Bou Dagher F E, Yared G M
Department of Oral Fundamental Sciences, School of Dental Surgery, Lebanese University (section II), Lebanon.
J Endod. 1995 May;21(5):264-5. doi: 10.1016/s0099-2399(06)80994-5.
Flex-R, Ultra-Flex (Ni-Ti construction), and K-type files were compared using a circumferential filing technique on 96 extracted human maxillary molars. Buccal canals with minimal initial curvature of 24 degrees were used. The maximal initial curvature was 52 degrees. Canal curvature was measured before and after filling, and changes were analyzed statistically. The angle of curvature was better maintained with the Flex-R and Ultra-Flex files.
使用圆周锉磨技术，在96颗拔除的人类上颌磨牙上对Flex-R锉、超弹性（镍钛结构）锉和K型锉进行了比较。使用初始曲率最小为24度的颊侧根管。最大初始曲率为52度。在充填前后测量根管曲率，并对变化进行统计学分析。Flex-R锉和超弹性锉能更好地保持曲率角度。
