Bane Khaly, Faye Babacar, Sarr Mouhamed, Niang Seydina O, Ndiaye Diouma, Machtou Pierre
Conservative Dentistry and Endodontics Service, Department of Dentistry, Faculty of Medicine, Pharmacy and Odontology-Stomatology, Cheikh Anta Diop University of Dakar, Dakar, Senegal;
Public Hospitals of Paris, Dentistry Service, Pitié Salpêtrière University Hospital, Paris ,France.
Iran Endod J. 2015;10(2):135-9. Epub 2015 Mar 18.
The aim of this study was to compare the shaping ability of two single-file systems and conventional rotary instruments in severely curved root canals of extracted human molars.
Mesiobuccal canals of 120 mandibular molars with angles of curvature ranging between 25(°) and 35(°) and radii of curvature from 5 to 9 mm, were divided into three groups (n=40). In each group the canals were instrumented with either WaveOne (W), Reciproc (R) or ProTaper (P). The time required for canal shaping and the frequency of broken instruments were recorded. The standardized pre and post-instrumentation radiographs were taken to determine changes in working length (WL) and straightening of canal curvature. The presence of blockage or perforation was also evaluated. Data were analyzed using the one-way analysis of variance (ANOVA) and post-hoc Tukey's test. The level of significance was set at 0.05.
Both single-instrument systems reduced the canal preparation time by approximately 50% (P<0.05). No incidence of broken instruments from single-file systems was reported; however, two F2 instruments in the P group were broken (P<0.05). Reduction in WL and straightening of canal curvature was observed in all three systems with the highest scores belonging to P system (P<0.05). No case of blockage or perforation was found during shaping in any group.
Single-file systems shaped curved canals with substantial saving in time and a significant decrease in incidence of instrument separation, change in WL, and straightening of canal curvature.
本研究旨在比较两种单根锉系统与传统旋转器械在拔除的人磨牙严重弯曲根管中的塑形能力。
选取120颗下颌磨牙的近中颊根，其弯曲角度在25°至35°之间，弯曲半径为5至9毫米，分为三组（n = 40）。每组根管分别用WaveOne（W）、Reciproc（R）或ProTaper（P）器械进行预备。记录根管塑形所需时间和器械折断频率。拍摄标准化的术前和术后X线片，以确定工作长度（WL）的变化和根管弯曲度的变直情况。还评估了根管堵塞或穿孔的情况。数据采用单因素方差分析（ANOVA）和事后Tukey检验进行分析。显著性水平设定为0.05。
两种单器械系统均将根管预备时间缩短了约50%（P < 0.05）。单根锉系统未报告器械折断情况；然而，P组有两根F2器械折断（P < 0.05）。在所有三个系统中均观察到WL缩短和根管弯曲度变直，其中P系统得分最高（P < 0.05）。在任何组的塑形过程中均未发现堵塞或穿孔情况。
单根锉系统在弯曲根管塑形方面节省了大量时间，器械分离发生率、WL变化和根管弯曲度变直均显著降低。
