摘要
目的:测定异种合金咬合接触时产生的电流值。方法:在人工唾液中体外模拟异种合金瞬间咬合接触时的回路,浸泡初记录各偶对的电位及15个瞬间接触电流值。模拟人体夜间睡眠继续浸泡8 h后以同样方法又得到15个电流值。结果:初浸时,金合金/钴铬合金偶对产生的电流值最大,达6.17μA;而浸泡8 h后,金合金/含锌银汞、金合金/无锌银汞偶对与其他偶对的电流值间比较,差异有显著性(P<0.05);偶对浸泡8 h前后比较,钴铬合金/无锌银汞合金偶对的电流值差异无显著性(P>0.05),始终处于最低水平。含锌银汞合金的电位较负,而且实验中始终为阳极,被加速腐蚀。结论:金合金/钴铬合金、金合金/含锌银汞合金、金合金/无锌银汞合金均产生较高的电流值,若存在于口腔中,会有一定危险。钴铬合金/无锌银汞合金偶合时产生电流值小,临床上可酌情应用。银汞合金中锌的含量不同,影响着合金的耐腐蚀性能。
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/zinccontaining amalgam appearing in oral will do harm to the patientsthealth, while Co-Cr/zinc-free amalgam can coexist in oral . Corrosion behavior of amalgam is affected by different contents of zinc.
出处
《吉林大学学报（医学版）》
CAS
CSCD
北大核心
2006年第2期319-321,343,共4页
Journal of Jilin University：Medicine Edition
基金
吉林省计委重点科技项目资助课题(2004-987)
关键词
牙科合金
电偶电流
电偶腐蚀
dental alloys
galvanic corrosion
galvanic current
