Ghabraei Sholeh, Bolhari Behnam, Yaghoobnejad Fatemeh, Meraji Naghmeh
Department of Endodontics, Dental School, Tehran University of Medical Sciences, Tehran, Iran.
Private Practice, Tehran, Iran.
Iran Endod J. 2017 Spring;12(2):168-172. doi: 10.22037/iej.2017.33.
The aim of this study was to evaluate the effect of intra-canal calcium hydroxide (CH) remnants after ultrasonic irrigation and hand file removal on the push out bond strength of AH-26 and EndoSequence Bioceramic sealer (BC Sealer).
A total of 102 single-rooted extracted human teeth were used in this study. After root canal preparation up to 35/0.04 Mtwo rotary file, all the specimens received CH dressing except for 34 specimens in the control group. After 1 week, the specimens with CH were divided into 2 groups (=34) based on the CH removal technique; either with ultrasonic or with #35 hand file. Then specimens were divided into two subgroups according to the sealer used for root canal obturation: AH-26 or BC Sealer. After 7 days, 1 mm-thick disks were prepared from the middle portion of the specimens. The push out bond strength and failure mode were evaluated. Data were analyzed by the two-way ANOVA and Tukey's post hoc tests.
The push out bond strength of both sealers was lower in specimens receiving CH. These values were significantly higher when CH was removed by ultrasonic (<0.05). The dominant mode of failure in all subgroups was of mixed type except for the BC Sealer specimens undergoing CH removal with hand file which dominantly exhibited adhesive mode of failure.
CH remnants had a negative effect on the push out bond strength of AH-26 and BC Sealer. Ultrasonic irrigation was more effective in removing CH.
本研究旨在评估超声冲洗和手动锉去除后根管内氢氧化钙（CH）残留对AH-26和EndoSequence生物陶瓷封闭剂（BC封闭剂）推出粘结强度的影响。
本研究共使用了102颗单根拔除的人牙。在使用35/0.04 Mtwo旋转锉进行根管预备后，除对照组的34个标本外，所有标本均接受CH封药。1周后，根据CH去除技术将含CH的标本分为2组（每组34个）；分别采用超声或35号手动锉去除。然后根据用于根管充填的封闭剂将标本分为两个亚组：AH-26或BC封闭剂。7天后，从标本中部制备1mm厚的圆盘。评估推出粘结强度和失败模式。数据采用双向方差分析和Tukey事后检验进行分析。
接受CH的标本中，两种封闭剂的推出粘结强度均较低。当用超声去除CH时，这些值显著更高（P<0.05）。除了用手动锉去除CH的BC封闭剂标本主要表现为粘结失败模式外，所有亚组的主要失败模式均为混合型。
CH残留对AH-26和BC封闭剂的推出粘结强度有负面影响。超声冲洗在去除CH方面更有效。
