Examinando por Materia "Strength"
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Ítem Differences in the microstructure and fatigue properties of dentine between residents of North and South America.(PERGAMON-ELSEVIER SCIENCE LTD, 2014-10-01) Ivancik J; Naranjo M; Correa S; Ossa A; Tay FR; Pashley DH; Arola D; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)UNLABELLED: Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. OBJECTIVE: The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. METHODS: Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. RESULTS: There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (pÍtem Differences in the microstructure and fatigue properties of dentine between residents of North and South America.(PERGAMON-ELSEVIER SCIENCE LTD, 2014-10-01) Ivancik J; Naranjo M; Correa S; Ossa A; Tay FR; Pashley DH; Arola D; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)UNLABELLED: Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. OBJECTIVE: The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. METHODS: Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. RESULTS: There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (pÍtem Differences in the microstructure and fatigue properties of dentine between residents of North and South America.(PERGAMON-ELSEVIER SCIENCE LTD, 2014-10-01) Ivancik J; Naranjo M; Correa S; Ossa A; Tay FR; Pashley DH; Arola D; Ivancik J; Naranjo M; Correa S; Ossa A; Tay FR; Pashley DH; Arola D; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de IngenieríaUNLABELLED: Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. OBJECTIVE: The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. METHODS: Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. RESULTS: There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (p