Ferreira Fabiano Guerra, Barbosa Igor Bastos, Scelza Pantaleo, Montagnana Marcello Bulhões, Russano Daniel, Neff John, Scelza Miriam Zaccaro
Universidade Federal Fluminense - UFF, Department of Endodontics, Niteroi, RJ, Brazil.
Taylor Hobson of Brazil, São Paulo, SP, Brazil.
Braz Oral Res. 2017 Sep 28;31:e74. doi: 10.1590/1807-3107BOR-2017.vol31.0074.
The aim of this study was to undertake a qualitative and quantitative assessment of nanoscale alterations and wear on the surfaces of nickel-titanium (NiTi) endodontic instruments, before and after use, through a high-resolution, noncontact, three-dimensional optical profiler, and to verify the accuracy of the evaluation method. Cutting blade surfaces of two different brands of NiTi endodontic instruments, Reciproc R25 (n = 5) and WaveOne Primary (n = 5), were examined and compared before and after two uses in simulated root canals made in clear resin blocks. The analyses were performed on three-dimensional images which were obtained from surface areas measuring 211 × 211 µm, located 3 mm from their tips. The quantitative evaluation of the samples was conducted before and after the first and second usage, by the recordings of three amplitude parameters. The data were subjected to statistical analysis at a 5% level of significance. The results revealed statistically significant increases in the surface wear of both instruments groups after the second use. The presence of irregularities was found on the surface topography of all the instruments, before and after use. Regardless of the evaluation stage, most of the defects were observed in the WaveOne instruments. The three-dimensional technique was suitable and effective for the accurate investigation of the same surfaces of the instruments in different periods of time.
本研究的目的是通过高分辨率、非接触式三维光学轮廓仪，对镍钛（NiTi）根管治疗器械使用前后表面的纳米级变化和磨损进行定性和定量评估，并验证评估方法的准确性。在由透明树脂块制成的模拟根管中使用两次前后，对两个不同品牌的NiTi根管治疗器械Reciproc R25（n = 5）和WaveOne Primary（n = 5）的切割刃表面进行检查和比较。分析是在从距其尖端3 mm处测量的211×211 µm表面积获得的三维图像上进行的。通过记录三个幅度参数，在第一次和第二次使用前后对样品进行定量评估。数据在5%的显著性水平上进行统计分析。结果显示，第二次使用后，两个器械组的表面磨损均有统计学意义的增加。在所有器械使用前后的表面形貌上均发现有不规则之处。无论评估阶段如何，WaveOne器械中观察到的缺陷最多。三维技术适用于并有效地准确研究器械在不同时间段的相同表面。
