Deformation behavior of human dentin in liquid nitrogen: A diametral compression test

Anisotropy of the mechanical properties of human dental enamel

“…The portion of organic phase in dentin is in 10 times more in comparison with enamel [21]. Indeed, collagen fibers play the dominant role in fracture resistance and plasticity of human dentin [22][23][24][25][26]. Besides, the plane that perpendicular to the dentin channels is easy for fracture in dentin, whereas the plane along to the enamel rods is preferential for fracture in dental enamel [20].…”

On some features of the shape effect in human dentin under compression

“…It is important to note that the diametral compression strength of dentin becomes higher in comparison with other model materials. This fact may be explained by the feature of fracture behavior of dentin, when the organic phase suppresses the crack growth [7,10]. The diametral compression testing of dentin in liquid nitrogen has shown that in this case its plasticity is caused by the organic phase, whereas the contribution of its porosity is negligible [7].…”

“…Detailed description of the dentin sample preparation is presented in refs. [1,2,7]. There were six groups with the different d/h ratios (10, 7, 4, 1.5, 0.8, 0.5) per 10 samples for each model material and eleven groups with the different d/h ratios (11, 10, 8.5, 7, 5.5, 4, 2.5, 1.5, 0.7, 0.5) with 10 pieces of human dentin for Materials Science and Engineering C 45 (2014) 205-209 compression ( Fig.…”

Statistical regularities of alumina fragmentation under uniaxial compression at room and liquid nitrogen temperatures

“…At liquid nitrogen temperature (77 K), compression strength and elastic deformation of dentin were higher than these parameters at room temperature and, vice versa, at liquid nitrogen temperature the plasticity of dentin was very small in comparison with room temperature [2]. This effect is explained by the contribution of bioorganic phase, including collagen fibers, into the plastic deformation of dentin at room temperature, which, however, diminishes at 77 K. Hence, the inorganic phase must play an important role in the mechanical behavior of dentin at low temperatures [2]. In this paper, the mechanical properties of human dentin are compared with an intrinsically brittle material having 10 % of porosity (plasma spraying alumina) under the same deformation conditions.…”

“…It has been shown that the mechanical properties of human dentin under uniaxial compression are sensitive to the experiment temperature [1][2][3]. At liquid nitrogen temperature (77 K), compression strength and elastic deformation of dentin were higher than these parameters at room temperature and, vice versa, at liquid nitrogen temperature the plasticity of dentin was very small in comparison with room temperature [2].…”