Zmener O, Balbachan L
Department of Oral Pathology, University of Buenos Aires, Argentina.
Endod Dent Traumatol. 1995 Jun;11(3):121-3. doi: 10.1111/j.1600-9657.1995.tb00472.x.
In this study, the effect of 2 different endodontic files on the final shape of curved root canals of extracted single rooted teeth were examined in the scanning electron microscope. The instruments tested were a newly designed nickel-titanium endodontic file and a conventional K-type file. The files were used with in and out linear movements with a circumferential motion starting with a size 15 file. Final preparation of the apical thirds of the canals was performed with a size 35 file. Shaping effectiveness of the tested instruments was evaluated in terms of respect for conservation of the apical constriction and the presence or absence of ledging. Our observations revealed that more centered and tapered preparations were obtained with the use of the nickel-titanium files than with the conventional K-type files.
在本研究中，在扫描电子显微镜下检查了2种不同的根管锉对拔除的单根牙弯曲根管最终形态的影响。测试的器械是一种新设计的镍钛根管锉和一种传统的K型锉。锉的使用采用进出直线运动并辅以圆周运动，从15号锉开始。根管根尖三分之一的最终预备使用35号锉完成。根据对根尖狭窄的保留情况以及是否存在台阶来评估测试器械的成形效果。我们的观察结果显示，与传统的K型锉相比，使用镍钛锉能获得更居中且呈锥形的预备形态。
