关键词: 电偶电流, 电偶腐蚀

Abstract: Objective To measure the magnitude of galvanic currents produced by different occluding metallic contact. Methods The circuits of instantly different metallic contact were simulated in artificial saliva,and electrical potential of every couple and 15 currents of instant contact were measured. To simulate night sleep, after 8 h soaking, 15 currents were obtained in addition. Results During early soaking, gold/Co-Cr alloy produced the highest current (6.17 μA),while there were significant differences in currents between gold/zinc-free amalgam，gold /zinc-containing amalgam and other couples (P<0.05) after 8 h soaking. In comparison between currents produced by couples before and after 8 h soaking, the currents produced by Co-Cr alloy/ zinc-free amalgam proved to be no significant difference (P>0.05)，and the current value was low all the time. Potential of zinc-containing amalgam was more negative than other alloys,and it was always under anodic behavior during the experiment and was corrupted acceleratedly. Conclusion Couples of gold/titatium,gold/zinc-containing amalgam,zinc-free/zinc-containing amalgam appearing in oral will do harm to the patients′health,while Co-Cr/zinc-free amalgam can coexist in oral . Corrosion behavior of amalgam is affected by different contents of zinc. dental alloys；galvanic corrosion；galvanic current

Key words: galvanic corrosion, galvanic current