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Fifteen-year recall period on zirconia-based single crowns and fixed dental prostheses. A prospective observational
Shahnawaz Khijmatgar1, Margherita Tumedei1,2, Guilia Tartaglia2
1Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
Aim:
The aim of this study was to evaluate the long-term clinical outcomes of zirconia-based prostheses used for tooth-supported or implant-supported single crowns and fixed dental prostheses (FPD).
Methods:
The authors conducted a prospective analysis of 562 zirconia core restorations supported by endodontically treated teeth or titanium implant in 276 patients in a general dental private practice, with a follow-up period of 15 years. The study was stopped after patients achieved 15 yrs of follow-up. The study analyzed the failure and complication rates of single and multiple crowns, based on Kaplan Meier analysis.
Results:
During follow-up period, there were 26 complications and 156 failures. The crown level analysis revealed a cumulative failure rate of 28.33% and complication rate of 8.47% for zirconia crowns after 15 years. The complication rate was found to be higher for titanium implant-supported than for natural teeth-supported crowns. The different types of crown-based failure include: veener fracture 5.01% (N = 29), metal zirconia led to 14.85% (N = 86) loss of retention, and 1.73% (N = 10) loss of crown due to extraction.
Conclusion:
Based on these findings, zirconia core restorations appear to be a reliable long-term solution for crowns and fixed dental prostheses.
Clinical Relevance:
The study suggests that zirconia restorations can be successfully used for long-term prostheses on natural teeth or implants supported. The study results provide clinicians valuable information when selecting prosthetic restorations material.
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