Zafar Morvarid, Iravani Maryam, Eghbal Mohammad Jafar, Asgary Saeed
Research Assistant, Dental Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Iran Endod J. 2009 Winter;4(1):15-9. Epub 2009 Jan 7.
This in vitro study aims to evaluate the coronal and apical sealing ability of gutta-percha (GP) root filling used with either mineral trioxide aggregate (MTA), new endodontic cement (NEC) or AH26 as filler/sealers.
Forty eight single-rooted extracted teeth were selected, decoronated and then instrumented. Samples were randomly divided into three experimental (n=12) and two control groups (n=6). In group 1, root canals were filled using lateral condensation technique (L); while single cone technique (S) was used for groups 2 and 3. AH26, MTA and NEC were the root canal sealer/fillers in groups 1, 2 and 3, respectively. Samples were immersed in 1% methylene-blue dye and then independently centrifuged apically and coronally. The roots were split longitudinally and linear extent of dye penetration was measured with a stereomicroscope from apical and coronal directions. Data were analyzed using One-way ANOVA and T-test.
No statistical differences in mean apical dye penetration between groups LGP/AH26, SGP/MTA and SGP/NEC were found; SGP/NEC group showed significantly less coronal dye penetration (P<0.001).
Considering the limitations of this in vitro study, it was concluded that the simple single cone technique with NEC can provide favorable coronal and apical seal.
本体外研究旨在评估使用三氧化矿物凝聚体（MTA）、新型牙髓黏固剂（NEC）或AH26作为填充剂/封闭剂时，牙胶尖（GP）根管充填的冠部和根尖封闭能力。
选取48颗单根离体牙，去除冠部后进行根管预备。样本随机分为三个试验组（n = 12）和两个对照组（n = 6）。第1组采用侧方加压技术（L）进行根管充填；第2组和第3组采用单锥技术（S）。AH26、MTA和NEC分别为第1、2和3组的根管封闭剂/填充剂。将样本浸入1%亚甲蓝染料中，然后分别进行根尖向和冠向离心。将牙根纵向劈开，用体视显微镜从根尖和冠部方向测量染料渗透的线性范围。数据采用单因素方差分析和t检验进行分析。
LGP/AH26组、SGP/MTA组和SGP/NEC组之间根尖染料渗透平均值无统计学差异；SGP/NEC组的冠部染料渗透明显较少（P < 0.001）。
考虑到本体外研究的局限性，得出结论：使用NEC的简单单锥技术可提供良好的冠部和根尖封闭。
