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Investigation of the Linear Thermal Expansion Coefficient of Four Different Types of Phosphat Investment Materials
Dragutin Komar
; Zavod za fiksnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Biserka Lazić
; Zavod za fiksnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Adnan Ćatović
; Zavod za fiksnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Tomislav Ivaniš
; Zavod za fiksnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Ivo Baučić
; Zavod za fiksnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
The fit alloy castings used in fixed prosthodontics is dependent on the physico-chemical features of the investment. The aim of this study was to investigate the polymorphic transformation phases constituting the investment materials by X-ray diffraction analysis on a Philips diffractometer. The coefficient of linear heat expansion for the investment materials studied was obtained using a Chevenard dilatometer. The study was performed on tour types o f investment
materials: Univest 1 P, Begoral, Politerm C and Zeusvest. The highest coefficient of heat expansion was recorder for the specimen o f Begoral (1.13 %), and the lowest for Politerm C (0.99 %). The Politerm C and Zeusvest materials were found to have almost dentical dilatometric characteristics. A large proportion o f low temperature portion o f quartz and crystobalit in the specimens o f Zeusvest and Politerm C investments was demonstrated by the analysis o f dijfractograms.
Ključne riječi
investment materials; dilatometric analysis; X-ray diffraction analysis
Hrčak ID:
98634
URI
Datum izdavanja:
15.9.1996.
Posjeta: 2.626 *