Pasqualini Damiano, Scotti Nicola, Tamagnone Lorenzo, Ellena Federica, Berutti Elio
Department of Endodontics, School of Dentistry, University of Turin, Turin, Italy.
J Endod. 2008 Mar;34(3):314-7. doi: 10.1016/j.joen.2007.12.017.
The aim of this study was to compare the effective shaping time and number of rotations required by an endodontist working with hand and rotary ProTaper instruments to completely shape simulated root canals. Eighty Endo Training Blocks (curved canal shape) were used. Manual preflaring was performed with K-Flexofiles #08-10-12-15-17 and #20 Nitiflex at a working length of 18 mm. Specimens were then randomly assigned to 2 different groups (n = 40); group 1 was shaped by using hand ProTaper and group 2 with ProTaper rotary. The number of rotations made in the canal and the effective time required to achieve complete canal shaping were recorded for each instrument. Differences between groups were analyzed with the nonparametric Mann-Whitney U test (P < .05). Hand ProTaper required significantly fewer rotations (P < .001) than rotary ProTaper, whereas the effective working time to fully shape the simulated canal was significantly higher (P < .001) with hand ProTaper.
本研究的目的是比较牙髓病医生使用手动和旋转ProTaper器械完全预备模拟根管所需的有效预备时间和旋转次数。使用了80个根管训练模块（弯曲根管形态）。使用K-Flexofiles #08-10-12-15-17和#20 Nitiflex在工作长度18 mm处进行手动预扩。然后将样本随机分为2个不同的组（n = 40）；第1组使用手动ProTaper进行预备，第2组使用旋转ProTaper进行预备。记录每种器械在根管内的旋转次数以及完成根管完全预备所需的有效时间。使用非参数Mann-Whitney U检验分析组间差异（P < .05）。手动ProTaper所需的旋转次数显著少于旋转ProTaper（P < .001），而使用手动ProTaper完全预备模拟根管的有效工作时间显著更长（P < .001）。
