Andrade-Junior Carlos-Vieira, Neto Nilton-Dessaune, Rodrigues Renata-Costa-Val, Antunes Henrique-Dos Santos, Porpino Mariana-Teixeira-Maneschy, Carvalhal Júlio-Cesar A, Armada Luciana
PhD, Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, RJ, Brazil.
PhD, Department of Health, Dentistry Division, Southwest State University of Bahia, Jequié,BA, Brazil.
J Clin Exp Dent. 2017 Sep 1;9(9):e1136-e1140. doi: 10.4317/jced.54220. eCollection 2017 Sep.
This study compared the incidence of deviation along curved canals after preparation with two nickel-titanium (NiTi) rotary systems, Twisted File Adaptive and BT-RaCe.
Forty resin training blocks with curved canals were filled with ink and divided into two groups according to the instrumentation technique. Preinstrumentation images were acquired by using a stereomicroscope. The canals were up to an instrument #35/0.04. Postinstrumentation images were captured using the same conditions, and the images were superimposed. The amount of resin removed was measured at 8 different points, beginning at the apical terminus of the canal. Differences in the mesial and distal aspects were measured to evaluate the occurrence of deviation. The Student's-t test was used for comparison of the intragroup deviation. Intergroup analysis was performed by using one-way ANOVA for each level. For multiple comparisons, the Bonferroni test was used and a cutoff for significance was set at 5%.
Intragroup analysis showed that both instrumentation techniques promoted some deviation at all levels. BT-RaCe showed significantly lower deviation at 0 and 4-mm levels than Group Twisted File Adaptive (<0.05). On the other hand BT-RaCe showed worse performance at level 6.
The results of this study demonstrated that none of the NiTi tested systems was able to instrument curved canals simulated in resin blocks without some deviation during the preparation. There is still need for improvement in the instruments manufacturing aiming the better performance of endodontic files in curved root canals. BT-RaCe, Curved root canals, Deviation, Twisted File Adaptive.
本研究比较了两种镍钛（NiTi）旋转系统，即Twisted File Adaptive和BT-RaCe，在预备弯曲根管后根管偏移的发生率。
40个带有弯曲根管的树脂训练块充满墨水，并根据预备技术分为两组。使用体视显微镜获取预备前的图像。根管最大预备至35号/0.04器械。在相同条件下采集预备后的图像，并将图像叠加。从根管根尖末端开始，在8个不同点测量去除的树脂量。测量近中面和远中面的差异以评估偏移的发生情况。采用Student's-t检验比较组内偏移。通过对每个水平使用单因素方差分析进行组间分析。对于多重比较，使用Bonferroni检验，显著性临界值设定为5%。
组内分析表明，两种预备技术在所有水平均导致了一定程度的偏移。BT-RaCe在0和4毫米水平的偏移显著低于Twisted File Adaptive组（<0.05）。另一方面，BT-RaCe在6毫米水平表现较差。
本研究结果表明，所测试的镍钛系统在预备树脂块中模拟的弯曲根管时，均无法避免一定程度的偏移。为了使根管锉在弯曲根管中表现更好，器械制造仍需改进。BT-RaCe、弯曲根管、偏移、Twisted File Adaptive
