Barbosa Machado André Luiz, Machado André Guimarães, Silveira Bueno Carlos Eduardo
Dental Research Center, São Leopoldo Mandic University, Brazil.
Dental Research Center, Estácio Juiz de Fora University Center, Brazil.
Iran Endod J. 2019 Spring;14(2):133-138. doi: 10.22037/iej.v14i2.22758.
This study evaluated the occurrence of morphological changes on the surface of the instruments WaveOne™ and Reciproc when used in the preparation of simulated curved canals with and without glide path (generated with the Pathfile™ system), after the first, second, and third uses.
Sixty-four resin blocks, which simulated curved root canals, were used and instrumented with a variety of instruments, grouped according to manufacturer and conditions of simulated canal preparation. Simulated canals were instrumented with WaveOne™ (GW1 group) and Reciproc (GR1 group) according to manufacturers' recommendations, respectively. In contrast, GW2 and GR2 groups' simulated canals were submitted for construction of glide path with the PathFile™ system before the use of WaveOne™ and Reciproc instruments, respectively. Each instrument was used three times; after each use, each instrument was analyzed by using scanning electron microscopy (cervical, middle, and apical thirds of the instrument) in order to characterize the occurrence of changes (fracture, twist, and crack). Data were described using means and standard deviations. We used generalized linear models to compare differences between factors (region, manufacturer, glide path, and number of uses). SPSS-15 software was used, with a significance level of 5%.
Without glide path, WaveOne™ instruments tended to fracture more frequently (=0.003), twist more frequently (=0.05), and crack more frequently (=0.022), with increasing use, with statistically significant differences. With glide path, both WaveOne™ and Reciproc instruments cracked less frequently (=0.001); Reciproc instruments did not exhibit superficial changes, such as fractures and/or twists.
In this study Reciproc instruments exhibited superior performance, compared with WaveOne™ instruments, particularly when glide path with the PathFile™ system was used; both instruments may be used, safely, three times to prepare curved canals.
本研究评估了WaveOne™和Reciproc器械在首次、第二次和第三次使用后，用于制备有或无引导通路（使用Pathfile™系统生成）的模拟弯曲根管时器械表面形态变化的发生情况。
使用64个模拟弯曲根管的树脂块，并用多种器械进行预备，根据制造商和模拟根管预备条件进行分组。模拟根管分别按照制造商的建议，用WaveOne™（GW1组）和Reciproc（GR1组）器械进行预备。相比之下，GW2组和GR2组的模拟根管分别在使用WaveOne™和Reciproc器械之前，先用PathFile™系统构建引导通路。每个器械使用三次；每次使用后，通过扫描电子显微镜（器械的颈部、中部和根尖三分之一处）对每个器械进行分析，以表征变化（断裂、扭转和裂纹）的发生情况。数据用均值和标准差进行描述。我们使用广义线性模型来比较各因素（区域、制造商、引导通路和使用次数）之间的差异。使用SPSS - 15软件，显著性水平为5%。
在没有引导通路的情况下，随着使用次数增加，WaveOne™器械更容易发生断裂（=0.003）、扭转（=0.05）和裂纹（=0.022），差异具有统计学意义。在有引导通路的情况下，WaveOne™和Reciproc器械发生裂纹的频率均较低（=0.001）；Reciproc器械未出现诸如断裂和/或扭转等表面变化。
在本研究中，与WaveOne™器械相比，Reciproc器械表现出更优异的性能，尤其是在使用PathFile™系统构建引导通路时；两种器械均可安全地用于预备弯曲根管三次。
