Evaluation and comparison of dimensional accuracy of different elastomeric impression materials under dry and wet conditions at various time intervals
Purpose: The aim of the study was to compare dimensional accuracy of two hydrophilic poly vinyl siloxane(PVS) and two polyether (PE) impression materials at different time intervals under dry and wet conditions.
Materials and Methods: A total of 128 impressions were made from two hydrophilic PVS and two PE impression materials. Stainless steel metal dies as per American Dental Association (ADA) specification 19 were used. Impressions were made under dry and wet conditions. The lines present on the die and the lines copied were measured using measuring microscope.
Results: The mean dimensional change was -1.3%. Mean values for PVS and PE light body and medium body under dry and wet conditions at 30 minutes and 24 hours were negative indicating that the impressions were smaller than the standard die. The impressions were larger than the metal die for polyether when kept under wet condition for 30 minutes.
Conclusion: Moisture did not cause significant adverse effects on the dimensional accuracy of any of the tested materials and there was no significant difference between PVS and PE. Dimensional accuracy of all the four materials tested was within ADA standards.
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