Zmener O, Marrero G
University of Buenos Aires, Argentina.
Endod Dent Traumatol. 1992 Jun;8(3):99-103. doi: 10.1111/j.1600-9657.1992.tb00444.x.
In this study, the effect of using four endodontic files from different manufacturers on the final shape of 80 prepared curved root canals of extracted single-rooted teeth were comparatively analyzed with scanning electron microscopy. The instruments tested were Tri-files, Flex-R files, Flexofiles and conventional K-type files. All 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 was performed with a size 30 file. Shaping effectiveness of the tested files was qualitatively evaluated in terms of respect for conservation of the apical constriction and the presence or absence of ledging, specially in the apical third of the root canals. A well-centered and tapered preparation without apical transportation or ledging was detected when Tri-file or Flex-R files were used. Conversely, the use of Flexofile or conventional K-type files resulted in frequent alteration of the initial pattern of the root canals, showing an hour-glass preparation with alteration of the apical constriction and ledge formations.
在本研究中，使用扫描电子显微镜对来自不同制造商的四种根管锉对80颗拔除的单根牙预备弯曲根管最终形态的影响进行了比较分析。测试的器械为Tri-files、Flex-R锉、Flexofiles和传统K型锉。所有锉均采用进出直线运动并辅以圆周运动，从15号锉开始。根尖三分之一的最终预备使用30号锉。根据对根尖狭窄的保留情况以及是否存在台阶，特别是在根管根尖三分之一处，对测试锉的成形效果进行定性评估。使用Tri-file或Flex-R锉时，检测到根管预备良好居中且呈锥形，无根尖移位或台阶。相反，使用Flexofile或传统K型锉会导致根管初始形态频繁改变，呈现出根尖狭窄改变和台阶形成的沙漏形预备。
