THERMIC TREATMENTS INFLUENCE ON THE STRUCTURE AND PROPERTIES OF DENTAL ALLOYS

Monica Tatarciuc, Diana Diaconu Popa, Odette Luca, Anca Vitalariu

ABSTRACT:

The fixed prosthetic rehabilitations represent a current treatment solution, due to their advantages: high mechanical resistance, optimal aesthetic aspect, good clinical longevity, excellent, biocompatibility. The modification of some technological parameters influences the internal microstructure of dental alloys and, implicitly, the mechanical properties of the metallic dental bridges .The paper aims to investigate the influence and practical importance of the technological factors in designing and creating the metallic infrastructures by pouring: studies have been made in order to highlight the role of the heat source, during the melting, on the microstructure of the alloys and, implicitly, the effects exerted upon the oral tissues. In our study we used three alloys: Brealloy C+B 270 (Bredent), Heraenium P (Kulzer), Remanium 2001 (Dentaurum). We tested the hardness of the pouring raw samples and of the structures obtained after the thermal optimization treatments. The melting, pouring and slow cooling often lead to non-homogeneous prosthetic parts, with modified mechanical properties, important to the poured part. Since the raw structure after the pouring is not convenient to provide the desired features, thermal treatments are necessary to achieve a harmonious blend of physical, mechanical, chemical and biological properties

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