Influence of different water types on the physical and mechanical properties of gypsum

Brazilian Journal of Oral Sciences

Juliana Dos Santos Proença¹  Marcos Massahiro Suzuki¹  Silvano Cesar Da Costa¹  Bruno Shindi Hirata¹  Murilo Baena Lopes¹  Edwin Fernando Ruiz Contreras¹ 

关键词: calcium sulfate;    water;    compressive strength;    dental prosthesis;   

DOI  :  10.1590/1677-3225v14n3a05

来源: SciELO

【 摘 要 】

AbstractAim: To evaluate if gypsum mixed with different water types, with their different compositions influence the dimensional change, surface roughness and compressive strength of type IV and V gypsum specimens.Methods: Sixty specimens were fabricated from metal matrices and divided into six groups (n=10) according to the used type of gypsum and water: G1, G2 and G3 - type IV gypsum and tap, mineral and distilled water, respectively; G4, G5 and G6 - type V gypsum and tap, mineral and distilled water, respectively. Water/powder ratio followed the manufacturer's recommendations (19 mL/100 g) in all groups. The same specimens were used for all tests. A micrometer dial evaluated the dimensional change. The surface roughness of three random points was determined with a rugosimeter; a universal testing machine performed the compressive strength test. The data were subjected to analysis of variance (ANOVA).Results: There was no statistically significant difference (p>0.05) between the three types of water in the studied variables. There was statistically significant difference (p<0.05) between the gypsum mixes for the dimensional change variable.Conclusions: The different water types, with their different compositions, did not influence the analyzed physical and mechanical properties.

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