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首页> 外文期刊>Journal of dentistry >Measurement of thermophysical properties of human dentin: Effect of open porosity.
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Measurement of thermophysical properties of human dentin: Effect of open porosity.

机译：人类牙本质的热物理性质的测量：开孔的影响。

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摘要

In dentistry caries removal can be performed with rotatory instruments or high intensity laser. Both techniques can heat the tooth and harm the pulp. The literature review about the measurement of human dentin thermophysical properties revealed a great variation of the values obtained by several authors, and most of the studies are outdated. Most of these studies have not directly measured the thermal diffusivity of human dentin, and the reported values are calculated values based on measurements of conductivity, density and specific heat. OBJECTIVE: The aim of the present study was to measure human dentin thermal diffusivity, density, open porosity and specific heat, and then to calculate its thermal conductivity and analyze the influence of open porosity in these properties. METHOD: The methods used were: flash laser method for measuring thermal diffusivity, method of penetration and immersion with xylol for density and open porosity and differential scanning calorimetry for measuring specific heat. Calculated results of the thermal conductivity are shown as well. RESULT: Results of diffusivity, density, open porosity, specific heat and thermal conductivity of measurements performed on five samples are presented and compared with results of other authors. The open porosity of the samples varied between 1.11% and 3.08% of the sample volume, corresponding to densities ranging between 2090 and 2400kgm(-3), thermal diffusivity: 0.199 and 0.265x10(-6)m(2)s(-1), specific heat: 872.5 and 1181.0Jkg(-1)K(-1), thermal conductivity: 0.363 and 0.666Wm(-1)K(-1). CONCLUSION: It has been found that there exist a strong correlation between the open porosity of human dentin and its thermal conductivity and density. Both human dentin thermal conductivity and density decrease with the increasing of open porosity, with a confidence of at least 98% and 96.6%, respectively.
机译：在龋齿中，可以使用旋转器械或高强度激光进行去除。两种技术都会加热牙齿并伤害牙髓。关于人类牙本质热物理性质测量的文献综述显示，一些作者获得的值存在很大差异，并且大多数研究已过时。这些研究大多数都没有直接测量人牙本质的热扩散率，报告的值是基于电导率，密度和比热的测量值计算得出的。目的：本研究的目的是测量人牙本质的热扩散率，密度，开孔率和比热，然后计算其热导率并分析开孔率对这些特性的影响。方法：采用的方法有：闪光激光法测量热扩散率，二甲苯酚渗透和浸入法测量密度和开孔率以及差示扫描量热法测量比热。还显示了热导率的计算结果。结果：给出了五个样品的扩散率，密度，开孔率，比热和导热率的测量结果，并与其他作者的结果进行了比较。样品的开孔孔隙率在样品体积的1.11％至3.08％之间变化，对应的密度在2090至2400kgm（-3）之间，热扩散率：0.199和0.265x10（-6）m（2）s（-1） ），比热：872.5和1181.0Jkg（-1）K（-1），热导率：0.363和0.666Wm（-1）K（-1）。结论：发现人牙本质的开孔率与其导热系数和密度之间存在很强的相关性。人牙质的热导率和密度均随开孔率的增加而降低，其置信度分别为至少98％和96.6％。

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