Related Experiment Video
Updated: Jun 20, 2026
Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses
Published on: October 11, 2024
[Continuous observation of canal aberrations in S-shaped simulated root canal prepared by hand-used ProTaper files]
Ling-yun Xia1, Wei-dong Leng, Min Mao
1Department of Stomatology, Taihe Affiliated Hospital, Yunyang Medical College, Shiyan 442000, Hubei Province, China. xialingyun200810@163.com
Purpose:
To observe the formation of canal aberrations in S-shaped root canals prepared by every file of hand-used ProTaper.
Methods:
Fifteen S-shaped simulated resin root canals were selected. Each root canal was prepared by every file of hand-used ProTaper following the manufacturer instruction. The images of canals prepared by S1, S2, F1, F2 and F3 were taken and stored, which were divided into group S1, S2, F1, F2 and F3. One image of canal unprepared was superposed with the images of the same root canal in these five groups respectively to observe the types and number of canal aberrations, which included unprepared area, danger zone, ledge, elbow, zip and perforation. SPSS12.0 software pakage was used for Fisher's exact probabilities in 2x2 table.
Results:
Unprepared area decreased following preparation by every file of ProTaper, but it still existed when the canal preparation was finished. The incidence of danger zone, elbow and zip in group F1 was 15/15, 11/15, 4/15, respectively, which was significantly higher than that in group S2(2/15,0,0) (P<0.001). Ledge appeared after prepared by F2, and increased sharply in group F3. None perforation was found in all groups.
Conclusions:
The incidence of canal aberrations begins to increase after prepared by finishing files of ProTaper.The presence of unprepared area suggests that it is essential to rinse canal abundantly during complicated canal preparation and canal antisepsis after preparation.
