Root Canal Preparation of Mandibular Molars with 3 Nickel-Titanium Rotary Instruments: A Micro-Computed Tomographic Study
Root Canal Preparation of Mandibular Molars with 3 Nickel-Titanium Rotary Instruments: A Micro-Computed Tomographic Study
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DOI：
10.1016/j.joen.2014.06.023
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发表时间：
2014-11-01
影响因子：
4.2
通讯作者：
Haapasalo, Markus
中科院分区：
文献类型：
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作者：
Zhao, Dan;Shen, Ya;Haapasalo, Markus
简介：本研究的目的是通过微型计算机断层扫描（micro-CT）描述ProTaper Next（PTN; Dentsply Maillefer，Ballaigues，Switzerland）、ProTaper Universal（PTU; Dentsply塔尔萨牙科专业产品，约翰逊城，TN）和WaveOne（Dentsply Maillefer）镍钛器械在下颌第一磨牙中的根管成形性能。研究方法：选择36颗上颌第一磨牙，分别在近中2根和远中1根根，采用体素30 dam的micro-CT扫描，术前、术后进行扫描。在次氯酸盐冲洗下，使用PTU、PIN和WaveOne系统准备根管。测量未处理根管的体积;准备后去除的牙本质体积;未器械化区域的量;以及根管向冠状、中间和顶端三分之一的运输。记录准备时间和仪器故障情况。结果：根管预备后，根管体积和表面积增加。远中根管预备面的比例显著高于近中根管（P <0.05）。PTN系统在近中根管的顶端三分之一处产生的运输量少于WaveOne和PTU系统（P < .05）。3种器械对根尖移动的影响无显著性差异。使用WaveOne的器械明显快于其他2种器械（P < .05）。结论：PTN、PTU和WaveOne器械在离体下颌第一磨牙根管成形中无明显误差。使用PIN制备的弯曲根管的根尖运输比使用WaveOne和PTU制备的根管少。
Introduction: The-aim of this study,was to describe the canal shaping properties of ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland), ProTaper Universal (PTU; Dentsply Tulsa Dental Specialties, Johnson City, TN), and WaveOne (Dentsply Maillefer) nickel-titanium instruments in mandibular first molars by using micro computed tomographic (micro-CT) scanning. Methods: A total of 36 maxillary first molars with 2 separate mesial canals and 1 distal canal were selected and scanned preoperatively and postoperatively by using micro-CT scanning with a voxel size of 30 dam. Canals were prepared with PTU, PIN, and WaveOne systems under hypochlorite irrigation. The volume of the untreated canal; the volume of dentin removed after preparation; the amount of the uninstrumented area; and the transportation to the coronal, middle, and apical thirds of canals were measured. The preparation time and instrument failure were also recorded. Results: Instrumentation of canals increased their volume and surface area. The distal canals had a significantly higher proportion of unprepared surfaces than mesial canals (P < .05). The PTN system produced less transportation than the WaveOne and PTU systems in the apical third of the mesial canals (P < .05). There was no significant difference on apical transportation in distal canals among the 3 instrument systems. Instrumentation with WaveOne was significantly faster than with the other 2 instruments (P < .05). Conclusions: The PTN, PTU, and WaveOne instruments shaped root canals in mandibular first molars in vitro without significant shaping errors. The curved canals prepared using PIN had less apical transportation than the canals prepared using WaveOne and PTU.