非贵金属烤瓷冠修复后牙龈组织和血液中镍铬元素含量分析

Analysis on Content of Ni-Cr in Gingival and Blood of Hares after Wearing Non-Noble Porcelain-Fused-to-Metal Crown

目的 研究家兔前牙行非贵金属烤瓷冠修复后牙龈组织及血液中镍铬元素的含量 ,初步探讨产生牙龈灰线的原因。方法 选 38只成年家兔为实验对象 ,备其上下前牙 ,用德国Vita非贵金属烤瓷合金制作烤瓷冠 ,粘固。3个月及 6个月后用石墨炉原子吸收光谱法对实验区龈组织和血液进行镍铬元素含量分析。结果 非贵金属烤瓷冠修复后 6个月组的牙龈组织和血液中镍铬元素含量均比对照组及 3个月组高 (P <0 .0 5 )。 3个月组的牙龈组织和血液中镍铬元素含量与对照组相比无差异 (P >0 .0 5 )。结论 非贵金属烤瓷冠暴露于口腔环境中 ,并与牙龈组织及体液直接接触 ,其金属边缘很容易发生电化学腐蚀 ,造成金属离子游离于牙龈组织和血液中 ,一定时间后引起牙龈灰线。

Objective Purpose of the study was to investigate the content of Nickel(Ni) and Chromium(Cr) ion in gingival tissue and blood, and to discuss the reason of gray line in gingival after wearing non-noble Porcelain-Fused-to-Metal crown.Methods 38 rabbits were selected as experimental animals which were divided into three groups: control group, group 1(3 months) and group 2( 6 months ). The content of Ni and Cr ion in gingival tissue and blood was detected by atomic absorption spectrometer.Results The amount of Ni and Cr in group 2 was significantly higher than that in other groups (P<0.05). There was no difference between group 1 and control group (P>0.05).Conclusion The reason of gingival colouration might be the electrochemical corrosion. The metal ion was released in gingival tissue and blood.