The Bond Strength of Root Canal Filling after Calcium Hydroxide Removal with a Simple Apical Negative Pressure Kit in Oval-Shaped Root Canal.

Pub Date : 2023-04-01 Epub Date: 2022-11-11 DOI:10.4103/ccd.ccd_583_21

Warat Leelapornpisid, Thanapat Sastraruji, Phumisak Louwakul, Anat Dewi

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Abstract

Background: The aim of this study was to evaluate the effect of a simple irrigating device, which produced from the apical negative pressure concept, as a final irrigating method after calcium hydroxide (CH) medication on the bond strength of epoxy resin-based sealer in the oval-shaped root canal.

Methods: Forty-eight single-rooted premolars with oval-shaped canals were included in the study. The crown was decoronized and canal instrumented with Mtwo (VDW GmbH, Munich, Germany) up to size 40/04. The specimens were assigned to four groups according to the irrigation protocol after 1 week of CH medication: control group (no medication) and three experimental groups conventional needle irrigation (CNI), passive ultrasonic irrigation (PUI), and simple apical negative pressure kit (sANP). The teeth were obturated with a warm vertical technique using epoxy resin-based sealers. After 1 week, the roots were transversally sectioned at coronal, middle, and apical thirds. A push-out test was performed by a universal testing machine, and statistical analysis was performed using One-Way ANOVA with Duncan's post hoc test.

Results: The bond strength in the control group was significantly higher than the CNI group in all root canal thirds (P < 0.05). At coronal third, sANP showed lower bond strength than PUI group (P < 0.05). However, the bond strength of sANP group was comparable to the control group (P > 0.05) which was significantly higher than the PUI group at apical third (P < 0.05).

Conclusion: A sANP enhanced the bond strength of epoxy resin-based sealer in the apical third of CH-medicated root canal in the oval-shaped canal.

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简单根尖负压试剂盒去除氢氧化钙后根管充填在椭圆形根管中的结合强度。

背景：本研究的目的是评估一种由根尖负压概念产生的简单冲洗装置，作为氢氧化钙（CH）用药后的最终冲洗方法，对椭圆形根管中环氧树脂基封闭剂的粘结强度的影响。方法：48颗具有椭圆形根管的单根前磨牙被纳入研究。对牙冠进行去离子化处理，并用Mtwo（德国慕尼黑VDW GmbH）对其进行管内器械测量，尺寸为40/04。CH给药1周后，根据冲洗方案将标本分为四组：对照组（不给药）和三个实验组常规针头冲洗（CNI）、被动超声冲洗（PUI）和简单根尖负压试剂盒（sANP）。使用环氧树脂基密封剂，采用温暖的垂直技术对牙齿进行封闭。1周后，根在冠状、中间和顶端三分之一处进行横向切片。通过通用测试机进行推出测试，并使用单向方差分析和Duncan的事后检验进行统计分析。结果：对照组在所有根管三分之一处的结合强度均显著高于CNI组（P＜0.05）。在冠三分之一，sANP的结合强度低于PUI组（P＜0.05），sANP组在根尖三分之一处的结合强度与对照组相当（P>0.05），显著高于PUI组（P<0.05）。

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