基于真实牙齿的计算流体动力学分析：针工作长度和根管弯曲度对冲洗的影响。
Influence of needle working length and root canal curvature on irrigation: a computational fluid dynamics analysis based on a real tooth.
机构信息
Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, 310006, Hangzhou, People's Republic of China.
College of Mechanical and Electrical Engineering, China Jiliang University, 310006, Hangzhou, People's Republic of China.
出版信息
BMC Oral Health. 2022 May 14;22(1):179. doi: 10.1186/s12903-022-02205-2.
BACKGROUNDS
To compare the irrigation efficiency with different needle working length and different root canal curvature based on a real unshaped root canal using computational fluid dynamics (CFD) method.
METHODS
Images of the root canal of the maxillary first molar after being prepared to .04/15 were scanned using micro-CT, and then imported into the software for three-dimensional reconstruction. A palatal root canal with a curvature of 23.4° was selected as the experiment canal. The needle working length of the 30-G flat needle was 4.75 mm, 5 mm, 5.25 mm and 5.5 mm short of apical foramen respectively, the flow pattern, irrigation velocity, shear stress were compared. The modified curved canals with a curvature of 0°, 5°, 10°, 20° and 30°were reconstructed via software. The flat needle was replaced at the optical inserted depth, and key parameters of irrigation efficiency were analyzed.
RESULTS
Decreased needle working length had a positive impact on irrigation efficiency. With the optimal needle working length, the replacement of the apical irrigation fluid, the effective velocity, and wall shear stress were significantly improved in more severely curved root canals. With the same needle working depth and analogous canal curvature, irrigation efficiency is higher in real canal than that of modified canal.
CONCLUSIONS
Short needle working depth, large curvature and the anomalous inner wall of canals help to improve irrigation efficiency.
背景
基于真实未塑形根管，利用计算流体动力学（CFD）方法比较不同工作长度和不同根管弯曲度的冲洗效率。
方法
使用微 CT 对上颌第一磨牙预备至.04/15 的根管进行扫描，然后将其导入三维重建软件中。选择具有 23.4°弯曲度的腭侧根管作为实验根管。30-G 平针头的工作长度比根尖短 4.75mm、5mm、5.25mm 和 5.5mm，比较了流动模式、冲洗速度、剪切力。通过软件重建了曲率为 0°、5°、10°、20°和 30°的改良弯曲根管。在光学插入深度处更换平针头，并分析了冲洗效率的关键参数。
结果
工作长度缩短对冲洗效率有积极影响。在最佳工作长度下，在弯曲度更大的根管中，根尖冲洗液的替代、有效速度和壁剪切力显著提高。在相同的工作深度和类似的根管弯曲度下，真实根管的冲洗效率高于改良根管。
结论
短工作长度、大曲率和异常的根管内壁有助于提高冲洗效率。
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