Influence of water/powder ratio in the mineral and synthetic casts
Tavarez, Rudys Rodolfo De Jesus; Klug, Rufino José; Vieira, Mayana Soares; Bezerra, Gisele Lima; Bandeca, Matheus Coelho; Firoozmand, Leily Macedo.
Braz. j. oral sci
; 13(3): 225-228, Jul-Sep/2014. tab, graf
Artigo
em Inglês
| LILACS | ID: lil-725355
AIM:
To evaluate the influence of varying the water/powder ratio on the compressive strength of type IV mineral and synthetic casts.METHODS:
Four commercial brands of type IV mineral and synthetic casts were evaluated Durone, Herostone, Fuji Rock, and Elite Rock. Ninety-six test samples were prepared from a silicone matrix, according to ADA's standard no. 25. The samples were prepared according to the manufacturer's recommendations with a normal water/powder ratio (n = 12) and with 20% extra water (n = 12), forming the control (A) and experimental (B) subgroups, respectively. Compressive strength tests were performed using a universal testing machine EMIC (DL 2000) with a load cell of 2,000 kgf/cm2. The obtained data were analyzed statistically using two-way ANOVA and Tukey's test (α=5%).RESULTS:
The synthetic Elite Rock cast was statistically different from the one obtained when the portion of water indicated by the manufacturer was used; no significant differences were found in the remaining casts when the proportion of water was increased by 20%.CONCLUSIONS:
the groups of synthetic and mineral casts differed and the water increase (20%) did not cause significant difference on the compressive strength of the materials...
Biblioteca responsável:
BR218.1
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