Postgraduate Program in Endodontics, Universidad Europea de Madrid, Madrid, Spain.
Facultad de Odontología, Universidad Nacional de Asunción, Asunción, Paraguay.
J Endod. 2018 May;44(5):838-841. doi: 10.1016/j.joen.2018.01.006. Epub 2018 Mar 20.
A greater irrigant volume improves the effectiveness of root canal irrigation. The purpose of this study was to compare 2 negative pressure systems regarding the volume of irrigant collected from the apical area in moderately curved canals at 3 different flow rates of delivery in vitro.
The mesiobuccal canals of 30 molars with a curvature between 20° and 40° were prepared to size #40.04 taper. A closed system was created. The canals were irrigated at 3, 6, and 12 mL/min for 30 seconds using EndoVac (SybronEndo, Orange, CA) and the INP needle (Mixnus Fine Engineering Co Ltd, Nagano, Japan) (both independent variables). A recovery trap was used to collect the irrigant aspirated by the negative pressure needles. Irrigant volume (dependent variable) was measured in milliliters. Data were analyzed using mixed analysis of variance.
There was a statistically significant interaction between the negative pressure system and the irrigant volume collected (P < .0005). The mean irrigant volume collected by the different negative pressure systems was greater for INP at 3 (P < .001), 6 (P < .001), and 12 mL/min (P < .001) flow rate. Both negative pressure needles showed statistically significant differences (P < .001) between mean irrigant volume collected at different flow rates.
A greater volume was collected by increasing the flow rate of irrigant delivery for both EndoVac and INP. The INP needle could collect a greater volume of irrigant from the apical third compared with EndoVac at all 3 different flow rates.
更大的冲洗液体积可提高根管冲洗的效果。本研究旨在比较两种负压系统在 3 种不同输送流速下，对中度弯曲根管根尖区冲洗液收集量的影响。
对 30 颗具有 20°至 40°弯曲度的磨牙的近中颊根管进行预备至 #40.04 锥度。创建一个封闭系统。使用 EndoVac（SybronEndo，Orange，CA）和 INP 针（Mixnus Fine Engineering Co Ltd，Nagano，Japan）以 3、6 和 12 mL/min 的流速冲洗 30 秒（两个独立变量）。使用回收陷阱收集负压针吸出的冲洗液。以毫升为单位测量冲洗液体积（因变量）。数据采用混合方差分析进行分析。
负压系统与收集的冲洗液体积之间存在统计学显著的相互作用（P <.0005）。不同负压系统收集的平均冲洗液体积，INP 在 3（P <.001）、6（P <.001）和 12 mL/min（P <.001）流速时更大。两种负压针在不同流速下收集的平均冲洗液体积均存在统计学显著差异（P <.001）。
两种负压系统均通过增加冲洗液输送流速来增加冲洗液的收集量。与 EndoVac 相比，INP 针在所有 3 种不同流速下，从根尖部收集的冲洗液量更多。
