Ozata F, Erdilek N, Tezel H
Department of Endodontics, Ege Universitesi, Izmir, Turkey.
Int Endod J. 1993 Jul;26(4):241-5. doi: 10.1111/j.1365-2591.1993.tb00565.x.
The purpose of this study was to compare the sealing ability of high-copper amalgam, glass ionomer cement, and silver glass ionomer cement as retrofilling materials when used with and without varnish. Seventy extracted human single-rooted anterior teeth were instrumented and the root canals obturated with laterally condensed gutta-percha and sealer. The apical 3 mm of each root was resected and a 2 mm-deep apical Class I preparation cut. The roots were then randomly allocated to six groups of 10 teeth and retrofilled with one of the experiment materials. Group I comprised high-copper amalgam; group 2, high-copper amalgam with cavity varnish; group 3, glass ionomer cement without varnish; group 4, glass ionomer cement with varnish; group 5, silver glass ionomer cement without varnish; and group 6, silver glass ionomer cement with varnish. Two groups of five roots each were used as positive and negative controls. The root surfaces were coated with nail polish and specimens immersed in 2% methylene blue solution for 14 days. After vertical sectioning, dye penetration was examined under a stereomicroscope. The results of the study were analysed statistically. The sealing ability of the conventional glass ionomer cement with varnish was significantly better while dye penetration was higher in silver glass ionomer cement without varnish group than the other groups (P < 0.01).
本研究的目的是比较高铜汞合金、玻璃离子水门汀和银玻璃离子水门汀作为倒充填材料在使用和不使用清漆时的封闭能力。选取70颗拔除的人单根前牙进行根管预备，并用侧向加压热牙胶和封闭剂充填根管。切除每颗牙根根尖3mm处，并制备一个2mm深的根尖I类洞。然后将牙根随机分为6组，每组10颗牙，用一种实验材料进行倒充填。第1组为高铜汞合金；第2组为涂有窝洞清漆的高铜汞合金；第3组为未涂清漆的玻璃离子水门汀；第4组为涂有清漆的玻璃离子水门汀；第5组为未涂清漆的银玻璃离子水门汀；第6组为涂有清漆的银玻璃离子水门汀。两组，每组5颗牙根，分别用作阳性和阴性对照。牙根表面涂指甲油，标本浸入2%亚甲蓝溶液中14天。垂直切片后，在体视显微镜下检查染料渗透情况。对研究结果进行统计学分析。涂有清漆的传统玻璃离子水门汀的封闭能力明显更好，而未涂清漆的银玻璃离子水门汀组的染料渗透高于其他组（P<0.01）。
