Kobayashi C
Department of Endodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
J Endod. 1997 Jun;23(6):391-3. doi: 10.1016/S0099-2399(97)80190-2.
A technique using K files with modified tips has been developed for the penetration of constricted canals. The tip of a #10 K file was sliced diagonally to make it thinner. Because this modified K file has an especially fine tip and an appropriate stiffness, it followed constricted or sharply curved canals well and had a high penetration potential. The author attempted to penetrate to the apical foramen in all 1844 canals of 977 teeth treated from 1987 to 1994. In 263 canals (14.3%) that could not be penetrated with conventional #10 K files, further attempts were made with the modified K files. As a result, the number of the nonpenetrated canals was reduced to 75 (4.1%). There were 7 file breakages and 14 accidental perforations.
一种使用尖端改良的K锉的技术已被开发用于狭窄根管的疏通。将一根#10 K锉的尖端斜切使其变细。由于这种改良的K锉具有特别细的尖端和合适的刚度，它能很好地跟随狭窄或急剧弯曲的根管，并且具有较高的疏通潜力。作者试图对1987年至1994年治疗的977颗牙齿的1844个根管全部疏通至根尖孔。在263个（14.3%）用传统#10 K锉无法疏通的根管中，进一步尝试使用改良的K锉。结果，未疏通的根管数量减少到75个（4.1%）。发生了7次锉折断和14次意外穿孔。
