the most accurate impression material for making impression of an oral cavity is:
a- impression compound.
b- condensation type silicon.
c- polyvinyl siloxanes. ***
d- poly sulfide.
the addition silicones are the best choice of the rubber impression materials
Addition curing silicones have the least amount of shrinkage on setting making them the most accurate class of rubber impression material .
The poly (vinylsiloxanes) are characterized by excellent dimensional accuracy and long-term dimensional stability.
