Thermal analysis of the dentine tubule under hot and cold stimuli using fluid-structure interaction simulation

作     者：Gholampour, Seifollah Jalali, Amin 

作者机构：Islamic Azad Univ North Tehran Branch Dept Biomed Engn POB *** Tehran Iran 

出 版 物：《BIOMECHANICS AND MODELING IN MECHANOBIOLOGY》 (生物力学和机械生物学模式)

年 卷 期：2018年第17卷第6期

页      面：1599-1610页

核心收录：

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 0710[理学-生物学] 071011[理学-生物物理学] 07[理学] 

主　　题：Hydrodynamic theory Odontoblastic transduction theory Intensity of thermal stress Fluid-structure interaction Scanning electron microscopy 

摘      要：The objective of this study is to compare the thermal stress changes in the tooth microstructures and the hydrodynamic changes of the dental fluid under hot and cold stimuli. The dimension of the microstructures of eleven cats teeth was measured by scanning electron microscopy, and the changes in thermal stress during cold and hot stimulation were calculated by 3D fluid-structure interaction modeling. Evaluation of results, following data validation, indicated that the maximum velocities in cold and hot stimuli were -410.2 +/- 17.6 and +205.1 +/- 8.7 mu m/s, respectively. The corresponding data for maximum thermal stress were -20.27 +/- 0.79 and +10.13 +/- 0.24cmHg, respectively. The thermal stress caused by cold stimulus could influence almost 2.9 times faster than that caused by hot stimulus, and the durability of the thermal stress caused by hot stimulus was 71% greater than that by cold stimulus under similar conditions. The maximum stress was on the tip of the odontoblast, while the stress in lateral walls of the odontoblast and terminal fibril was very weak. There is hence a higher possibility of pain transmission with activation of stress-sensitive ion channels at the tip of the odontoblast. The maximum thermal stress resulted from the cold stimulus is double that produced by the hot stimulus. There is a higher possibility of pain transmission in the lateral walls of the odontoblast and terminal fibril by releasing mediators during the cold stimulation than the hot stimulation. These two reasons can be associated with a greater pain sensation due to intake of cold liquids.