Department of Restorative Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia.
Department of Restorative Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia, e-mail:
J Contemp Dent Pract. 2021 Dec 1;22(12):1471-1476.
To compare the effect of glide path and coronal flaring on the centering ability and transportation in curved canals prepared by different NiTi instruments using micro-CT.
The mesiobuccal canal of 48 extracted mandibular molars was selected and divided into two groups of 24 each according to the type of instrument used, either Race Evo or EdgeSequel. Each group was further divided into three subgroups: Group I: without glide path and coronal flaring (control); Group II: with glide path and without coronal flaring; Group III: with glide path and coronal flaring. Following access opening and working length determination, coronal flaring and glide path were done in the required groups. The canals were then prepared according to the assigned instruments and assessed using micro-CT at 3, 5, and 7 mm of the root canal. Data of pre- and postoperative measurements were statistically analyzed using SPSS.
The mean value of centering ability was 0.39 (SD 0.36) while the mean value of transportation ability was 0.002 (SD 0.153). Transportation and centering ability did not vary significantly among the tested groups of rotary instruments. Comparison of centering and transportation among root canal instrumentation groups at 3, 5, and 7 mm showed no statistical significance ( >0.05).
No significant difference was found among the tested groups regarding transportation and centering ability.
This study provided data on the effect of glide path and coronal flaring on the centering ability and transportation on curved canals prepared by Race Evo and EdgeSequel. Coronal flaring and glide path did not affect the centering ability and transportation.
通过微 CT 比较不同镍钛器械在预备弯曲根管时，导丝道和根管口敞开对其根管中心定位能力和根管偏移的影响。
选择 48 颗下颌第一磨牙，根据使用的器械类型（Race Evo 或 EdgeSequel）将其分为两组，每组 24 颗。每组再根据是否使用导丝道和根管口敞开进一步分为 3 个亚组：I 组：不使用导丝道和根管口敞开（对照组）；II 组：使用导丝道，不进行根管口敞开；III 组：使用导丝道和根管口敞开。在完成开髓和工作长度确定后，在需要的组中进行根管口敞开和导丝道预备。然后根据指定的器械预备根管，并在根管的 3、5 和 7mm 处使用微 CT 进行评估。使用 SPSS 对术前和术后测量数据进行统计学分析。
根管中心定位能力的平均值为 0.39（标准差 0.36），而根管偏移能力的平均值为 0.002（标准差 0.153）。旋转器械测试组之间的根管中心定位能力和根管偏移能力没有显著差异。在 3、5 和 7mm 处比较根管预备组的根管中心定位和偏移，没有统计学意义（>0.05）。
在测试的各组中，没有发现根管中心定位能力和偏移能力有显著差异。
本研究提供了 Race Evo 和 EdgeSequel 镍钛器械预备弯曲根管时导丝道和根管口敞开对根管中心定位能力和偏移的影响的数据。根管口敞开和导丝道预备不会影响根管中心定位能力和偏移。
