Asgary Saeed, Eghbal Mohammad Jafar, Parirokh Masoud
Department of Endodontics, Iranian Center for Endodontic Research, Dental School, Shaheed Beheshti Medical University, Tehran, Iran.
J Biomed Mater Res A. 2008 Dec 1;87(3):706-9. doi: 10.1002/jbm.a.31678.
This study investigated the potential usage of novel endodontic cement (NEC) as a root-end filling material by comparing its sealing ability with that of mineral trioxide aggregate (MTA) and intermediate restorative material (IRM). Sixty-six single rooted extracted human teeth were cleaned, shaped, and obturated in a similar method. After root-end resection, 3-mm deep root-end cavities were ultrasonically prepared. The samples were divided randomly into 3 test groups, having 20 roots each. Six roots were used as positive and negative controls. Samples were filled with test materials and after one day were immersed in methylene blue dye for 24 h. Roots were sectioned longitudinally and examined under stereomicroscope. Positive and negative controls responded as expected. The increasing order of mean dye microleakage values was NEC < MTA < IRM. ANOVA test showed statistically significant differences among experimental groups (p < 0.001). Tukey's test revealed no significant difference between NEC and MTA. It was concluded that the sealing ability of NEC and MTA is the same and superior to IRM.
本研究通过比较新型牙髓水泥（NEC）与三氧化矿物凝聚体（MTA）和中间修复材料（IRM）的封闭能力，探讨了新型牙髓水泥作为根尖充填材料的潜在用途。66颗单根拔除的人牙以类似方法进行清洁、预备和充填。在根尖切除后，超声制备3毫米深的根尖窝洞。样本随机分为3个试验组，每组20个牙根。6个牙根用作阳性和阴性对照。样本用试验材料充填，一天后浸入亚甲蓝染料中24小时。将牙根纵向切开并在体视显微镜下检查。阳性和阴性对照的反应符合预期。平均染料微渗漏值的递增顺序为NEC < MTA < IRM。方差分析显示试验组之间存在统计学显著差异（p < 0.001）。Tukey检验显示NEC和MTA之间无显著差异。得出的结论是，NEC和MTA的封闭能力相同且优于IRM。
