European Journal of Molecular & Clinical Medicine

Background: Accurate implant impressions play a significant role and serve as a starting
point in the process of producing good working casts. The present study was conducted to
assess accuracy of different materials used in impressions for fixed partial dentures.
Materials & Methods: It comprised of alginate, polysulphide, polyether and condensation
silicone impression material. Digital photographs of the master model and of the stone casts
were taken to evaluate the impression materials’ accuracy and the discrepancies between
them were measured.
Results: The mean discrepancies between the prepared tooth edges in the master model and
in the stone casts in group I was 0.32 mm, in group II was 0.18 mm, in group III was 0.14
mm and in group IV was 0.36 mm. The difference was significant (P< 0.05).
Conclusion: Different impression materials and techniques influenced the stone casts’
accuracy in a way that polyether, polysulfide and condensation silicone were more accurate
than the other materials