Comparison of cleaning efficiency and deformation characteristics of Twisted File and ProTaper rotary instruments.
Comparison of cleaning efficiency and deformation characteristics of Twisted File and ProTaper rotary instruments.
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Twisted File 和 ProTaper 旋转器械的清洁效率和变形特征比较
DOI：
10.4103/1305-7456.130598
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发表时间：
2014-04
影响因子：
--
通讯作者：
Song Y
中科院分区：
文献类型：
--
作者：
Li H;Zhang C;Li Q;Wang C;Song Y
目的：本研究旨在比较Twisted File（TF）和ProTaper（PT）镍钛机用器械在根管预备中的清洁效率和变形特性。材料与方法：从26颗离体上颌第一磨牙中选取52个根管，随机分为两组，每组13个近颊根管和12个远颊根管。两个DB管作为空白对照。记录预备时间，扫描电镜下观察根管、中根管、冠根管中的碎屑和玷污层数量。在显微计算机断层扫描仪下分别对根管预备前后距根尖孔3 mm、5 mm和7 mm处的3个断面进行扫描。用Photoshop CS4计算3个水平的横截面积变化。在扫描电镜下观察了锉的变形情况。两组比较采用Mann-Whitney检验和独立样本t检验。结果：TF预备根管后，根管冠部碎屑和玷污层减少（P = 0.006，P = 0.001）。TF组在距根尖孔5 mm的横截面上显示出比PT组更多的CSA变化（P = 0.045），并且比PT组花费的准备时间显著更少（P = 9.06 <$10 −28）。所有5个TF文件没有明显的微裂纹和25个PT文件中的两个有许多微裂纹显示出可见的解绕变形。结论：TF和PT均不能达到根管壁的完全清洁。它们的变形特征可能指示不同的断裂阻力。TF单根管预备技术可大大缩短根管预备时间。
Objective: The objective of the following study is to compare the cleaning efficiency and deformation characteristics of Twisted File (TF) and ProTaper (PT) nickel-titanium rotary instruments in root canal preparation. Materials and Methods: A total of 52 canals from 26 extracted maxillary first molars were randomly assigned into two groups of each including 13 mesiobuccal and 12 distobuccal (DB) canals. Two DB canals were as blank controls. After preparation with TF and PT, we recorded the preparation time and evaluate the amounts of debris and smear layer at apical, middle and coronal canals under scanning electron microscopy (SEM). Three cross-sections of canals at 3 mm, 5 mm and 7 mm from the apex foramens were scanned before and after preparation under micro-computed tomography. Changes of the cross-section area (CSA) at the three levels were calculated with Photoshop CS4. File deformation was also investigated under SEM. Two groups were statistically compared with Mann-Whitney test and independent sample t-test. Results: Less debris and smear layer were found in coronal regions of canals prepared with TF (P = 0.006, P = 0.001, respectively). TF group displayed more CSA change than PT group (P = 0.045) at cross-sections of 5 mm from the apex foramens and took significantly less preparation time than PT group did (P = 9.06 Χ 10 −28 ). All five TF files without obvious micro-cracks and two out of 25 PT files with many micro-cracks showed visible unwound deformation. Conclusion: Neither TF nor PT achieves complete cleanliness of canal walls. Their deformation features might indicate different fracture resistance. TF single-file technique would substantially shorten the time of root canal preparation.