A Pilot Study on Storage Conditions Effect on Impression Materials

Objectives: The goal was to compare various physical and chemical properties of the elastomeric impression material stored in variable temperature and relative humidity levels according to ISO 4823:2015.
Methods: This project evaluated working time (WT), linear dimensional change (LDC), strain in compression (SIC), and elastic recovery (ER) at four different storage conditions (table 1) at the 0, 3, 6, 9,and 12 month time points.
Results: A sample size of n=6 was used for each time point for all properties tested. For WT at 0 and 3 months there was a statistically significant difference between the accelerated storage conditions and long-term storage condition (p = 0.001). For DR at timepoint 0, 6, 9, and 12 months no results were statistically significant. For ER at time points 0 and 3 months, no statistically significant differences were found. For 0 month there was a statistically significant difference in SIC between ambient and accelerated storage condition (p = 0.001); for 6 months no statistical differences were found.
Conclusions: The impression material passes the working time, elastic recovery, LDC, DR and strain in compression for all time points 0, 3, 6, 9, and 12 months, under varying storage conditions tests as mentioned in ISO guidelines.