[Types of changes in laboratory technics used in prosthetic technology]

Because of the phenomena which were noticed in clinical and laboratory work of permanent stomatological metallographical and other researches of the consequences of free changed conditions in melting and cooling phase of dental alloy auropal were carried out. Modality of the changes during melting of this alloy in dental laboratory were systematically chosen according to noticed phenomena in praxis. Main objective was to metallographicly determine these phenomena during the process. With application of usual methods for setting of metallographical carved pie, samples were researched with metallographical microscope Epiryp 2 from Zeiss-jena, under different melting conditions and filmed with different enlargement. Even small changes of melting and cooling conditions are causing in microstructure and these are reflecting on the alloy characteristics. According to this melting procedure is a very sensitive and complex problem in termical laboratory processing which demands maximum attention an strict following fabrical instructions in order to avoid unwanted consequences in clinical application.