Digital image assessment of metallic post morphological detection through trans-illumination of composite material

摘要

In this work a technique was proposed and evaluated for detection of metallic posts of parallel sides through a test body of Z100 dental resin. The technique presented involves the acquisition and the image processing by trans-illumination of the resin to detect the edges of the posts. LASER and LED systems in different colors were used as a source of irradiation for the image formation. The qualitative analysis of the results showed that just by using LED in the red and green colors it was possible to detect the edges of the posts. The results also showed that the use of LASER in this experiment was not successful mainly due to the LASER light optical interference phenomenon inside the resin, which resulted in low definition images. Lastly the discussion of the work was directed to the optical effects of absorption and scattering of light throughout the resin, light diffraction through the posts and interference of the coherent light evaluating the influence of each effect in the experiment.