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首页> 外文期刊>International endodontic journal >Effects of ultrasonic removal of fractured files from the middle third of root canals on dentinal cracks: a micro‐computed tomography study
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Effects of ultrasonic removal of fractured files from the middle third of root canals on dentinal cracks: a micro‐computed tomography study

机译：超声波从根部运河中三分之一对牙本质裂缝中的裂缝文件的影响：微计算机断层扫描研究

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Abstract Aim To evaluate the frequency of dentinal microcracks after ultrasonic removal of fractured files from the middle third of root canals using micro‐computed tomography (micro‐ CT ). Methodology Eighteen bilaterally matched pairs of human mandibular incisors extracted for periodontal reasons were included. The matched pairs of teeth were then divided into a control group and an experimental group, with one member of each pair assigned to each group. In the control group, the canals were instrumented using the ProTaper Next ( PTN ) system. In the experimental group, size 20?K‐files were fractured in the middle third of the root canals, followed by their ultrasonic removal. Subsequently, the canals were instrumented with the PTN system. All teeth were scanned using high‐resolution micro‐ CT before (preoperative) and after (intraoperative) file removal and after (postoperative) root canal preparation. Pre‐, intra‐, and postoperative cross‐sectional images of the roots were screened to identify the presence of dentinal defects. Two experienced observers evaluated the images twice in a blinded manner. The incidence of dentinal microcracks was noted and statistically analysed using Fisher's exact and McNemar's tests ( P? = ? 0.05), with the root cross‐section and the tooth root as the units of analysis, respectively. Results All fractured files in the experimental group were removed successfully. New microcracks were detected in 0.56% (93/16?472) cross‐sections (8/18 specimens) generated after file removal in the experimental group. These microcracks were detected 4–6?mm below the root canal orifice and exhibited a width and length of 12–36?μm and 48–72?μm, respectively. They did not disappear or propagate after canal preparation. No new dentinal microcracks were observed in the control group. There was a significant difference in the incidence of new microcracks between the two groups ( P? ? 0.05). Conclusions Ultrasonic removal of fractured files from root canals resulted in the formation of short microcracks in a small number of cross‐sections in approximately half the specimens. Further studies are necessary to determine the cause and consequences of this finding.
机译：摘要旨在使用微计算机断层扫描（Micro-CT）超声波从根管中间三分之一的裂缝文件超声波除去牙本质微裂纹的频率。包括围绕原因提取的18对双侧双侧匹配的人颌骨牙髓对。然后将匹配的牙齿对被分成对照组和实验组，每对一体的一体成员分配给每组。在对照组中，运河使用Protaper Next（PTN）系统进行仪器。在实验组中，尺寸20？k文件在根运河的中间三分之一的中间裂缝，然后进行超声波去除。随后，将运河用PTN系统进行仪表。在（术前）和（术中）去除之前和（术后）根管准备之后，使用高分辨率微型CT扫描所有牙齿。筛选根的预，和术后横截面图像以识别牙本质缺陷的存在。两位经验丰富的观察者以盲目的方式评估图像两次。注意到牙本质微裂纹的发病率并使用Fisher的精确和McNemar的测试（P？= 0.05），以及根横截面和齿根作为分析单位的统计分析。结果实验组中的所有裂缝文件已成功删除。在实验组中除草后的0.56％（93/16〜472）横截面（8/18样本）中检测到新的微裂纹。将这些微裂纹检测到根管孔下方4-6Ωmm，并分别显示出12-36Ωμm和48-72μm的宽度和长度。运河准备后没有消失或传播。对照组没有观察到新的牙齿微裂纹。两组之间的新微裂纹的发生率有显着差异（P？＆ 0.05）。结论超声波从根流管中移除裂缝文件导致在大约一半的横截面中形成短微裂纹。进一步的研究是确定这一发现的原因和后果。

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