Wu Tian-Tian, Han Yan-Yan, Wang Yi
Department of General Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology. Shanghai 200011, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2024 Jun;33(3):225-228.
To establish molar root canal model with micro-computed tomography (Micro-CT) and evaluate the removal efficiency of calcium hydroxide by different methods.
Eight molar teeth (24 root canals) extracted from the Department of General Dentistry, Shanghai Ninth People's Hospital from October 2023 to February 2024 were collected. Root canal preparation was instrumented by M3 according to standard root canal treatment procedures, then calcium hydroxide was injected into the root canal. One week later, the samples were randomly divided into 3 groups according to different irrigation methods(n=8): lateral opening syringe group, ultrasonic group and sonic vibration group. Micro-CT was used to reconstruct the root canal system before and after irrigation, and independent root canals were marked with different colors. The root canals were divided into upper root segment, middle root segment and apex segment. The volume of calcium hydroxide in each canal was calculated, and the clearance rate of calcium hydroxide was compared among the groups. SPSS 19.0 software package was used for statistical analysis.
None of the three methods could completely remove calcium hydroxide from the root canal. When sodium hypochlorite was used as the flushing solution, the removal effect of ultrasonic group and sonic vibration group was significantly better than that of lateral opening syringe group(P＜0.05). The removal efficiency of calcium hydroxide by ultrasonic group and sonic vibration group was similar, and the difference was not statistically significant(P＞0.05). The removal rate of calcium hydroxide in apical segment was low.
Micro-CT can reconstruct the molar root canal model efficiently for evaluating the removal effect of calcium hydroxide. The removal efficiency of calcium hydroxide in ultrasonic group and sonic vibration group is similar, and both are better than that in lateral syringe group.
利用显微计算机断层扫描（Micro-CT）建立磨牙根管模型，并评估不同方法对氢氧化钙的清除效率。
收集2023年10月至2024年2月上海第九人民医院口腔综合科拔除的8颗磨牙（24个根管）。按照标准根管治疗程序用M3器械进行根管预备，然后向根管内注入氢氧化钙。1周后，根据不同冲洗方法将样本随机分为3组（n=8）：侧方开口注射器组、超声组和声波振动组。使用Micro-CT重建冲洗前后的根管系统，并用不同颜色标记独立的根管。将根管分为根上段、根中段和根尖段。计算各根管内氢氧化钙的体积，比较各组氢氧化钙的清除率。采用SPSS 19.0软件包进行统计分析。
三种方法均不能完全清除根管内的氢氧化钙。当使用次氯酸钠作为冲洗液时，超声组和声波振动组的清除效果明显优于侧方开口注射器组（P＜0.05）。超声组和声波振动组对氢氧化钙的清除效率相似，差异无统计学意义（P＞0.05）。根尖段氢氧化钙的清除率较低。
Micro-CT能够高效重建磨牙根管模型以评估氢氧化钙的清除效果。超声组和声波振动组对氢氧化钙的清除效率相似，且均优于侧方注射器组。
