Samar Al Saleh.
Some factors affecting surface quality of casts obtained from stabilized PVS impression material and modified stone.
J Pak Dent Assoc Jan ;13(3):125-9.

OBJECTIVE: To evaluate the surface porosity of a modified, disinfected, dental stone samples obtained from stabilized polyvinyl siloxane impression (PVS) material as affected by time of pouring and PVS impression material / dental stone combinations. MATERIALAND METHODS: Two PVS impression materials were used, where one was stabilized by platinum. Twenty impressions were made using each material. Those impressions were divided in to two groups, one group poured in five minutes, while the other group poured after forty five minutes. A dental stone and modified dental stone were used to pour the impressions. The resultant casts were examined for the presence of surface and internal voids. RESULTS: Casts produced from stabilized PVS, which were poured after five minutes, exhibited surface voids more than those produced from non-stabilized PVS poured at the same time interval. CONCLUSION: For the stabilized PVS impression material used in this study, five minutes were not enough to eliminate the surface voids. Using modified dental stone did not affect the surface porosity.

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