Photoacustic study of human teeth submitted to radiotherapy
DOI:
https://doi.org/10.22456/2177-0018.116976Keywords:
Dental enamel, Thermal diffusion, RadiotherapyAbstract
Aim: This research aimed to characterize, by the technique of Photoacoustic Absorption Spectroscopy, the effect of X-radiation on mineralized human dental tissues, irradiated with doses used for the treatment of patients with head and neck cancer. Materials and methods: Radiation was introduced by a linear accelerator in humans teeth longitudinally sectioned, where the central portion was investigated in three regions: enamel, coronary dentin and cervical dentin, before and after irradiation. 20 teeth where analyzed, where a group formed by 10 teeth was irradiated with a total dose of 70 Gy, divided into daily doses of 2 Gy, while another group, also with 10 teeth, was irradiated with a single dose of 70 Gy. Results: After irradiation, a significant reduction in thermal diffusivity of 47 and 40% in enamel, 43 and 37% in coronary dentin and 60 and 48% in cervical dentin was observed for radiation in fractional and single doses, respectively. Discussion: The measures, obtained before the radiation, of thermal diffusivity on the analyzed regions, showed that the values found in this work are in agreement with the literature, while the strong fall in the thermal diffusivity showed that a degradation in the dental structure happened. In addition, the application of X radiation caused significant damage to the tooth that could promote the formation and propagation of radiation caries. Conclusion: The reduction in thermal diffusivity observed slows down both heat dissipation and the speed at which it reaches the internal regions of the tooth, leading to a delay in the sensation of pain, which may result in excessive energy usage during dental procedures.
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