Context: Space available gingival retraction is 0.3–0.4mm. However, after 40s, only 0.2mm of it is available. This is a concern when multiple impressions have to be made.

Aim:To compare the effect of impression margin thickness made using poly vinyl siloxane(PVS) and vinyl siloxane ether(VSE) on the linear accuracy of impressions and stone dies.

Methodology: A stainless–steel die was prepared with a square cavity in the centre with spaces of 4 varying widths. Ten impressions were made using VSE and PVS each and stone dies were poured.The accuracy of impressions and stone dies was measured.

Results: Impressions with thin margin of 0.1 mm showed maximum distortion and the same was with the dies. One–way ANOVA for PVS showed significant difference (P<0.05) while with VSE showed highly significant difference (P<0.001).

Conclusion: Theoverall accuracy of PVS was found to be high and can be the preferred material of choice.