Stady of the effects of molding massas on the casting properties of palladium alloy "PALLADIUM-UNY"

Abstract

Casting properties of a new domestic PALLADENT-UNI dental palladium-based alloy (Open Joint Stock Company Scientific and Industrial Complex “Supermetal” named after E.I. Rytvin) were investigated using three molding compositions, Yeti Expansion (Yeti Dental International GmbH, Germany), Presto Vest 2 (Siladent Dr .Bohme & Schops GmbH, Germany) and Silikan (Spofa Dental, Czech Republic) are among them. In addition, casting properties of PALLADENT-UNI and domestic palladium dental alloys (PALLADENT (Open Joint Stock Company Scientific and Industrial Complex “Supermetal” named after E.I.Rytvin) and VitIrii-P (Open Joint Stock Company “Vital-E”)) were comparatively studied; during the casting “Presto Vest 2” molding composition was applied. All the above mentioned palladium-based alloys are used mainlyfor the manufacture of metal-ceramic crowns and bridges. Using “Multicast Compact” casting machine (“DeguDent”, Germany) casting of the following alloy samples was carried out at 1280, 1320 and 1350°C: standard wax grid for partial dentures 10*20*0,3 mm with rectangular cells, wireframe model of a single metal-ceramic crown with a wall thickness of 0,3 mm, milled of burn-out plastic, and ash-free 20 mm long wires of 0,3, 0,2, 0,1 mm in diameter. On the basis of the research made, molding composition Presto Vest 2 was established to be optimum molding mass for casting dental structures made of PALLADENT-UNI alloy. Optimum casting temperature was found to be 1350°C, which provides high overflow (about 100%) of dental structures, minimum deadweight loss, and minimum linear mold shrinkage. Comparative evaluation of the technological properties of the new dental PALLADENT-UNI alloy and PALLADENT and VitIrii-P dental palladium alloys showed that PALLADENT-UNI alloy is not inferior to the prevalent dental alloys and has lower values of irretrievable losses.

Keywords

PALLADENT-UNI / PALLADENT / VitIrii-P / palladium / casting / properties / fluidity / molding compounds

References

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