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ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use
Ya Shen1, Huimin Zhou2, Jeffrey M Coil3
1Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada; Department of Materials Engineering, University of British Columbia, Vancouver, British Columbia, Canada.
ProFile Vortex and Vortex Blue endodontic instruments show very low fracture risk in clinical use. Vortex Blue files exhibit distinct metallurgical properties compared to ProFile Vortex instruments.
Area of Science:
- Endodontics
- Materials Science
- Dental Materials
Background:
- Endodontic instruments undergo significant stress during clinical use.
- Understanding instrument failure modes and metallurgical changes is crucial for patient safety and treatment efficacy.
Purpose of the Study:
- To analyze defects in ProFile Vortex and Vortex Blue instruments after clinical use.
- To evaluate the impact of clinical use on the metallurgical properties of these instruments.
Main Methods:
- 330 ProFile Vortex and 1136 Vortex Blue instruments were collected post-clinical use.
- Instrument defects were analyzed; fractured files underwent scanning electron microscopy.
- Differential scanning calorimetry assessed metallurgical properties of unused and used instruments.
Main Results:
- ProFile Vortex instruments showed no fractures, but 6.1% had bent or blunt defects.
- Vortex Blue instruments had a low fracture rate (1.5%), with fractures due to shear stress at the spiral tip.
- Vortex Blue files displayed a unique 2-stage metallurgical transformation and lower austenite-finish temperatures than ProFile Vortex.
Conclusions:
- ProFile Vortex and Vortex Blue instruments have a very low fracture risk when discarded after use in a graduate endodontic program.
- Vortex Blue instruments possess distinct metallurgical behavior compared to ProFile Vortex instruments, indicating different material properties.
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