Aledrissy Hager Ibn Idriss, Abubakr Neamat Hassan, Ahmed Yahia Nadia, Eltayib Ibrahim Yahia
Department of Conservative Dentistry, Dental School, EL Neelan University of Medical Sciences, Khartoum, Sudan.
Iran Endod J. 2011 Fall;6(4):155-9. Epub 2011 Nov 15.
The purpose of this in vitro study was to evaluate the sealing ability of the readymade temporary filling and hand mixed materials by assessing coronal microleakage.
Standardized access cavities were prepared in 80 intact human permanent premolar teeth. They were divided randomly into four experimental groups (n=20). The teeth were restored using one of the temporary materials including Cavisol, Litrak, Zinc phosphate cement, Zinconol (IRM). Thermocycling was applied on the specimens. Methylene blue dye was applied and penetration was evaluated under stereomicroscope. Grading of the microleakage pattern was from 1 to 3, with 3 providing the best seal. Results were analyzed using one-way ANOVA test (P<0.05).
Microleakage of Cavisol and Litrak samples achieved grade 3; whereas zinc phosphate cement and Zinconol samples absorbed the dye into the bulk of the materials. Cavisol was found to exhibit the best seal amongst the four tested materials followed by Litrak, zinc phosphate cement, and Zinconol. There was a statistically significant difference in the microleakage scores obtained between the materials (P<0.01).
Among the four materials tested, readymade temporary filling provided the best sealing ability over hand-mixed. This study emphasizes the importance of correct placement and sufficient thickness of temporary filling materials in endodontic access cavities to ensure a tight seal.
本体外研究的目的是通过评估冠部微渗漏来评价预成临时充填材料和手工调配材料的封闭能力。
在80颗完整的人类恒牙前磨牙上制备标准化的开髓洞型。将它们随机分为四个实验组（n = 20）。使用其中一种临时材料（包括Cavisol、Litrak、磷酸锌水门汀、Zinconol（IRM））对牙齿进行修复。对标本进行热循环处理。应用亚甲蓝染料，并在体视显微镜下评估染料渗透情况。微渗漏模式的分级为1至3级，3级表示封闭效果最佳。使用单因素方差分析检验（P<0.05）对结果进行分析。
Cavisol和Litrak样本的微渗漏达到3级；而磷酸锌水门汀和Zinconol样本则将染料吸收到材料内部。在四种测试材料中，发现Cavisol的封闭效果最佳，其次是Litrak、磷酸锌水门汀和Zinconol。材料之间获得的微渗漏分数存在统计学显著差异（P<0.01）。
在四种测试材料中，预成临时充填材料比手工调配材料具有更好的封闭能力。本研究强调了在根管治疗开髓洞中正确放置临时充填材料并保证足够厚度以确保紧密封闭的重要性。
