Journal of Medical Sciences1682-44741812-5727Asian Network for Scientific Information10.3923/jms.2007.1350.1353SabooniM.R. GhanbarzadehJ. 8200778The aim of this in vitro study was to evaluate the effect of three liquid
types including tap water, distilled water and slurry water on surface hardness
of type IV gypsum (GC Fuji Rock, Japan). For each studied groups, 10 dies were
produced according to the manufacturers instructions whereby gypsum powder
were mixed with three different liquids. Twenty four hours after producing the
dies, hardness measurement test was carried out by way of microvickers and using
the set (MATSUZAVA, MHT2, Japan) and penetration time of 5 sec and power of
25 g. The test was carried out on three points of each dies surface and
averages of hardness of dies were measured. The obtained data were evaluated
by using of one-way ANOVA test as well as Tukey test using SPSS program. Results
showed that the average of surface hardness between the three studied groups,
have significant statistical differences with each other (p<0.001). In the
range of this study, it was shown that distilled water and slurry water produced
the most and the least surface hardness when they mixed with gypsum type IV
respectively.]]>Abdelaziz, K.M., E.C. Combe and J.S. Hodges,200211234240Anusavice, K.J.,200311th Edn.,pp: 255-280pp: 255-280Craig, R.G., J.M. Powers and J.C. Wataha,20048th Edn.,Duke, P., B.K. Moore, S.P. Haug and C.J. Andres,200083466473Habib, G.H., S.E. Mohammed, G.P. Stewart and R. Weinberg,198349639646Harris, P.E., S. Hoyer, T.J. Lindquist and C.M. Stanford,2004923538Lindquist, T.J., C.M. Stanford and E. Knox,200390441446Phillips, R.W.,19919th Edn.,pp: 69-92pp: 69-92Powers, J.M. and R.L. Sakaguchi,200612th Edn.,pp: 313-332pp: 313-332Rosentiel, S.F., M.F. Land and J. Fujimoto,20064th Edn.,pp: 526-554pp: 526-554Sanda, M.E.E., E.C. Combf and A.A. Grant,198261808810Stewart, K.L., K.D. Ruda and W.A. Kuebker,19922nd Edn.,pp: 117-118pp: 117-118