Himel V T, Ahmed K M, Wood D M, Alhadainy H A
Division of Endodontics, University of Tennessee, Memphis, College of Dentistry, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1995 Feb;79(2):232-7. doi: 10.1016/s1079-2104(05)80289-6.
Eighty-one dental students instrumented two curved canals in acrylic blocks with the use of stainless steel files in one block and nitinol files in the other. Overlay tracings were made of photographs taken before and after instrumentation of the acrylic blocks and differences between the tracings were measured along the canal walls. The canals instrumented with nitinol files were shaped better than those instrumented with stainless steel files; working length was maintained more often without ledging the canal walls and with less zipping of the apical foramen.
81名牙科学生在丙烯酸树脂块中使用不锈钢锉在一个块中预备两条弯曲根管，在另一个块中使用镍钛锉。在丙烯酸树脂块预备前后拍摄照片，并制作重叠描图，沿着根管壁测量描图之间的差异。使用镍钛锉预备的根管比使用不锈钢锉预备的根管成形更好；工作长度更常得以保持，不会出现根管壁台阶形成，根尖孔的拉链样改变也更少。
