Preparation of severely curved simulated root canals using engine-driven rotary and conventional hand instruments
| Autor: | Susanne Szep, W. Lüder, Detlef Heidemann, C. Leitzbach, T. Gerhardt |
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| Rok vydání: | 2001 |
| Předmět: |
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Anatomic medicine.medical_specialty Time Factors Materials science Surface Properties Instrumentation Pulpectomy Breakage Nickel otorhinolaryngologic diseases medicine Humans In vitro study General Dentistry Titanium Equipment Safety technology industry and agriculture Equipment Design Stainless Steel Surgery Torque Nickel titanium Fracture (geology) Equipment Failure Dental Pulp Cavity Root Canal Preparation Dental Alloys Biomedical engineering |
| Zdroj: | Clinical Oral Investigations. 5:17-25 |
| ISSN: | 1432-6981 |
| Popis: | This in vitro study evaluated the efficacy and safety of six different nickel-titanium engine-driven instruments used with a torque-controlled engine device and nickel-titanium hand and stainless steel hand instruments in preparation of curved canals. A total of 80 curved (36 degrees) simulated root canals were prepared. Images before and after were superimposed, and instrumentation areas were observed. Time of instrumentation, instrument failure, change in working length and weight loss were also recorded. Results show that stainless steel hand instruments cause significantly less transportation towards the inner wall of the canal than do nickel-titanium hand instruments. No instrument fracture occurred with hand instruments, but 30-60% breakage of instruments was recorded during instrumentation with the engine-driven devices. The working length was maintained by all types of instruments. Newly developed nickel-titanium rotary files were not able to prevent straightening of the severely curved canals when a torque-controlled engine-driven device was used. |
| Databáze: | OpenAIRE |
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