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Marginal Accuracy of Monolithic and Veneered Zirconia Crowns


Now online in the Journal of Prosthodontics, an open access research article that compares the marginal accuracy of zirconia crowns fabricated by different workflows (conventional and digital) and designs (monolithic and veneered).

Zirconia dental prostheses have gained significant popularity in recent years due to esthetics, durability, biocompatibility, and the ease of application of digital technologies.

The drawback of monolithic zirconia prostheses is the lack of shade and shape customization. To mitigate this limitation, minimal veneering on the buccal surface of predominantly monolithic zirconia prosthesis can be applied to improve prosthesis esthetics. However, several studies have indicated that veneering may distort the coping and may introduce marginal discrepancies.

In this study, four workflow combinations were evaluated: (1) intraoral scanning and monolithic zirconia, (2) intraoral scanning and veneered zirconia, (3) conventional impression and monolithic zirconia, and (4) conventional impression and veneered zirconia. Ten crowns were produced in each workflow and vertical and horizontal marginal accuracies were measured with a traveling microscope.

All the evaluated workflows provided crowns of margins well below the acceptable marginal opening. Monolithic zirconia crowns fabricated digitally had superior marginal accuracy to monolithic zirconia crowns fabricated conventionally. Esthetic buccal veneering improved the vertical and horizontal marginal accuracies regardless of the type of physical casts.

Abduo J, Ho G, Centorame A, Chohan S, Park C, Abdouni R, et al. Marginal Accuracy of Monolithic and Veneered Zirconia Crowns Fabricated by Conventional and Digital Workflows. J Prosthodont. 2022; 1– 8. https://doi.org/10.1111/jopr.13618


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