title: ÐÐ¾Ð´ÐµÐ»Ñ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ Ð¼Ð¸ÐºÑÐ¾ÑÑÐµÑÐ¸Ð½ Ð¿Ð¾Ð¿ÐµÑÐµÑÐ½Ð¾Ð³Ð¾ ÑÐ´Ð²Ð¸Ð³Ð° Ð² Ð´ÐµÐ½ÑÐ¸Ð½Ðµ Ð·ÑÐ±Ð¾Ð² ÑÐµÐ»Ð¾Ð²ÐµÐºÐ° Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð´Ð°Ð½Ð½ÑÑ ÑÐ°Ð·Ð¾Ð²Ð¾-ÐºÐ¾Ð½ÑÑÐ°ÑÑÐ½Ð¾Ð¹ ÑÐ¾Ð¼Ð¾Ð³ÑÐ°ÑÐ¸Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: A model for the development of transverse shear microcracks in dentin of human teeth based on phase contrast tomography
Creators: name: ÐÑÐ´ÐºÐ¸Ð½Ð°, ÐÐ°Ð½Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: Ð´ÐµÐ½ÑÐ¸Ð½
Ð¼Ð¸ÐºÑÐ¾ÑÑÐµÑÐ¸Ð½Ñ
ÑÐ¸Ð½Ñ ÑÐ¾ÑÑÐ¾Ð½Ð½Ð¾Ðµ Ð¸Ð·Ð»ÑÑÐµÐ½Ð¸Ðµ
ÐºÐ°Ð½Ð°Ð»Ñ
ÑÐ°Ð·Ð¾Ð²ÑÐ¹ ÐºÐ¾Ð½ÑÑÐ°ÑÑ
Ð½Ð°Ð¿ÑÑÐ¶ÐµÐ½Ð¸Ðµ
dentin
microcracks
synchrotron radiation
tubules
phase contrast
stress

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description: The final qualifying paper is devoted to the study of human dentin teeth, namely: the formation and development of microcracks in it, which are formed in flat samples under the action of uniaxial compression. A literature review is presented in which the dentin microstructure is examined, previously obtained models of various variants of fracture mechanisms are demonstrated, experimental data on the detection of the connection between the propagation of microcracks and dentinal channels by scanning electron microscopy and computed tomography on a commercial source are shown.
Mechanical tests for uniaxial compression of dentin samples were carried out at the Ural Federal University named after the first President of Russia B. N. Yeltsin. For observation, the method of phase contrast tomography in synchrotron radiation was used. Using the Amira software, we processed the results of experiments conducted on a 3rd-generation synchrotron radiation source in Pohang (South Korea), which provides coherent radiation in a wide range of wavelengths.
It is established that under uniaxial compression, dominant and satellite mode II cracks propagate in dentine. 3D-visualization of the directions and locations of the dentinal tubules and cracks, carried out by micro-tomography, showed that the cracks propagate through the tubules.
Qualitative and quantitative models for the development of microcracks are proposed. It is shown that tensile stresses are formed on the surface of the dentinal tubules located at the tip of the inhibited dominant crack, which are sufficient for the formation of satellite cracks. The predicted directions for the opening of satellite cracks are consistent with experimental observations.