen ja tapahtuman järjestämisen tyypitKonferensseihin, kursseille ja seminaareihin osallistuminen ja näiden järjestäminen

Kuvaus

Artificial chewing with real teeth

Karme, A., Kallonen, A., Galambosi, S., Engström, P., Fortelius, M., 2012. Artificial chewing with real teeth. Society of Vertebrate Paleontology 2012 Program and Abstracts. In remarkable contrast to the widespread use of tooth wear in paleodiet and paleoenvironment reconstruction there has been very little experimental study of the causes of different tooth wear types. We have therefore built an artificial chewing apparatus for simulating wear on real teeth under controlled circumstances of mechanical mastication. The core design principle of the machine is repeated, full-occlusion single stroke movement. The majority of the device design was done with CAD-modeling, and the needed parts were then milled from stainless steel. The electric motor and power source were selected to be easily obtainable and affordable. An in-house designed water-cooling system for the motor was built to facilitate long-term testing and allow high number of chewing cycle repetitions. Full adjustment of the occlusion and chewing force are available for experiments. The setup is reasonably sized, weighing in total less than 5 kg, which in addition to the affordability of the component parts should allow easy and flexible use. Teeth worn with the chewing machine were first cut straight and polished to a flat and even “occlusal” surface for the initial experiments. Horse teeth were selected for their hypsodonty and compact structure,with enamel, dentine and cement almost uniformly distributed along the tooth’s height. Mastication was performed with and without abrasive substances. Mastication without abrasive substances was done in a pure water medium, whereas a viscous glycerin- based liquid was used to keep the particles in suspension when abrasive substances were introduced. Teeth were subjected to over 200 000 chews during a time span of 60 hours. Results were estimated visually and quantitatively using 3D-scan data. Elevation, slope, aspect and facet development were quantified and estimated from the worn surface using GIS techniques. In pure attrition, facet development and differential wear to dentine, cement and enamel was observed, whereas in abrasion results were dominated by the added particles, which induced rounded wear surfaces and clear overwriting striations.
Aikajakso14 lokakuuta 2012 - 23 lokakuuta 2012
Tapahtuman tyyppiMuu
SijaintiRaleigh, NC, Yhdysvallat (USA)
Tunnustuksen arvoKansainvälinen