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Background : While literature demonstrates that the optimum accuracy is obtained with the custom trays, the use of stock trays for elastomeric impressions appears to be popular in general practice. Objective : This in vitro study was done to evaluate the linear dimensional accuracy of impression made in stock trays and custom trays, using polyvinyl siloxanes. Material and Methods : The different impressions technique of polyvinyl siloxanes utilized in this study are as follows: 1) Putty wash 2-step technique with polyethylene spacer using stock tray. 2) Single mix technique utilizing medium viscosity in a custom tray. 3) Multiple mix technique utilizing heavy viscosity and low viscosity combination in a custom tray. For each technique, 10 impressions of a maxillary dentulous metal master model were made. The accuracy was assessed by measuring the three dimensions on stone casts poured from impressions of the master model. Results : One-way analysis of variance showed statistically insignificant difference among the three different impression techniques for the different dimensions. Conclusion : Making custom tray is time consuming and costly; therefore putty wash 2-step technique with controlled bulk in stock tray can be used as an alternative to provide accurate impressions, as obtained from custom trays.

Comparison of custom trays and stock trays using polyvinylsiloxane to evaluate linear dimensional accuracy: An in vitro study