Resumo

PEDRAZIN, Maria Cristina et al. Evaluation of the laboratorial processes' quality applied to titanium prostheses: plasma casting and laser welding - metallographic analysis. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.2, pp. 221-226. ISSN 1981-8637.

Objective The aim of this study was to evaluate the quality of laboratory processes in titanium alloys. Methods Eight bars were cast using the voltaic arch technique. Three bars after casting were cut at three points and received, in total, nine laser welding points. All samples were analyzed under naked eye; 50X; 100X and 200X lens with electronic microscopy. Results All samples showed a perfect casting, without continuity solution or defects such as emptiness, bubbles, cracks, porosity or inclusions. The nine welding points didn't present any union failures, cracks or empty spaces and comparing this result with previous studies, there was improvement in the processes' quality. Conclusion The good quality observed in these laboratorial processes were due to the improvement of the technician's learning curve, observation of the laboratorial protocols, the correction of possible defects in the equipment used and the application of statistical process control (SPC).

Palavras-chave : Dental casting technique.; Dental soldering.; Titanium..