Abstract：
This study evaluated the effectiveness of three different irrigant activation techniques in cleaning and establishing patency during retreatment of root canals obturated with gutta-percha and bioceramic sealer. 60 extracted premolars with oval-shaped canals were instrumented and obturated with gutta-percha and EndosequenceBC sealer using the \'warm hydraulic condensation\' technique. The teeth were retreated using Protaper Universal Retreatment and XP-Endo Shaper system and divided into four groups according to the irrigant activation protocol used: control, passive ultrasonic irrigation (PUI), Endovac irrigation (EVI) and XP-Endo Finisher R (XPFR). Apical patency was achieved in all the samples of the XPFR group (100%), which showed a significantly higher success rate compared with the control (73.3%) and EVI groups (73.3%) (p < 0.05). The scanning electron microscopic evaluation revealed significantly cleaner middle and apical third root canals in the PUI and XPFR groups compared with the control group (p < 0.05). These findings suggest that XPFR effectively cleans and establishes patency in root canals filled with bioceramic sealers.
摘要：
这项研究评估了三种不同的冲洗剂活化技术在用牙胶和生物陶瓷密封剂封闭的根管再治疗过程中清洁和建立通畅性的有效性。使用“温暖的液压冷凝”技术，对60个带有椭圆形运河的提取的前磨牙进行仪器检测，并用gutta-percha和EndosequenceBC密封剂封闭。使用ProtaperUniversalRetreatment和XP-EndoShaper系统对牙齿进行了治疗，并根据所使用的冲洗剂激活方案将牙齿分为四组：对照，被动超声冲洗（PUI），Endovac灌溉（EVI）和XP-Endo修饰师R（XPFR）。XPFR组(100%)的所有样本均达到顶端通畅,与对照组（73.3％）和EVI组（73.3％）相比，成功率显着提高（p<0.05）。扫描电子显微镜评估显示，与对照组相比，PUI和XPFR组的中根和根尖第三根管明显更干净（p<0.05）。这些发现表明，XPFR可以有效地清洁并在充满生物陶瓷密封剂的根管中建立通畅性。
