Margelos J, Eliades G, Palaghias G
Research Center for Biomaterials, Athens, Greece.
J Endod. 1991 Jun;17(6):282-7. doi: 10.1016/S0099-2399(06)81868-6.
The purpose of this study was to examine the electrochemical behavior of silver points in vivo. The apices of silver points removed from teeth with successful or failed endodontic treatments were subjected to complete surface characterization by small-area ESCA, scanning electron microscopy, and electron probe microanalyzer. Cross-sections of the points near the apex were examined with scanning electron microscopy and electron probe microanalyzer to identify the depth of corrosion involvement. According to the results, all silver points manifested evidence of corrosion attack. Electron probe microanalyzer showed no difference in the elemental distribution found on the points. ESCA analysis of the uppermost 5-nm point layer revealed the presence of N on silver points removed from failed treatments. The examination of cross-sections manifested deep S penetration in the bulk of the points removed from failed treatments. Considering the results of this study, no direct association seems to exist between the extent of the corrosion involvement and the prognosis of the treatment. Handling factors and the presence of bacteria are probably the parameters determining the outcome of a treatment.
本研究的目的是检测银尖在体内的电化学行为。从根管治疗成功或失败的牙齿上取下的银尖根尖，通过小面积电子能谱分析（ESCA）、扫描电子显微镜和电子探针微分析仪进行全面的表面表征。用扫描电子显微镜和电子探针微分析仪检查根尖附近银尖的横截面，以确定腐蚀累及的深度。根据结果，所有银尖均显示出腐蚀侵蚀的迹象。电子探针微分析仪显示，银尖上的元素分布没有差异。对最上层5纳米银尖层的ESCA分析表明，从治疗失败的牙齿上取下的银尖上存在氮。对横截面的检查表明，从治疗失败的牙齿上取下的银尖主体中有硫的深度渗透。考虑到本研究的结果，腐蚀累及程度与治疗预后之间似乎没有直接关联。操作因素和细菌的存在可能是决定治疗结果的参数。
