Interinstitutional PhD program, State University of Montes Claros, Montes Claros, MG, Brazil.
Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
J Appl Oral Sci. 2014 Apr;22(2):98-102. doi: 10.1590/1678-775720130464.
This study evaluated apical transportation associated with ProTaper Universal Fl, F2 and F3 rotary files in curved canais prepared by undergraduate students.
Twenty mesial roots of mandibular molars with curvatures ranging between 25° and 35° were selected. Mesiobuccal canals were instrumented by twenty students with the ProTaper system (Dentsply-Maillefer, Ballaigues, Switzerland) according to the manufacturer's instructions. Pre-fiaring was performed with Sl and SX files. A #15 K-file was inserted into the root canal up to the working length (WL), and an initial digital radiograph was taken in a buccolingual direction (baseline). Afterwards, the S1, S2, F1, F2, and F3 files were employed up to the WL. Other radiographies were taken in the same orientation of the baseline after the use of the Fl, F2, and F3 files, with each file inserted into the root canal. The radiographic images were overlapped, and the Image J software was used to measure the distance between the rotary files' ends and the #15 K-file's end, characterizing the apical transportation. Data were analyzed by Repeated Measure ANOVA and by the SNK post hoc test (P<0.05).
It was verified that file size affected apical transportation significantly (P<0.001). The F3 file showed higher apical transportation than Fl and F2, while between these last files there was no difference.
The undergraduate students produced lower apical transportation in curved canals when they did not use the F3 rotary file.
本研究评估了本科生预备弯曲根管时，ProTaper Universal 锉的 F1、F2 和 F3 号锉在根尖区的器械运输情况。
选择 20 颗下颌磨牙近中颊根管有 25°至 35°弯曲的牙。20 位学生按照制造商的说明使用 ProTaper 系统（Dentsply-Maillefer，Ballaigues，瑞士）预备根管。预弯使用 Sl 和 SX 锉。将 #15 K 锉插入根管至工作长度（WL），并在颊舌向拍摄初始数字射线照片（基线）。然后，使用 S1、S2、F1、F2 和 F3 锉至 WL。在 Fl、F2 和 F3 锉使用后，以相同的基线方向拍摄其他射线照片，每次将锉插入根管。重叠射线照片，使用 Image J 软件测量旋转锉末端和 #15 K 锉末端之间的距离，以表征根尖运输。使用重复测量方差分析和 SNK 事后检验（P<0.05）对数据进行分析。
发现锉型号显著影响根尖运输（P<0.001）。F3 锉的根尖运输距离大于 Fl 和 F2，而 Fl 和 F2 之间无差异。
本科生预备弯曲根管时，如果不使用 F3 号旋转锉，根尖区的器械运输量较低。
