COMPARATIVE EVALUATION OF SURFACE DETAIL REPRODUCTION AND EFFECT OF DISINFECTANT AND LONG-TERM STORAGE ON DIMENSIONAL STABILITY OF VINYLPOLYETHERSILICONE WITH POLYVINYLSILOXANE AND POLYETHER IMPRESSION MATERIALS- IN-VITRO STUDY

Objectives: To compare and evaluate the surface detail reproduction and effect of disinfectant and long-term storage for 2 weeks on the dimensional stability of hybrid material Vinyl polyether silicone (VPES) with its parent Polyvinyl siloxane (PVS) and Polyether (PE) impression materials. Methods: All the samples were divided into three groups: Group A- VPES-D, VPES-N; Group B- PVS-D, PVS-N; Group C- PE-D, PE-N. 40 impressions of each material were made according to ADA/ANSI specification no.19 and twenty impressions of each material were disinfected using 2.45% glutaraldehyde solution. Surface quality measurements were made soon after disinfection using stereo-microscope. Dimensional stability measurements were made using measuring microscope immediately after disinfection and were repeated on the same samples after 7 and 14 days of storage. Data were analysed using chi-square test, One-way Anova test followed by Post hoc Tukey?s test. Results: The non-disinfected groups showed greater mean dimensional change values compared to disinfected groups. VPES-D showed the least dimensional changes and the dimensional stability of all the materials were within 0.5% range after prolonged storage for 14 days except for the PE-N which showed greater dimensional change percentage on 14th day of storage.VPES-D and PE-D produced better impressions with surface quality score 1 compared to PVS-D. Also, 18 samples of VPES-N and PE-N scored 1 and only 17 samples of PVS-N scored 1. Conclusion: The newer material VPES was observed to be both dimensionally stable and capable of producing good surface detail reproduction.