Mitchell B F, James G A, Nelson R C
Oral Surg Oral Med Oral Pathol. 1983 Feb;55(2):204-7. doi: 10.1016/0030-4220(83)90179-2.
This study evaluates the effect of cyclic autoclave sterilization and simulated clinical usage on a mechanical property of one brand of stainless steel endodontic files. The angular deflection moments were measured by a torque apparatus approved by the American Dental Association for such purposes. Comparisons of values for sterilized and nonsterilized files were made. 1. A significant decrease in angular deflection values exists for stainless steel endodontic files having undergone ten cycles of autoclave sterilization versus files having undergone only two or five similar cyclings. 2. All file sizes (15, 20, 25, 30, 35, 40) tested in torsion were detrimentally affected by the autoclave sterilization. 3. Of the files investigated, sizes 35 and 40 were the most adversely affected by the steam-under-pressure sterilization. 4. The angular deflection values of those files subjected to repeated autoclavings were not decreased below the minimum value accepted by the American Dental Association for resistance to torquing forces. It can therefore be concluded that repeated sterilization of a stainless steel endodontic file does result in a significant reduction in the torque resistance of that file. This reduction of the metal property is not significant clinically, however.
本研究评估了循环高压蒸汽灭菌和模拟临床使用对某一品牌不锈钢根管锉机械性能的影响。角偏矩由美国牙科协会批准用于此类目的的扭矩仪测量。对已灭菌和未灭菌锉的值进行了比较。1. 与仅经过两次或五次类似循环的不锈钢根管锉相比，经过十次高压蒸汽灭菌循环的不锈钢根管锉的角偏值显著降低。2. 所有测试的锉尺寸（15、20、25、30、35、40）在扭转时均受到高压蒸汽灭菌的不利影响。3. 在研究的锉中，35号和40号锉受压力蒸汽灭菌的影响最不利。4. 那些经过反复高压蒸汽灭菌的锉的角偏值未降低到美国牙科协会接受的抗扭矩力最小值以下。因此可以得出结论，不锈钢根管锉的反复灭菌确实会导致该锉的抗扭矩力显著降低。然而，这种金属性能的降低在临床上并不显著。
