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Vojnosanitetski pregled
2007, vol. 64, br. 4, str. 241-245
jezik rada: srpski
vrsta rada: originalan članak
doi:10.2298/VSP0704241M


Mehanička svojstva metal-keramičkih sistema nikl-hrom i kobalt-hrom legura
Vojnomedicinska akademija

Sažetak

Uvod/Cilj. Jačina metal-keramičkog međuspoja i modul elastičnosti legure jasno određuju potencijal njene primene, jer od te dve osobine zavisi očuvanje integriteta keramike u toku mastikacije. Istraživanje je sprovedeno sa ciljem da se utvrdi jačina metal-keramičkog međuspoja i modul elastičnosti legura kobalt-hrom u izradi metal-keramičkih zubnih nadoknada u odnosu na do sada najčešće korišćene legure nikl-hrom. Metode. Istraživanje je obavljeno po tipu eksperimentne studije. Izrađeno je po šest metal-keramičkih uzoraka legure nikl-hrom (Wiron99) i legure kobalt-hrom (Wirobond C) prema preporukama proizvođača i uputstvima datim u standardu ISO 9693: 1996. Korišćen je test savijanja sa opterećenjem u tri tačke do momenta loma keramike. Sila potrebna da dovede do loma keramike zabeležena je na univerzalnoj mašini za testiranje materijala (Zwick, tip 1464), koja se kretala brzinom od 0,05 mm/min. Rezultati. Rezultati ovog ispitivanja ukazali su na značajne razlike između jačine metal-keramičkog međuspoja (p < 0,01) i modula elastičnosti (p < 0,001) legura nikl-hrom i kobalt-hrom, pri čemu legure kobalt-hrom imaju veće vrednosti oba ispitivana parametra. Zaključak. Kobalt-hrom legure za metalkeramiku mogu uspešno zameniti nikl-hrom legure, naročito za izradu metal-keramičkih mostova velikog raspona, zbog velike otpornosti na savijanje.

Ključne reči

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