Arruda Etienny da Silva, Sponchiado-Júnior Emílio Carlos, Pandolfo Mariana Travi, Fredson Márcio Acris de Carvalho, Roberi Garcia Lucas da Fonseca, Marques André Augusto Franco
School of Dentistry, Federal University of Amazonas, Manaus, Amazonas, Brazil.
Department of Dentistry, Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
Eur J Dent. 2019 Oct;13(4):613-618. doi: 10.1055/s-0039-3399407. Epub 2019 Dec 31.
To evaluate the apical transportation and centering ability promoted by reciprocating and continuous rotary systems after root canal filling removal.
After obturation, 40 mesial root canals of mandibular molars were distributed into four groups ( = 20) for filling material removal: PTU group-F2 instrument (25.08) of ProTaper Universal system; R25 group-R25 instrument (25.08) of Reciproc system; X2 group-X2 instrument (25.06) of ProTaper Next system and X3 group-X2 instrument (25.06) of ProTaper Next system, followed by X3 instrument (30.07). Cone-beam computed tomographic analysis was performed before and after filling material removal for acquisition of apical images. Apical transportation (AT) and its direction, and centering ability (CA), were assessed using the equations AT = (X1-X2)-(Y1-Y2) and CA = (X1-X2/Y1-Y2 or Y1-Y2/X1-X2), respectively. Data were submitted to the nonparametric Kruskal-Wallis and Dunn multiple comparison tests ( < 0.05) for statistical analysis.
There was no statistically significant difference among groups for AT ( > 0.05), with a tendency toward transportation in the distal direction. Also, there was no statistically significant difference among groups regarding CA ( > 0.05).
The different systems, including ProTaper Next, caused AT within the acceptable clinical limit after filling removal. In addition, none of the tested systems presented adequate CA.
评估根管充填物取出后，往复式和连续旋转式系统促进根尖移位和根管居中的能力。
充填后，将40颗下颌磨牙的近中根管分为四组（每组n = 10）进行充填材料取出：PTU组——使用ProTaper Universal系统的F2器械（25.08）；R25组——使用Reciproc系统的R25器械（25.08）；X2组——使用ProTaper Next系统的X2器械（25.06），然后使用X3组——使用ProTaper Next系统的X2器械（25.06），随后使用X3器械（30.07）。在充填材料取出前后进行锥形束计算机断层扫描分析以获取根尖图像。分别使用公式AT = (X1 - X2)-(Y1 - Y2)和CA = (X1 - X2/Y1 - Y2或Y1 - Y2/X1 - X2)评估根尖移位（AT）及其方向和根管居中能力（CA）。数据采用非参数Kruskal-Wallis和Dunn多重比较检验（P < 0.05）进行统计分析。
各组间AT差异无统计学意义（P > 0.05），有向远中方向移位的趋势。此外，各组间CA差异也无统计学意义（P > 0.05）。
包括ProTaper Next在内的不同系统在充填物取出后导致的根尖移位在可接受的临床限度内。此外，所测试的系统均未表现出足够的根管居中能力。
