Evaluation of Crack Formation and Propagation with Ultrasonic Root-End Preparation and Obturation Using a Digital Microscope and Optical Coherence Tomography
Evaluation of Crack Formation and Propagation with Ultrasonic Root-End Preparation and Obturation Using a Digital Microscope and Optical Coherence Tomography
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DOI：
10.1155/2019/5240430
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发表时间：
2019-12-31
期刊：
影响因子：
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通讯作者：
Okiji, Takashi
中科院分区：
文献类型：
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作者：
Rashed, Bayan;Iino, Yoshiko;Okiji, Takashi
Objective.本研究旨在确定（1）使用数字显微镜（DM）和光学相干断层扫描（OCT）进行根端切除、根端超声准备和根端填充对裂纹形成和扩展发生率的影响，以及（2）通过与作为参考标准的微型计算机断层扫描（micro-CT）进行比较，确定OCT对裂纹检测的性能。方法论对30颗离体下切牙进行根管治疗，并进行根端切除和根端超声预备。然后，将牙齿分为三组（n=10，每个），根端腔要么保持未填充，要么填充矿物三氧化物聚合物（MTA）或超级EBA。分别在根端切除、超声根端预备、根端充填后，用OCT和DM观察根端切除面，记录不完全裂纹和完全裂纹的发生率。两周、一个月、两个月后重复观察，两个月后的micro-CT扫描作为金标准。结果DM结果显示47%的样本在根端切除后形成牙本质裂纹，87%的样本在超声制备后形成牙本质裂纹。在超声制备之后，没有现有裂纹扩展成完整裂纹，但是形成新裂纹。MTA和super-EBA对裂纹的形成没有影响。OCT和DM之间的斯皮尔曼相关系数为0.186（极弱相关性; p=0.015）。与micro-CT相比，OCT的灵敏度和特异性分别为0.50和0.55，DM为1.00和0.35。McNemar检验显示OCT和DM之间存在显著差异（p
Objective. This study is aimed at determining (1) the effect of root-end resection, ultrasonic root-end preparation, and root-end filling on the incidence of crack formation and propagation by using a digital microscope (DM) and optical coherence tomography (OCT) and (2) the performance of OCT on the detection of cracks by comparing with microcomputed tomography (micro-CT) as a reference standard. Methodology. Thirty extracted lower incisors were endodontically treated and subjected to root-end resection and ultrasonic root-end cavity preparation. Then, the teeth were divided into three groups (n=10, each), and the root-end cavity was either left unfilled or filled with mineral trioxide aggregate (MTA) or super-EBA. The resected surface was observed with OCT and DM after the root-end resection, ultrasonic root-end preparation, and root-end filling, and the frequency of incomplete and complete cracks were recorded. The observation was repeated after two weeks, one month, and two months, and micro-CT scans after two months were taken as the gold standard. Results. The DM results show dentinal crack formation in 47% of the samples following root-end resection and in 87% following ultrasonic preparation. After the ultrasonic preparation, no existing crack propagated to a complete crack, but new cracks were formed. MTA and super-EBA had no effect on crack formation. The Spearman correlation coefficient between OCT and DM was 0.186 (very weak correlation; p=0.015). Sensitivity and specificity in comparison to micro-CT were 0.50 and 0.55 in OCT and 1.00 and 0.35 in DM, respectively. McNemar's test showed a significant difference between OCT and DM (p