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Microscopic evaluation of three endodontic files pre- and postinstrumentation
I Bonetti Filho1, R Miranda Esberard, R de Toledo Leonardo
1Computing Resources Department, University of Texas Health Science Center at San Antonio 78284-7892, USA.
Journal of Endodontics
|August 7, 1998
Summary
Small stainless steel endodontic files should be discarded after one use. Nickel-titanium files showed no significant shape changes after five uses, suggesting longer durability for root canal instrumentation.
Area of Science:
- Endodontics
- Dental Materials Science
- Morphometry
Background:
- Endodontic file reusability is crucial for cost-effectiveness and safety.
- Understanding the morphometric changes in endodontic files after clinical use is essential for preventing procedural complications.
Purpose of the Study:
- To morphometrically evaluate K-type, Sureflex NiTi, and FlexoFiles after repeated root canal instrumentation.
- To determine the safe number of reuses for different types and sizes of endodontic files.
Main Methods:
- Stereomicroscopic evaluation at x40 magnification and photomicrography were used.
- Morphometric analysis of files after 1, 3, and 5 uses in maxillary premolar root canals.
- Statistical analysis of observed abnormalities.
Main Results:
- Small-sized stainless steel instruments showed abnormalities after one use.
- #30 stainless steel K-files and FlexoFiles were usable up to 3 and 5 times, respectively.
- Sureflex Nickel-Titanium (NiTi) files exhibited no significant shape abnormalities even after five uses.
Conclusions:
- Small-sized stainless steel endodontic files necessitate single use.
- Nickel-titanium instruments, specifically Sureflex NiTi files, demonstrate superior durability and shape integrity.
- Recommendations are provided for the safe and effective reuse of endodontic files based on material and size.