Kenee David M, Allemang John D, Johnson James D, Hellstein John, Nichol Brian K
Department of Endodontics, Naval Postgraduate Dental School, Bethesda, Maryland, USA.
J Endod. 2006 Jun;32(6):563-5. doi: 10.1016/j.joen.2005.10.065. Epub 2006 Apr 4.
This study evaluated the amount of calcium hydroxide [Ca(OH)(2))] remaining in canals after removal with various techniques including combinations of NaOCl with EDTA irrigation, hand filing, rotary instrumentation, or ultrasonics. The mesial canals of 12 mandibular molars were uniformly instrumented. Teeth were sectioned longitudinally along the length of the instrumented canals. Acrylic jigs were fabricated, allowing reapproximation of the opposing segments. After Ca(OH)2 placement into the canals, four techniques were used for its removal. In the first method, the master apical file was placed to working length in between two 5-ml rinses of NaOCl. The other three techniques combined with the first method either a 2.5-ml EDTA rinse, a rotary file (MAF size) to working length, or passive ultrasonication. Results showed that no technique removed all Ca(OH)2. Rotary and ultrasonic techniques, while not different from each other, removed significantly more Ca(OH)2 than irrigant only techniques. The irrigant only techniques were not different from each other.
本研究评估了采用多种技术（包括次氯酸钠与乙二胺四乙酸冲洗联合、手动锉、旋转器械或超声）去除根管内氢氧化钙[Ca(OH)₂]后的残留量。对12颗下颌磨牙的近中根管进行了统一预备。沿预备根管的长度方向将牙齿纵向剖开。制作丙烯酸夹具，以便将相对的部分重新对齐。将Ca(OH)₂放入根管后，采用四种技术进行去除。在第一种方法中，主尖锉置于工作长度，期间用两次5毫升的次氯酸钠冲洗。其他三种技术是在第一种方法的基础上，分别联合2.5毫升乙二胺四乙酸冲洗、一根旋转锉（主尖锉尺寸）至工作长度或被动超声。结果显示，没有一种技术能完全去除所有的Ca(OH)₂。旋转和超声技术虽然彼此之间没有差异，但去除的Ca(OH)₂明显多于仅使用冲洗液的技术。仅使用冲洗液的技术之间没有差异。
