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Photothermal Radiometry and Diffuse Reflectance Analysis of Thermally Treated Bones

“…Additionally, it has been shown that the thermal diffusivity of human enamel is higher than in bones, a result that should be expected taking into account that enamel is a ceramic-like HA material [34,35]. In contrast, in the case of human dentin, having a high porosity, lower values around 2.3 × 10 −3 cm 2 ·s −1 have been reported [34][35][36][37]. These results indicate that the microstructure and composition are key factors in thermal diffusion; however, the detailed process of heat transport in non-homogenous materials and its effect on the macroscopic thermal properties is a subject that continues to be developed [38].…”

In vitro thermal diffusivity measurements as aging process study in human tooth hard tissues

“…25 The literature review about human dentin thermal diffusivity measurement revealed a great variation of the values obtained by several authors. [3][4][5]7,26 Panas et al 7 and BorovskiK % et al 26 found for dentin thermal diffusivity the values 19:2 Â 10 À4 and 26:5 Â 10 À4 cm 2 s À1 , respectively, using the flash laser method. Magalhães et al 3 found for five dentin samples, whose ages ranged from 18 to 26 years, values between 19:9 Â 10 À4 and 26:5 Â 10 À4 cm 2 s À1 using the same methodology.…”

“…Panas et al 6 discussed the difficulties in identify the thermophysical properties of human tooth hard tissues and how some of the obtained results differ from the data presented in the literature, mainly about thermal diffusivity investigations. 3,7 According to them, the reasons for that are both difficulties in obtaining the adequate specimens and complicated structure of the investigated material, which makes the measurements more difficult. The differences could be related to personal differences of the hard tooth specimens.…”

Validation of the Thermal Diffusivity from Modified Monotonic Heating Regime Procedure

“…The 15 mm specimen was selected since it represents the biggest challenge-for this specimen the contribution of convection in the modeled heat transfer phenomena (see Eqs. (2) and (5)) is the largest. To define the governing equation, pure conduction with no internal heat sources inside the specimen was assumed.…”

“…Most important is its versatility in terms of the specimen size, shape, and 1 Paper presented at the Seventeenth European Conference on Thermophysical Properties, September 5-8, 2005, Bratislava, Slovak Republic. 2 Laboratory of Thermodynamics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland. 3 To whom correspondence should be addressed.…”