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Sławomir Gabryś
Streszczenie
Wprowadzenie. Celem badania była ocena wpływu temperatury na wyniki testu zmęczeniowego na zginanie pilników niklowo-tytanowych przeznaczonych do mechanicznego wytwarzania glide path.
Materiał i metody. Pięć rodzajów niklowo-tytanowych pilników endodontycznych przeznaczonych do mechanicznego wytwarzania glide path poddano testowi zmęczeniowemu na zginanie w dwóch temperaturach: 20 °C i 35 °C. Do testu wykorzystano po 20 pilników: Endostar EP Easy Path (Poldent), Easy Path bez obróbki cieplnej (Poldent), WaveOne Gold Glider (Dentsply Sirona), ProGlider (Dentsply Sirona) i R-Pilot (VDW). Narzędzia pracowały w zakrzywionym sztucznym kanale o długości 16 mm, kącie krzywizny 90 stopni i promieniu krzywizny 2,5 mm. Mierzono czas do złamania dla każdego pilnika oraz długość odłamanego fragmentu.
Wyniki. Zarówno w temperaturze 20 °C, jak i 35 °C najdłuższy średni czas do złamania miały narzędzia Endostar EP Easy Path, a najkrótszy średni czas do złamania – narzędzia ProGlider. Średni czas do złamania dla wszystkich narzędzi tego samego rodzaju był istotnie statystycznie krótszy w temperaturze 35 °C niż w 20 °C.
Wnioski. Wzrost temperatury, w jakiej przeprowadza się test zmęczeniowy, powoduje skrócenie czasu do złamania dla wszystkich testowanych pilników.
Abstract
Introduction. The purpose of this research was to assess the effect of temperature on the results of the cycling fatigue test of a nickel-titanium files dedicated to creating glide-path.
Methods and material. Five kinds of mechanical nickel-titanium files dedicated to creating glide-path were cycling-fatigue tested in two temperatures: 20 °C and 35 °C. Twenty files of each kind were used for the test: Endostar EP Easy Path (Poldent), Easy Path without heat treatment(Poldent), WaveOne Gold Glider (Dentsply Sirona), ProGlider (Dentsply Sirona), R-Pilot (VDW). The files operated in a curved artificial canal with the following dimensions: length: 16 mm, angle of curvature: 90 degrees, radius of curvature: 2,5 mm. Time to fracture and the length of broken fragment were measured.
Results. Both in the temperature of 20 °C and 35 °C, Endostar EP Easy Path files had the longest average time to fracture, ProGlider files had the shortest time to fracture. The average time to fracture for all the files of the same sort was statistically significantly shorter in the temperature 35 °C than in 20 °C.
Conclusions. The increase of temperature in which the cycling fatigue test is conducted shortens the time to fracture for all the tested files.
Hasła indeksowe: test zmęczeniowy, glide path, temperatura ciała
Key words: cycling fatigue test, glide path, body temperature
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