Abstract:

BACKGROUND: The dimensional accuracy of impression is closely related with the suitability of final prosthesis.
OBJECTIVE: To evaluate the linear dimensional accuracy of dental casts made with one-step or two-step polyvinyl siloxanes impression techniques.
METHODS: One-step or two-step polyvinyl siloxanes impression techniques were used respectively to make 10 dental impressions of standard dental cast in an environment with temperature and humidity similar to clinical oral cavity. Cast was made on each impression using ultrahard plaster. The length, width, height of each cast was measured by vernier caliper.
RESULTS AND CONCLUSION: The cast measurements obtained by two-step polyvinyl siloxanes impression techniques were closer to the standard cast measurements than one-step impression techniques. But the measurements difference between different impression techniques and standard cast had no statistical significance.