D'Amario Maurizio, De Angelis Francesco, Mancino Maddalena, Frascaria Massimo, Capogreco Mario, D'Arcangelo Camillo
Unit of Restorative Dentistry, Endodontics and Oral Pathology, Department of Life, Health and Environmental Sciences, Dental Clinic, University of L'Aquila, L'Aquila, Italy.
Unit of Restorative Dentistry, Department of Oral Science, Nano and Biotechnology, "G. D'Annunzio" University of Chieti, Chieti, Italy.
J Dent Sci. 2017 Dec;12(4):328-332. doi: 10.1016/j.jds.2017.03.001. Epub 2017 Apr 3.
BACKGROUND/PURPOSE: This study compared maintenance of canal anatomy, occurrence of apical transportation, and working time observed after instrumentation with One Shape New Generation rotary system (Micro-Mega), with those observed after instrumentation with Reciproc (VDW) and WaveOne (Dentsply-Maillefer) reciprocating systems.
The mesial canals of 45 mandibular molars (curvature angles between 35° and 45°) were selected. Specimens were randomly divided into three groups, and canal preparations were performed using One Shape, Reciproc, or WaveOne systems (size #25). A digital double radiographic technique was used to determine apical transportation and change in angle of curvature. Also, working time and instrument failures were recorded. Data were statistically analyzed.
During preparation, no file fractured. No statistically significant differences were found among groups. No system showed a significantly faster preparation time than others (P > 0.05). All instruments maintained the original canal curvature well and were safe to use.
Both continuous rotary instrument and reciprocating systems did not have any influence on the presence of apical transportation or caused an alteration in angle of canal curvature.
背景/目的：本研究比较了使用新一代One Shape旋转系统（Micro-Mega）进行根管预备后观察到的根管解剖结构的维持情况、根尖偏移的发生率和操作时间，与使用Reciproc（VDW）和WaveOne（Dentsply-Maillefer）往复式系统进行根管预备后观察到的情况。
选取45颗下颌磨牙的近中根管（弯曲角度在35°至45°之间）。样本随机分为三组，分别使用One Shape、Reciproc或WaveOne系统（25号）进行根管预备。采用数字双X线摄影技术确定根尖偏移和弯曲角度的变化。同时，记录操作时间和器械故障情况。对数据进行统计学分析。
预备过程中，无锉针折断。各组之间未发现统计学上的显著差异。没有一种系统的预备时间明显快于其他系统（P>0.05）。所有器械均能很好地维持根管原有的弯曲度，且使用安全。
连续旋转器械和往复式系统对根尖偏移的发生均无影响，也未导致根管弯曲角度的改变。
