Galhotra Virat, Sofat Anjali, Pandit Inder K, Gambhir Ramandeep Singh, Srivastava Nikhil, Gugnani Neeraj
Department of Pedodontics and Preventive Dentistry, Gian Sagar Dental College and Hospital, Rajpura, Punjab, India.
J Nat Sci Biol Med. 2013 Jul;4(2):403-8. doi: 10.4103/0976-9668.117014.
The present study is envisaged to evaluate and compare the microleakage of mineral trioxide aggregate (MTA) with commonly used retrograde filling materials, like light-cured composite with dentin-bonding agents, light-cured glass ionomer cement (LC GIC) and resin-modified zinc oxide eugenol.
Ninety freshly extracted non-carious single-rooted human anterior teeth were used in the study. They were randomly divided into four experimental groups and two control groups of 15 each. Following the biomechanical preparation, all teeth were obturated and then the apices of the obturated teeth were resected by removing 3 mm of each apex at 90° to the long axis of the tooth with a straight fissure bur in a high-speed air-rotor handpiece with water coolant. A 3-mm-deep root end cavity was prepared and the root end fillings were placed as per the manufacturer's instructions and according to the groups divided. The samples were then immersed in 1% methylene blue at room temperature for 72 h, 96 h and 1 week and the dye penetration was measured.
All the four materials used in the study showed some microleakage throughout the experimental period. The sealing ability in terms of microleakage can be summarized as: MTA > Composite resin with dentin bonding agent > LC GIC > Resin modified zinc oxide eugenol.
本研究旨在评估并比较三氧化矿物凝聚体（MTA）与常用的根尖倒充填材料，如含牙本质黏结剂的光固化复合树脂、光固化玻璃离子水门汀（LC GIC）和树脂改性氧化锌丁香酚的微渗漏情况。
本研究使用了90颗新拔除的无龋单根人前牙。将它们随机分为四个实验组和两个对照组，每组各15颗。在进行生物力学预备后，所有牙齿均进行充填，然后使用高速气涡轮手机上的直裂钻，在有水冷却的情况下，以与牙齿长轴呈90°角的方向切除每个充填牙齿根尖3mm的根尖部分。制备一个3mm深的根尖腔，并按照制造商的说明和分组情况进行根尖充填。然后将样本在室温下浸入1%的亚甲蓝溶液中72小时、96小时和1周，并测量染料渗透情况。
本研究中使用的所有四种材料在整个实验期间均表现出一定程度的微渗漏。就微渗漏而言，封闭能力可总结为：MTA＞含牙本质黏结剂的复合树脂＞LC GIC＞树脂改性氧化锌丁香酚。
