Abstract:

Objective    To examine the apical sealing ability of iRoot FS through micro-CT and 3D reconstruction software Mimics，as well as the dye leakage study. Methods    A total of 34 extracted permanent teeth were retrofilled by iRoot FS，MTA，then scanned by micro-CT，3D models were reconstructed by software Mimics. The volume between the mater and the root was calculated. Then the teeth were placed in India ink for the day leakage study，Robertson's technology was used to make specimens transparent. The apical leakage was measured under the microscope. Results    Micro-CT scanning found that there was no significant difference in voids between iRoot FS group and MTA group（P＞0.05）. There was no significant difference in microleakage between iRoot FS group and MTA group（P＞0.05）. Conclusion    　    iRoot FS has similar apical sealing ability to MTA and might be considered as a promising root-end filling material.

Key words: iRoot FS, MTA, Micro-CT, dye leakage study, apical sealing ability

摘要：

目的    利用Micro-CT三维重建和印度墨水渗入法配合透明牙技术，对iRoot FS的根尖封闭性进行研究。方法    收集清远市人民医院口腔科2015年1—12月期间因外伤、牙周炎或正畸原因拔除的成人单根上颌前牙34颗，根管充填后制备根尖洞形，分别用iRoot FS、矿物三氧化物凝聚体（MTA）进行倒充填，每组15颗牙齿，阳性对照组和阴性对照组各2颗。通过Micro-CT对样品进行扫描，使用Mimics医学影像分析软件对根尖段进行三维重建，计算倒充填材料与根管壁之间的空隙体积。利用印度墨水对上述样本进行浸泡染色，再将样本进行透明处理，显微镜下测量染料渗漏深度。结果    iRoot FS组与MTA组空隙体积之间差异无统计学意义（P＞0.05）。iRoot FS组与MTA组渗漏深度差异无统计学意义（P＞0.05）。结论    iRoot FS与MTA的根尖封闭性相当，适用于临床根尖倒充填。倒充填材料与根管壁之间间隙体积与染料渗漏深度结果具有一致性，均匀分布的间隙模型与染料分布不均匀具有不一致性。

关键词:  , iRoot FS, 矿物三氧化物凝聚体, Micro-CT, 染料渗入法, 根尖封闭性