al-Ajam A D, McGregor A J
Oral and Maxillofacial Department, Scunthorpe General Hospital, South Humberside, United Kingdom.
J Endod. 1993 Jul;19(7):353-6. doi: 10.1016/S0099-2399(06)81362-2.
Apical microleakage following reverse retrograde root filling with extra high copper amalgam alloy was compared with that following a silver-glass ionomer retrofilling. The root canals of 56 extracted, single-rooted anterior human teeth were instrumented and obturated with laterally condensed gutta-percha and zinc oxide-eugenol sealer. Each tooth was apically resected at 45 degrees to its long axis and the root surface isolated with nail varnish. Teeth were divided into three groups. The first group received extra high copper amalgam retrograde fillings, the second group was retrofilled with a silver-glass ionomer, and the control group had no retrograde root filling placed. Following immersion in 1% methylene blue dye at 37 degrees C, the roots were sectioned and dye penetration was measured using an image analyzer. The sealing effectiveness of these materials was determined by their ability to inhibit dye penetration at 24 and 48 h. The results of this study show that a silver glass-ionomer is just as effective as extra high copper amalgam in terms of sealing capability. There was no statistically significant difference between the two materials.
将用超高铜汞合金进行逆向根管充填后的根尖微渗漏情况与用银玻璃离子水门汀进行逆向充填后的情况作比较。对56颗拔除的单根人前牙的根管进行预备，并用侧向加压热牙胶和氧化锌丁香酚封闭剂进行充填。每颗牙齿均在与长轴呈45度角处进行根尖切除术，并用指甲油隔离牙根表面。牙齿被分为三组。第一组进行超高铜汞合金逆向充填，第二组用银玻璃离子水门汀进行逆向充填，对照组不进行逆向根管充填。在37℃下浸入1%亚甲蓝染料后，将牙根切片，并用图像分析仪测量染料渗透情况。通过这些材料在24小时和48小时时抑制染料渗透的能力来确定其封闭效果。本研究结果表明，就封闭能力而言，银玻璃离子水门汀与超高铜汞合金一样有效。两种材料之间没有统计学上的显著差异。
