Abstract：
To appraise the outcome of file systems and activation of the final irrigant on the push-out bond strength of root fillings in oval canals. Single-rooted mandibular premolars (n = 180) with oval canals were divided into three groups (n = 60) for instrumentation: ProTaper Next (PTN), WaveOne (WO), and Self-adjusting File (SAF). The specimens were further divided into subgroups (n = 20) and subjected to final irrigation with activation by EndoActivator or passive ultrasonic irrigation or without activation. Then, the specimens were again subdivided (n = 10) and obturated with gutta-percha and AH Plus (GP-AH) or C-Point with EndoSequence bioceramic sealer (C-EBC). One-millimeter-thick horizontal slices were cut from the apical third of the root, 5 mm from the apex, and subjected to push-out bond strength (BS) testing. Specimens for which SAF was used exhibited higher BS values than those for which PTN or WO was used (p < 0.05). Activation of the final irrigation did not affect the BS of the root fillings. Root fillings made of C-EBC presented a higher BS than those made of GP-AH (p < 0.05). Adhesive failure was more common with specimens instrumented using PTN and WO. Root canals instrumented with SAF, showed the highest bond strength values for both root filling materials. The C-EBC produced significantly higher bond strength values than those of the GP-AH.
摘要：
评价文件系统的结果和最终冲洗剂的激活对椭圆形运河根部填充物的推出粘结强度的影响。将具有椭圆形管的单根下颌前磨牙（n=180）分为三组（n=60）进行器械：ProTaperNext（PTN），WaveOne(WO),和自调整文件（SAF）。将标本进一步分为亚组（n=20），并通过EndoActivator激活或被动超声冲洗或不激活进行最终冲洗。然后，将标本再次细分（n=10），并用古塔胶和AHPlus（GP-AH）或用EndoSequence生物陶瓷密封剂（C-EBC）封闭。从根的顶端三分之一切下一毫米厚的水平切片，距顶点5毫米，并进行推出粘结强度（BS）测试。使用SAF的样品表现出比使用PTN或WO的样品更高的BS值(p<0.05)。最终灌溉的激活不会影响根填充物的BS。由C-EBC制成的根填充物的BS高于由GP-AH制成的根填充物（p<0.05）。在使用PTN和WO进行仪器测量的样品中，粘合剂失效更为常见。用SAF仪器安装的根管，显示两种根填充材料的粘结强度值最高。C-EBC产生的粘结强度值明显高于GP-AH。
