Leelapornpisid Warat, Sastraruji Thanapat, Louwakul Phumisak, Dewi Anat
Department of Restorative Dentistry and Periodontology, Division of Endodontics, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.
Dental Research Center, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.
Contemp Clin Dent. 2023 Apr-Jun;14(2):98-103. doi: 10.4103/ccd.ccd_583_21. Epub 2022 Nov 11.
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.
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 test.
The bond strength in the control group was significantly higher than the CNI group in all root canal thirds ( < 0.05). At coronal third, sANP showed lower bond strength than PUI group ( < 0.05). However, the bond strength of sANP group was comparable to the control group ( > 0.05) which was significantly higher than the PUI group at apical third ( < 0.05).
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.
本研究的目的是评估一种基于根尖负压概念制作的简单冲洗装置，作为氢氧化钙（CH）药物治疗后在椭圆形根管中作为最终冲洗方法对环氧树脂类封闭剂粘结强度的影响。
本研究纳入了48颗具有椭圆形根管的单根前磨牙。去除牙冠，用Mtwo（德国慕尼黑VDW有限公司）器械预备根管至40/04号。在CH药物治疗1周后，根据冲洗方案将标本分为四组：对照组（未用药）和三个试验组，分别为传统针头冲洗（CNI）、被动超声冲洗（PUI）和简单根尖负压套件（sANP）。采用基于环氧树脂的封闭剂通过热垂直加压技术对牙齿进行充填。1周后，将牙根在冠部、中部和根尖三分之一处横向切断。用万能试验机进行推出试验，并采用单因素方差分析和邓肯检验进行统计分析。
在所有根管三分之一处，对照组的粘结强度均显著高于CNI组（P<0.05）。在冠部三分之一处，sANP组的粘结强度低于PUI组（P<0.05）。然而，sANP组的粘结强度与对照组相当（P>0.05），而对照组在根尖三分之一处显著高于PUI组（P<0.05）。
sANP提高了椭圆形根管中经CH药物治疗的根管根尖三分之一处环氧树脂类封闭剂的粘结强度。
