Keywords
gypsum
ISO
dentures
How to Cite
Abstract
Comparative evaluation of physical and mechanical properties of dental gypsum as auxiliary material during orthopedic treatment of dental patients with clinically-oriented view of production technology will improve the quality of dentures . Gypsum is the most accessible auxiliary materials in prosthetic dentistry, and even indispensable, since the vast majority of dental prostheses made it to gypsum models in plaster press form.
Comparative assessment of the quality of different types of plaster certified carried out in accordance with the requirements of international standard ISO-6873 accredited laboratory in pre-clinical testing of dental materials and products of JSC« Stoma» (Kharkiv). For comparison were taken following brands plaster «GW-G-10-III», «Base Stone», «GC Fudjirok EP».
In terms of the ratio of hydrophilic materials meet all requirements of ISO-6873. In terms of «total work time» all the studied materials on 25–60% higher than the indicative value of ISO-6873 that can provide leisurely work. Time structuring all samples plaster for casting the combined collapsible working models of the jaws is within the respective indicative value, the relative expansion in the structuring of all the studied materials at 20–70% below the indicative values relative expansion after plaster structuring all samples within the indicative values of ISO-6873. As revealed by the analysis of these laboratory tests, compression strength material samples to 15–60% higher than the ISO6873 and the most important «GC Fudjirok EP» – (32,0±2,1) MPa, the following meanings – «Base Stone»(28,5±1,5) MPa, and the lowest is «GW-G-10-III»- 23,0±0,8 MPa.
It is proved that the studied species gypsum have very different physical and mechanical properties that can not affect the quality of dentures made on plaster models.
Keywords: physical and mechanical properties, gypsum, ISO, dentures.
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