A ação galvânica entre o ouro e três tipos de amálgamas foi utilizada como recurso para se ressaltar a influência do polimento nos amálgamas, precedido ou não da brunidura, na produção de corrente elétrica in vitro e na evolução da corrosão in vivo. Ambos os testes demonstraram que a brunidura seguida de polimento reduz os níveis decorrente elétrica e corrosão dos amálgamas, sendo as ligas de maior contéudo de cobre as mais sensíveis a este tipo de acabamento.

The galvanic action between gold alloy and three dental amalgams was utilized as a resource to enhance the corrosion of burnished and polished amalgam sulface. This experiment was initially perfomed in vitro, through immersion of galvanic couples (gold X amalgam) in 1% NcCl solution with 7 eletric current measurements done each 24 h, totaling 96 hours observation periods. Furthermore, this experiment was duplicated in vivo through temporary cementation of galvanic couples in complete dentures of patients. The evolution of amalgam corrosion was recorded with photomicrographies and scored over a six-month period. Both tests, in vitro and in vivo, showed that burnishing followed by polishing effectively reduced the galvanic current and amalgam corrosion, with best results presented by Sybralloy, followed by Dispersalloy and by New True Dentalloy.