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Purpose of study: The purpose of this study is to analyze the effect of die spacer on retention of full coverage crowns. The success of a full cast crown restoration depends on the marginal fit and the retention of the restoration. The application of die spacer helps to improve the fit of the crown, but its effect on postcementation retention has been a subject of controversy. The present study was undertaken to compare the retentive force required to dislodge the unspaced and spaced crowns.  Methodology: Twenty-five freshly extracted molar teeth were prepared and two stone dies were prepared for each tooth. One die from each pair was coated with four layers of die spacer. A pair of castings was obtained for each tooth. Force required to dislodge the cemented castings was measured using a constant displacement-rate-testing machine.  Conclusion: Die spacer reduces the retention of the castings. Die spacing must be used carefully to maximize its potential and eliminate the loss of retention.

the journal of indian prosthodontic society

A comparative study on the retention of full coverage cast crowns cemented with zinc phosphate cement with and without die relief agent on prepared human teeth