We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The Effect of Steam Sterilization on Cyclic Fatigue of Stainless Steel Files.
- Authors
ZHAO Borui; HU Xin; WU Hui; CHEN Zhen; LI Changyi
- Abstract
Objective Comparing the effects of steam sterilization on cyclic fatigue of stainless steel files. Methods Fifty instruments of 25# stainless steel K files were randomly divided into 5 groups, which include 10 in each group. Group 1 was the blank control group, group 2 to 5 were subjected to 1, 3, 4, 5 steam sterilization cycles, then the files were tested by a custom-made device to assess cyclic fatigue and the number of cycles of failure (NCF) was calculated. Microstructure of each file's fracture surface was analyzed by Scanning Electron microscope (SEM). Results NCF in the 5 groups were 4 345.2±384.2, 3 937.9±645.4, 3 812.9±532.5, 3 626.2±380.0, 3 625.9±565.6 respectively, and the differences among 5 groups were significantly different (F=2.598, P < 0.05) . After 4 or 5 times of steam sterilization, cyclic fatigue decreased if compared with that in control group (P < 0.05). Fracture surface in group 1 and group 2 was tough dimple structure and large numbers of regular, deep dimples were distributed on the surface. You could also see micro cavities clearly formed by fracture; Fracture surface in group 4 was dimple structure in brittle intergranular morphology. It is characterized by the presence of thin brittle precipitates, clean and smooth crystal interface, and a great sense of polyhedral stereo. Conclusion After 4 times of steam sterilization, cyclic fatigue strength of 25# stainless steel K files declined, which possessed the potential risk of fracture.
- Subjects
STEAM as a disinfectant; CYCLIC fatigue; STAINLESS steel; ROOT canal treatment; DENTAL equipment -- Sterilization
- Publication
Tianjin Medical Journal, 2014, Vol 42, Issue 10, p1037
- ISSN
0253-9896
- Publication type
Article
- DOI
10.3969/j.issn.0253-9896.2014.10.022