Labbaf Hossein, Nazari Moghadam Kiumars, Shahab Shahriar, Mohammadi Bassir Mahshid, Fahimi Mohammad Amin
Department of Endodontics, Dental School, Shahed University, Tehran, Iran.
Department of Oral and Maxillofacial Radiology, Dental School, Shahed University, Tehran, Iran.
Iran Endod J. 2017 Summer;12(3):307-311. doi: 10.22037/iej.v12i3.13540.
As a consequence of root canal preparation, dentinal chips, irrigants and pulp remnants are extruded into preradicular space. This phenomenon may lead to post endodontic flare-ups. The purpose of this study was to compare the amount of extruded debris with four endodontic NiTi engine-driven systems.
Sixty mesiobuccal roots of maxillary molars with 15-30˚ curvature were divided randomly into four groups (=15). Each group was instrumented up to apical size of 25 using Reciproc, ProTaper Universal, Neolix and Hyflex. Bidistilled water was used as irrigant and extruded debris was collected in pre-weighted Eppendorf tubes. Tubes were stored in incubator for drying the debris. Extruded debris were weighted in electronic microbalance with accuracy of 0.0001 g. The raw data was analyzed with one way analysis of variance (ANOVA) and Tukey's HSD post hoc test. Level of significance was set at 0.05.
The debris extrusion with Reciproc files was significantly higher than the other groups (<0.05). Hyflex significantly extruded less debris than other files (<0.05). There was no significant difference between ProTaper Universal and Neolix regarding the amount of extruded debris (=0.98).
All systems extruded debris during the instrumentation. Reciproc system significantly extruded more debris. Caution should be taken when interpreting the results of this study and applying it to the real clinical situation.
根管预备会导致牙本质碎屑、冲洗液和牙髓残余物被挤出到根尖周间隙。这种现象可能会导致根管治疗后的急性发作。本研究的目的是比较四种牙髓镍钛机动系统挤出碎屑的量。
将60个弯曲度为15 - 30˚的上颌磨牙近中颊根随机分为四组（每组 = 15）。每组使用Reciproc、ProTaper Universal、Neolix和Hyflex器械预备至根尖尺寸25。使用双蒸水作为冲洗液，挤出的碎屑收集在预先称重的Eppendorf管中。将管子储存在培养箱中干燥碎屑。在精度为0.0001 g的电子微量天平上对挤出的碎屑进行称重。对原始数据进行单因素方差分析（ANOVA）和Tukey's HSD事后检验。显著性水平设定为0.05。
Reciproc锉挤出的碎屑明显多于其他组（P < 0.05）。Hyflex挤出的碎屑明显少于其他锉（P < 0.05）。ProTaper Universal和Neolix在挤出碎屑量方面没有显著差异（P = 0.98）。
所有系统在器械预备过程中都会挤出碎屑。Reciproc系统挤出的碎屑明显更多。在解释本研究结果并将其应用于实际临床情况时应谨慎。
