Fruchi Lincoln de Campos, Ordinola-Zapata Ronald, Cavenago Bruno Cavalini, Hungaro Duarte Marco Antonio, Bueno Carlos Eduardo da Silveira, De Martin Alexandre Sigrist
Postgraduate Program in Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil.
Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
J Endod. 2014 Jul;40(7):1000-4. doi: 10.1016/j.joen.2013.12.011. Epub 2014 Jan 17.
The aim of this study was to evaluate the efficacy of nickel-titanium reciprocating instrument techniques and passive ultrasonic irrigation (PUI) for retreatment in curved canals and obturated with correspondent single cones.
Twenty molars were selected with mesial-buccal canals with curvatures between 20° and 40°, and they were instrumented with a Reciproc R25 instrument (VDW, Munich, Germany) in a reciprocating motion and obturated with single cones and AH Plus sealer (Dentsply Maillefer, Ballaigues, Switzerland). The teeth were divided into 2 groups (n = 10) according to the instrument used for the removal of filling material: group 1: Reciproc R25 instrument and group 2: WaveOne Primary instrument (Dentsply Maillefer). The analysis of the remnant filling material was made through micro-computed tomographic imaging after the use of reciprocating instruments and again after the use of PUI with xylene. The effective time of retreatment was registered.
The filling material of the root canal was efficiently removed (P < .05) for both groups. The percentage of removal of filling materials was 93% for the Reciproc group and 92% for the WaveOne group. There were no statistical significant differences (P > .05) between the groups in relation to the removal of filling material ability and the time needed for the procedure. The effective time for the removal of filling material was 78.7 seconds and 89.5 seconds for the Reciproc and WaveOne groups, respectively.
It was concluded that both instruments efficiently but not completely removed the filling material from inside the root canals. The use of xylene with PUI increased the removal of filling material a little, but it was not statically significant.
本研究的目的是评估镍钛往复式器械技术和被动超声冲洗（PUI）在弯曲根管且用相应单锥充填的再治疗中的疗效。
选择20颗近中颊根管弯曲度在20°至40°之间的磨牙，用Reciproc R25器械（德国慕尼黑VDW公司）进行往复运动预备，并用单锥和AH Plus封闭剂（瑞士拜莱格Dentsply Maillefer公司）充填。根据用于去除充填材料的器械将牙齿分为2组（n = 10）：第1组：Reciproc R25器械；第2组：WaveOne Primary器械（瑞士拜莱格Dentsply Maillefer公司）。在使用往复式器械后以及使用二甲苯进行被动超声冲洗后，通过微计算机断层扫描成像对残留充填材料进行分析。记录再治疗的有效时间。
两组根管内的充填材料均被有效去除（P < 0.05）。Reciproc组充填材料的去除率为93%，WaveOne组为92%。两组在充填材料去除能力和操作所需时间方面无统计学显著差异（P > 0.05）。Reciproc组和WaveOne组去除充填材料的有效时间分别为78.7秒和89.5秒。
得出的结论是，两种器械均能有效但未完全去除根管内的充填材料。二甲苯联合被动超声冲洗使充填材料的去除略有增加，但无统计学意义。
