This study evaluated in vitro effectiveness of 17% EDTA with and without ultrasonics on smear layer removal. One hundred and five extracted premolars randomly divided into seven groups were instrumented with different final irrigating protocols: group A (Sal3US), saline for 3 minutes with ultrasonics; groups B (Na3) and C (Na3US), 1% sodium hypochlorite for 3 minutes without and with ultrasonics, respectively; groups D (ED3) and E (ED3US), 17% EDTA for 3 minutes without and with ultrasonics, respectively; and groups F (ED1) and G (ED1US), 17% EDTA for 1 minute without and with ultrasonics, respectively. Specimens were examined under scanning electron microscope and scored for smear layer and debris removal. Statistical analysis showed that groups with EDTA and ultrasonic irrigation, groups E (ED3US) and G (ED1US), had significantly more specimens with complete smear layer and debris removal. There was no significant difference between groups E (ED3US) and G (ED1US). A 1-minute application of combined use of EDTA and ultrasonics is efficient for smear layer and debris removal in the apical region of the root canal.

译文

这项研究评估了17% EDTA在去除涂片层和不使用超声波的情况下的体外有效性。用不同的最终灌溉方案对一百零五个提取的前磨牙随机分为七组: A组 (Sal3US),用超声波生理盐水3分钟; B组 (Na3) 和C组 (Na3US),分别在不使用超声波和使用超声波的情况下1% 次氯酸钠3分钟; 组D (ED3) 和E (ED3US),分别在不使用超声波和使用超声波的情况下17% 3分钟的EDTA; 以及组F (ED1) 和G (ED1US),分别在不使用超声波和使用超声波的情况下17% 1分钟的EDTA。在扫描电子显微镜下检查标本,并对涂片层和碎屑去除进行评分。统计分析表明,使用EDTA和超声冲洗的E组 (ED3US) 和G组 (ED1US) 的标本明显更多,具有完整的涂抹层和碎屑去除。E组 (ED3US) 和G组 (ED1US) 之间无显著差异。EDTA和超声波的联合使用1分钟的应用对于根管顶端区域的涂抹层和碎屑去除是有效的。

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