Department of Endodontics, Dental Faculty, Süleyman Demirel University, Isparta, Turkey.
J Dent Educ. 2012 Apr;76(4):509-13.
The purposes of this study were to evaluate the ability of a group of third-year dental students without any endodontic clinical experience to use the ProTaper Instruments (Dentsply Maillefer) to decrease the amount of straightening of curved canals on human molar teeth and to determine the incidence of instrument fractures and instrumentation time. Thirty-one undergraduate dental students in Turkey received a training session. The students prepared a total of 144 root canals in human mandibular or maxillary molar teeth with ProTaper. Fifty-six teeth were excluded due to unreadable image, misinformation, or straight or severe curve. Using pre- and post-preparation digital radiographs, the straightening of curved root canals was investigated. Loss of working length and incidence of fracture were also noted. A total of eighty-eight curved root canals were selected. Mesiobuccal or mesiolingual roots with curvatures of between 20° and 43° as assessed by Schneider's method and working length of between 15 mm and 22.5 mm were included in the study. The means of the curved root canals before and after the instrumentation were 29.5° ± 6° and 27° ± 6.3°, respectively. The means of the working length before and after the instrumentation were 19 mm ± 2.1 mm and 18.3 mm ± 1.9 mm, respectively. A statistically significant difference between straightening of curved root canals and loss of working length was found between before and after instrumentation (p<0.000). The mean straightening of curved root canals and loss of working length after preparation with the size F1 ProTaper file were 2.5 mm ± 3.6 mm and 0.7 mm ± 0.6 mm, respectively. Only two F1 ProTaper instruments fractured at the apical level. The study concluded that rotary instruments performed adequately with inexperienced operators who received a brief structured training session.
本研究的目的是评估一组没有任何牙髓临床经验的三年级牙科学生使用 ProTaper 器械（登士柏 Maillefer）减少人磨牙弯曲根管拉直量的能力，并确定器械折断和器械使用时间的发生率。土耳其的 31 名本科牙科学生接受了培训课程。学生们使用 ProTaper 预备了总共 144 个人类下颌或上颌磨牙的根管。由于无法读取图像、信息错误或根管为直或严重弯曲，56 颗牙齿被排除在外。使用预备前和预备后的数字射线照片，研究了弯曲根管的拉直情况。还记录了工作长度的损失和器械折断的发生率。总共选择了 88 个弯曲根管。研究纳入了用 Schneider 法评估的弯曲度在 20°至 43°之间、工作长度在 15 毫米至 22.5 毫米之间的颊舌向或近中舌向的根。预备前后弯曲根管的平均值分别为 29.5°±6°和 27°±6.3°。预备前后工作长度的平均值分别为 19 毫米±2.1 毫米和 18.3 毫米±1.9 毫米。预备前后根管的弯曲拉直和工作长度的损失之间存在统计学上的显著差异（p<0.000）。使用 F1 ProTaper 锉预备后弯曲根管的平均拉直和工作长度损失分别为 2.5 毫米±3.6 毫米和 0.7 毫米±0.6 毫米。只有两个 F1 ProTaper 器械在根尖水平折断。研究结论是，经验不足的操作人员在接受简短的结构化培训课程后，旋转器械的性能令人满意。
