Examinando por Materia "Fracture toughness"
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Ítem Una alternativa para el estudio de los dientes humanos(Universidad EAFIT, 2020-12-01) Martinez Guerrero, Christian Alexander; Martinez-Guerrero, Christian Alexander; Arango Santander, Santiago; Carolina, Montoya; Pelaez, Vargas Alejandro; Ossa, Edgar Alexander; Materiales de IngenieríaÍtem Chemical, structural and mechanical characterization of bovine enamel(PERGAMON-ELSEVIER SCIENCE LTD, 2020-01-01) Arango-Santander S.; Montoya C.; Pelaez-Vargas A.; Ossa E.A.; Arango-Santander S.; Montoya C.; Pelaez-Vargas A.; Ossa E.A.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de IngenieríaObjective: The purpose of this investigation was to establish microstructure, microhardness, fracture toughness, chemical composition, and crack repair of bovine enamel and to compare these features with their human counterparts. Design: Bovine enamel fragments were prepared and optical microscopy and atomic force microscopy were used to establish microstructure; Raman spectroscopy was used to estimate composition and microindentation using Vickers testing was performed to evaluate hardness. Results: A strong dependence between indentation load and microhardness values was observed, as was the case in human enamel. Similar microstructure and chemical composition between bovine and human enamel, 7.89% lower microhardness and 40% higher fracture toughness values for bovine enamel were found. Conclusion: From a structural and mechanical standpoint, bovine enamel is a suitable alternative to human enamel for in vitro testing of dental products. © 2019 Elsevier LtdÍtem Dientes bovinos: una alternativa para implantes dentales humanos(2021-04-05) Martinez Guerrero, Christian Alexander; Christian Alexander Martinez-Guerrero; Arango Santander, Santiago; Montoya, Carolina; Pelaez Vargas, Alejandro; Ossa, Alexander; Vicerrectoría de Descubrimiento y CreaciónÍtem Importance of tubule density to the fracture toughness of dentin(PERGAMON-ELSEVIER SCIENCE LTD, 2016-07-01) Montoya, C.; Arola, D.; Ossa, E.A.; Montoya, C.; Arola, D.; Ossa, E.A.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de IngenieríaObjective: The fracture toughness of dentin is critical to the prevention of tooth fracture. Within the tooth crown, the mechanical properties of dentin are influenced by spatial variations in the density and diameter of the dentin tubules with distance from the pulp. There are also relevant changes to the microstructure of dentin with age. In this investigation the importance of tubule density to the fracture toughness of dentin was evaluated in ``young'' and ``old'' age groups. Methods: The variations in microstructure (density and diameter of tubules) from young and old donor teeth were studied by means of optical microscopy. Results: A reduction in the density and diameter of tubules was identified to occur with aging. An approach previously proposed to study the mechanical behavior of porous materials was used to model the fracture toughness of coronal dentin in terms of the tubule characteristics. Results were then compared with published results from previous studies. Conclusions: The model predictions were consistent with experimental results for the fracture toughness of dentin from young donor teeth, but overestimated the values that have been reported for ``old'' dentin. (C) 2016 Elsevier Ltd. All rights reserved.