Avaliação das propriedades ópticas dos ossos maxilares e mandibulares humanos

Abstract

The present study evaluated the interaction between the low level laser and the human maxillary and mandibular bones, regarding the effective transmission in the buccal-lingual application, scattering, attenuation and penetration depth for cervico-apical application. The evaluation of the effective transmission of the LLL through the maxilla and mandible alveolar bone was performed with a red and infrared lasers. The laser head was positioned on the bone wall opposite to the radiated wall for the measure of the remaining energy passing through the bone tissue. 10 measurements were performed with each laser irradiated at each point, the data were statistically tested. To evaluate the attenuation, scattering, and penetration deph of the laser, the same specimens were irradiated by a He-Ne laser positioned parallel to the bone surface, while a high-resolution camera captured the images of the light scattering. These images were processed with a graphic software. For buccal-lingual application, there was a higher transmission in the anterior region compared to the posterior one on both lasers and bones. The 780 nm laser demonstrated a greater transmission over all analyzed regions on both bones. In the cervico-apical application, a greater attenuation of light occurred on both the anterior maxilla and mandible. The differences on light behavior can be related to the anatomical and pathophysiological differences of bone and indicate that it may be needed to adjust the dosimetric parameters in order to obtain the best therapeutic results.