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ORIGINAL ARTICLE
Year : 2008  |  Volume : 8  |  Issue : 3  |  Page : 156-161

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


Department of Maxillofacial Prosthodontics and Implantology, HKE'S S. Nijalingappa Institute of Dental Sciences and Research, Gulbarga, Karnataka, India

Correspondence Address:
Padmakar S Patil
HKE'S S. Nijalingappa Institute of Dental Sciences and Research, Gulbarga -585 102, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.49021

Clinical trial registration None

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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.


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