Department of Conservative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
Department of Conservative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
J Endod. 2021 Jun;47(6):976-981. doi: 10.1016/j.joen.2021.03.003. Epub 2021 Mar 16.
This laboratory-based study aimed to investigate the quantitative amount of apically extruded debris from severely curved root canals and the preparation time for the novel rotary system TruNatomy (TN; Dentsply Sirona, Charlotte, NC) compared with Reciproc Blue (RCB; VDW Dental, Munich, Germany), HyFlex (HyFlex Controlled Memory [HCM; Coltene/Whaledent, Altstatten, Switzerland] and HyFlex EDM [HEDM, Coltene/Whaledent]), and ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland) rotary systems.
One hundred mandibular molar human teeth with severe curvature of the mesiobuccal canal (25°-45°) were included in the present study. The specimens were randomly distributed into 5 balanced groups (n = 20): TN, RCB, HCM, PTN, and HEDM. The amount of extruded debris for each group during instrumentation at body temperature was collected in an Eppendorf tube. After desiccation, the mean debris weights for each group were calculated. The total preparation time for each group was also recorded. Data were statistically analyzed using the Kruskal-Wallis test at a significance level of P < .05.
The HCM and HEDM groups extruded a significantly higher amount of debris than the other tested groups (P < .001). TN extruded the least amount of debris, but it was not significantly different compared with the RCB and PTN groups (P > .05). In terms of preparation time, the TN group did not show any significant difference compared with the other groups.
All instrumentation systems extruded debris. TN was among the groups that produced the lowest amount of apically extruded debris that is clinically acceptable. The amount of apically extruded debris using the TN system was equal to 2 popular systems and statistically significantly less than 2 other popular systems studied.
本实验室研究旨在比较新型旋转系统 TruNatomy（TN；登士柏西诺德，夏洛特，NC）与 Reciproc Blue（RCB；VDW Dental，慕尼黑，德国）、HyFlex（HyFlex 控制记忆 [HCM；高露洁/登士柏，阿尔特施塔特，瑞士] 和 HyFlex EDM [HEDM，高露洁/登士柏]）和 ProTaper Next（PTN；登士柏马尼费，巴利亚斯，瑞士）旋转系统在严重弯曲根管中根管内切削物的定量挤出量和准备时间。
本研究纳入了 100 颗下颌磨牙，具有近中颊根管的严重弯曲度（25°-45°）。将标本随机分为 5 个平衡组（n = 20）：TN、RCB、HCM、PTN 和 HEDM。在体温下对每组仪器进行操作时，收集挤出的碎屑量并收集在离心管中。干燥后，计算每组的平均碎屑重量。还记录了每组的总准备时间。使用 Kruskal-Wallis 检验在显著水平 P <.05 下对数据进行统计分析。
HCM 和 HEDM 组挤出的碎屑量明显高于其他测试组（P <.001）。TN 挤出的碎屑量最少，但与 RCB 和 PTN 组相比无显著差异（P >.05）。就准备时间而言，TN 组与其他组之间没有任何显著差异。
所有仪器系统都有碎屑挤出。TN 是产生临床可接受的最少根尖挤出碎屑量的组之一。TN 系统产生的根尖挤出碎屑量与 2 种流行系统相等，且统计学上明显少于研究的另外 2 种流行系统。
