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CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0043-1777350
Original Article

Zirconia CAD-CAM Crowns Behavior after Intraoral Digital Impression in Normal versus Dysfunctional Patients: 3 Years Retrospective Study

Francesco Ferrini
1   Department of Dentistry, IRCCS Ospedale San Raffaele, Milan, Italy
,
Francesco Gianfreda 
2   Department of System Medicine University of Rome “Tor Vergata”, Rome, Italy
,
Francesco Bova
3   Centro di igiene orale e prevenzione, Department of Dentistry, IRCCS Ospedale San Raffaele, Milan, Italy
,
Francesca Cattoni
1   Department of Dentistry, IRCCS Ospedale San Raffaele, Milan, Italy
,
Patrizio Bollero
2   Department of System Medicine University of Rome “Tor Vergata”, Rome, Italy
,
Enrico Gherlone
1   Department of Dentistry, IRCCS Ospedale San Raffaele, Milan, Italy
,
Filiberto Mastrangelo
4   Clinical and Experimental Medicine Department, University of Foggia, Foggia, Italy
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Abstract

Objectives The aim of this study was to evaluate the clinical performance and possible complications of single zirconia crowns fabricated using an intraoral digital computer-aided design-computer-aided manufacturing (CAD-CAM) protocol in normal and dysfunctional patients after 3 years of follow-up.

Materials and Methods Seventy patients were included in this study. The teeth were prepared with a knife-edge marginal design, and temporary crowns were placed. Digital impressions were taken using optical scanning, and the frameworks were milled using the same technology. The veneering process was performed by the same dental technician. The occlusal corrections were made before cementation. The outcomes were evaluated in terms of survival, failures, and complications. The marginal adaptation of the crowns was also assessed.

Results The digital protocol for single zirconia crowns resulted in satisfactory outcomes, with high rates of survival and minimal complications after 3 years of follow-up. The marginal adaptation of the crowns was excellent, with 93% of the restorations achieving the ideal marginal adaptation, while 7% had minor deviations. Parafunctions were found in 41.9% of the prosthetic rehabilitation, but no significant differences were observed between the normal and dysfunctional groups regarding the survival and complications of the crowns.

Conclusion The digital protocol for single zirconia crowns is a reliable and predictable treatment option, even for patients with parafunction, when proper occlusal corrections are performed before cementation. The use of intraoral digital CAD-CAM technologies with optical impressions can simplify procedures, reduce the workflow time, and minimize the variables linked to the human factor.

Keywords

digital CAD-CAM - zirconia crowns - marginal adaptation - dental prosthesis - parafunctions


Publication History

Article published online:
08 February 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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