Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil.
Department of Dentistry II, Federal University of Maranhão, São Luís, Brazil.
Int Endod J. 2019 Mar;52(3):337-342. doi: 10.1111/iej.13000. Epub 2018 Sep 14.
To assess the shaping ability of the new XP-endo Shaper instrument after different working times.
Ten mesial roots of mandibular molars were scanned in a micro-computed tomographic device and prepared using the XP-endo Shaper instrument up to the working length (WL) according to the manufacturer's recommendation. Then, each specimen was subjected to an extra 15, 30 and 45 s of active instrumentation at the WL. Postoperative scans were performed after canal preparation at each time-point. Then, the registered pre- and postoperative datasets were examined to evaluate the percentages of volume and surface area of the instrumented canal, surface area of noninstrumented canal areas and the volume of removed dentine. Repeated measures general linear model was used to compare the differences in either the increase or the reduction of the parameters amongst the time-points. Alpha-error was set at 5%.
Extending the period of XP-endo Shaper active instrumentation at WL significantly influenced several parameters such as volume (P < 0.001) and surface area (P < 0.001) of the instrumented canal, surface area of noninstrumented canal areas (P < 0.001), and volume of removed dentine (P < 0.001).
Extending the activation time of XP-endo Shaper instruments at WL resulted in a more comprehensive root canal preparation, increasing the volume and surface area of root canal preparation and the volume of removed dentine.
评估新 XP-endo Shaper 器械在不同工作时间后的成形能力。
在微计算机断层扫描设备中扫描 10 个下颌磨牙的近中根，并根据制造商的建议使用 XP-endo Shaper 器械预备至工作长度（WL）。然后，每个标本在 WL 处额外进行 15、30 和 45 秒的主动器械操作。在每个时间点进行根管预备后进行术后扫描。然后，检查登记的术前和术后数据集，以评估器械根管的体积和表面积百分比、未器械根管区域的表面积和去除牙本质的体积。使用重复测量一般线性模型比较各时间点参数增加或减少的差异。误差α设为 5%。
在 WL 处延长 XP-endo Shaper 器械的主动操作时间显著影响了几个参数，如器械根管的体积（P<0.001）和表面积（P<0.001）、未器械根管区域的表面积（P<0.001）和去除牙本质的体积（P<0.001）。
在 WL 处延长 XP-endo Shaper 器械的激活时间可导致更全面的根管预备，增加根管预备的体积和表面积以及去除牙本质的体积。
