Ahangari Zohreh, Karami Mahdieh
Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Member of Shahid Kalantari Clinic, Tehran, Iran.
Iran Endod J. 2006 Summer;1(2):60-4. Epub 2006 Jul 1.
Perforations of the pulpal floor create problems during endodontic treatment and often results in secondary periodontal involvement with eventual loss of teeth. The purpose of this study was to evaluate the ability of mineral trioxide aggregate (MTA), Amalgam, zinc oxide and eugenol (ZOE) and Portland cement to seal furcal perforations in extracted human molars using dye penetration.
This Microleakage study was conducted on 70 human permanent mandibular molars with well developed, non-fused roots. Access openings and furcation perforations were prepared in the pulp chamber floor. Ten teeth were assigned as controls and divided into two groups of five teeth each as positive and negative control. The positive group were accessed and perforated similar to experimental groups but the negative controls were not prepared. The rest of the teeth were divided in four experimental groups of 15 teeth in each group. Experimental groups comprised groups Al to A4, group Al was repaired with MTA, group A2 with Amalgam, group A3 with Coltozol (ZOE) and group A4 was repaired with Portland cement. The teeth were submerged in solution of 2% fucshin dye for 24 hours. Finally, the samples were sectioned and evaluated for linear dye leakage at X25 magnification and analyzed statistically.
The results showed that MTA had significantly less leakage than Amalgam, Portland cement and Coltozol (P<0.05).
Maximum dye penetration was observed in Coltozol followed in decreasing order by Portland cement and Amalgam.
牙髓室底穿孔在根管治疗过程中会引发问题，并常常导致继发牙周病变，最终致使牙齿丧失。本研究的目的是使用染料渗透法评估三氧化矿物凝聚体（MTA）、银汞合金、氧化锌丁香酚（ZOE）和波特兰水泥封闭拔除的人类磨牙髓室底穿孔的能力。
本微渗漏研究在70颗具有发育良好、未融合牙根的人类恒牙下颌磨牙上进行。在髓室底制备进入开口和根分叉穿孔。将10颗牙齿指定为对照组，并分为两组，每组5颗牙齿，分别作为阳性和阴性对照。阳性组的制备方法与实验组相似，进行开髓和穿孔，但阴性对照组不做处理。其余牙齿分为四个实验组，每组15颗牙齿。实验组包括A1至A4组，A1组用MTA修复，A2组用银汞合金修复，A3组用Coltozol（ZOE）修复，A4组用波特兰水泥修复。将牙齿浸泡在2%品红染料溶液中24小时。最后，将样本切片，在25倍放大倍数下评估线性染料渗漏情况，并进行统计学分析。
结果表明，MTA的渗漏明显少于银汞合金、波特兰水泥和Coltozol（P<0.05）。
观察到Coltozol的染料渗透最大，其次是波特兰水泥和银汞合金，渗漏程度依次递减。
