Conservative Dentistry Department, Federal University of Rio Grande do Sul, RS, Brazil.
Microsc Res Tech. 2013 May;76(5):496-502. doi: 10.1002/jemt.22192. Epub 2013 Mar 1.
This study sought to evaluate the efficacy of passive ultrasonic irrigation (PUI) on removing the smear layer and debris from root dentin using scanning electron microscopy (SEM). Twenty-five bovine incisors were manually prepared and divided into three groups according to the final irrigation protocol: EDTA, final irrigation with 12 mL of 17% EDTA for 3 minutes followed by 5 mL of 2.5% NaOCl; EDTA/PUI, final flush with 4 mL of 17% EDTA and PUI for 30 seconds. These procedures were repeated three times to standardize the volume of the irrigant. Control group, after preparation, the specimens were irrigated only with 17 mL of 2.5% NaOCl. The roots were fractured and analyzed using SEM. The intragroup analysis revealed that the EDTA/PUI protocol removed a higher amount of debris at the cervical third (P = 0.03). The intergroup analysis revealed that EDTA/PUI presented the lowest amount of debris at the cervical third (P = 0.007). Smear layer scores were higher in the control group compared with the EDTA and EDTA/PUI groups, but only at the cervical third (P = 0.02). None of the final irrigant protocols completely removed the smear layer and debris. EDTA/PUI only improved the removal of debris at the cervical third.
本研究旨在通过扫描电子显微镜 (SEM) 评估被动超声冲洗 (PUI) 去除根管玷污层和碎屑的效果。将 25 颗牛切牙进行手动制备，并根据最终冲洗方案分为三组：EDTA 组，用 12 mL 17% EDTA 冲洗 3 分钟，再用 5 mL 2.5% NaOCl 冲洗；EDTA/PUI 组，用 4 mL 17% EDTA 冲洗并进行 30 秒的 PUI，共重复三次以标准化冲洗剂的体积。对照组，在制备后，仅用 17 mL 2.5% NaOCl 冲洗标本。将根部分裂并使用 SEM 进行分析。组内分析显示，EDTA/PUI 方案在颈三分部去除的碎屑量更高 (P = 0.03)。组间分析显示，EDTA/PUI 方案在颈三分部的碎屑量最低 (P = 0.007)。与 EDTA 和 EDTA/PUI 组相比，对照组的玷污层评分在颈三分部更高，但仅在颈三分部 (P = 0.02)。没有任何最终冲洗方案能完全去除玷污层和碎屑。EDTA/PUI 仅改善了颈三分部的碎屑去除效果。
