Kim Jong Cheon, Moe Maung Maung Kyaw, Kim Sung Kyo
Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea.
Department of Conservative Dentistry, University of Dental Medicine, Mandalay, Myanmar.
Restor Dent Endod. 2020 Feb 12;45(2):e18. doi: 10.5395/rde.2020.45.e18. eCollection 2020 May.
The purpose of this study was to evaluate the void of root canal filling over time when a calcium silicate sealer was used in the single gutta-percha cone technique.
Twenty-four J-shaped simulated root canals and twenty-four palatal root canals from extracted human maxillary molars were instrumented with ProFile Ni-Ti rotary instruments up to size 35/0.06 or size 40/0.06, respectively. Half of the canals were filled with Endoseal MTA and the other half were with AH Plus Jet using the single gutta-percha cone technique. Immediately after and 4 weeks after the root canal filling, the samples were scanned using micro-computed tomography at a resolution of 12.8 μm. The scanned images were reconstructed using the NRecon software and the void percentages were calculated using the CTan software, and statistically analyzed by 1-way analysis of variance, paired test and Tukey test.
After 4 weeks, there were no significant changes in the void percentages at all levels in both material groups ( > 0.05), except at the apical level of the AH Plus Jet group ( < 0.05) in the simulated root canal showing more void percentage compared to other groups. Immediately after filling the extracted human root canals, the Endoseal MTA group showed significantly less void percentage compared to the AH Plus Jet group ( < 0.05).
Under the limitations of this study, the Endoseal MTA does not seem to reduce the voids over time.
本研究的目的是评估在单牙胶尖技术中使用硅酸钙封闭剂时，根管充填物随时间的空隙情况。
使用ProFile镍钛旋转器械分别对24个J形模拟根管和24个从拔除的人类上颌磨牙腭根制备至35/0.06或40/0.06号尺寸。一半根管使用Endoseal MTA充填，另一半使用AH Plus Jet，均采用单牙胶尖技术。根管充填后立即及4周后，以12.8μm的分辨率使用微型计算机断层扫描对样本进行扫描。使用NRecon软件重建扫描图像，并使用CTan软件计算空隙百分比，通过单因素方差分析、配对检验和Tukey检验进行统计学分析。
4周后，两个材料组在所有水平的空隙百分比均无显著变化（>0.05），除了模拟根管中AH Plus Jet组的根尖水平（<0.05），该组显示出比其他组更高的空隙百分比。在充填拔除的人类根管后立即观察，Endoseal MTA组的空隙百分比显著低于AH Plus Jet组（<0.05）。
在本研究的局限性下，Endoseal MTA似乎不会随时间减少空隙。
