INVESTIGATION OF THERMODYNAMIC MODELS AND HEAT TRANSFER DURING LASER RADIATION IN TEETH TISSUE
Main Article Content
Keywords
human tooth, laser radiation, finite volume method, heat transfer, thermodynamics, Fourier, non-Fourier
Abstract
In this study, the thermal behavior of human teeth under laser irradiation is investigated. Due to the high power and short duration of laser exposure, deviations from the Fourier heat transfer model can occur. To address this limitation, the Dual-Phase-Lag (DPL) non-Fourier heat transfer model is employed. The study focuses on a two-rooted wisdom tooth, where the DPL model equations are solved using the finite volume method to obtain the thermal response of the tooth under laser exposure. The effects of the phase lags, which are parameters of the DPL model and cause deviations from the Fourier model, are thoroughly analyzed in relation to the thermal behavior of the tooth. The results indicate that the non-Fourier model can produce a significantly different temperature distribution compared to the Fourier model. The extent of this deviation is determined by the two phase lags in the DPL model. To determine the optimal phase lags, inverse heat transfer methods were utilized. By applying the Levenberg-Marquardt method and utilizing experimental data from previous studies, the optimal phase lags were identified, demonstrating that the non-Fourier model is more suitable for simulating laser irradiation on teeth compared to the Fourier model. For instance, in the case of laser irradiation delivering 28,000 joules per square meter over 5 seconds, the Fourier model predicts a maximum temperature difference of approximately 40°C, whereas experimental results report a difference of around 22°C. Assuming the tooth behaves as a non-Fourier material with parameters ????ₜ = 3 and ????ₚ = 3, the calculated temperature difference is approximately 25°C, which closely aligns with the experimental findings.
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Bita Aramesh
Specialist in surgery and root canal treatment (Endodontist), University of Sistan and Baluchistan, Zahedan, Iran
