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Comparative Evaluation and Correlation of Marginal Fit and Retention of Metal Copings Fabricated Using Two Different Designs of Die Spacer– An In Vitro Study

Komal C. Dave*, Asha M. Rathod, Gaurang Mistry, Omkar Shetty

Introduction: The art and science of fixed prosthodontics is predicted on accomplishing precise and clinically accurate operative techniques based on sound biological and mechanical principles. Many factors have been demonstrated to influence the marginal seating and retention of crowns, such as size and shape of the prepared teeth, manipulation of the cement, retentive properties of the cement, cement film thickness, relieving space or venting for cement, cement application, and roughness of the dentinal surface. Optimum retention form is considered to be one of the most important principles of tooth preparation. The longevity of fixed prosthesis depends on the retention and marginal integrity of restoration. This study was done to evaluate, compare and correlate the marginal fit and retention for two different designs of die spacer.

Materials and Method: The samples to be studied were divided into 2 groups of 15 each. Each having a different die spacer design.

Results: The results showed no significant difference in marginal fit of group Ia and group IIa and retention was better in group IIb compared to group Ib. But no statistically significant differences were seen when correlating the marginal fit and retention between group Ia, group Ib and group IIa and group IIb.