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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN: 1677-3225
Vol. 14, No. 3, 2015, pp. 199-203
Bioline Code: os15035
Full paper language: English
Document type: Research Article
Document available free of charge

Brazilian Journal of Oral Sciences, Vol. 14, No. 3, 2015, pp. 199-203

 en Influence of different water types on the physical and mechanical properties of gypsum
Proença, Juliana dos Santos; Suzuki, Marcos Massahiro; da Costa, Silvano Cesar; Hirata, Bruno Shindi; Lopes, Murilo Baena & Contreras, Edwin Fernando Ruiz

Abstract

Aim: 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.

Keywords
calcium sulfate; water; compressive strength; dental prosthesis

 
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