Department of Stomatology, Affiliated Hospital of Jining Medical University, Jining, China; Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada.
Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada.
J Endod. 2021 Nov;47(11):1783-1789. doi: 10.1016/j.joen.2021.08.015. Epub 2021 Sep 4.
The present study evaluated the percentage volume of voids in root canals of mandibular molars that had been obturated for 54 months.
Thirty extracted human mandibular molars were instrumented and debrided. The teeth were assigned to 3 groups (n = 10) according to the filling technique and sealer used: the single-cone technique using AH Plus sealer (AHS; Dentsply Sirona Endodontics, Tulsa, OK) or EndoSequence BC sealer (BCS; Brasseler USA Dental LLC, Savannah, GA) and the warm vertical compaction technique using AH Plus sealer (AHW). The specimens were stored at 37°C and 100% humidity. Micro-computed tomographic imaging was used to scan each specimen 1 day 54 months after obturation. Data were analyzed using 1-way analysis of variance and the paired t test.
The percentage volume of voids in the teeth 1 day after obturation in the AHS group was higher than in the BCS group and the AHW group (P < .05). After 54 months, the proportion of voids decreased in all groups (P < .05). No significant difference was observed between the AHS group and the BCS group after 54 months. Teeth in the AHW group contained fewer voids than the AHS group (P < .05).
Voids in root canal filling were reduced 54 months after obturation. The warm vertical compaction technique achieved better root canal filling quality in mandibular molars than the single-cone technique when using AHS after long-term storage at 100% humidity.
本研究评估了 54 个月后进行根管充填的下颌磨牙根管内的空隙百分比体积。
对 30 个人工下颌磨牙进行器械和清创处理。根据使用的充填技术和密封剂，将牙齿分为 3 组（n=10）：使用 AH Plus 密封剂的单尖技术（AHS；登士柏西诺德公司，塔尔萨，俄克拉荷马州）或 EndoSequence BC 密封剂（BCS； Brasseler USA Dental LLC，萨凡纳，佐治亚州）和使用 AH Plus 密封剂的热垂直加压技术（AHW）。将标本储存在 37°C 和 100%湿度下。在根管充填后第 54 天，使用微计算机断层扫描对每个标本进行扫描。使用单因素方差分析和配对 t 检验对数据进行分析。
AHS 组在根管充填后第 1 天的空隙百分比体积高于 BCS 组和 AHW 组（P<.05）。54 个月后，所有组的空隙比例均降低（P<.05）。54 个月后，AHS 组和 BCS 组之间没有观察到显著差异。与 AHS 组相比，AHW 组的牙齿空隙更少（P<.05）。
根管充填后 54 个月，根管内的空隙减少。在 100%湿度下长期储存后，与使用单尖技术相比，热垂直加压技术在使用 AHS 时，在下颌磨牙中获得了更好的根管充填质量。
