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Three Materials for Monolithic Crowns on Zirconia Implants: 1-Year Results of a Randomized Clinical Trial
Purpose:
To compare the survival rate and the technical, esthetic, and biologic outcomes of three different materials for monolithic crowns on zirconia implants in a randomized clinical trial.
Materials And Methods:
A total of 44 patients were randomly divided into three groups and restored with monolithic implant-supported single crowns: zirconia (Zr), polymer-infiltrated ceramic (PIC), and polymer (P). Follow-up evaluations were conducted after 1 year. Clinical assessments included survival rates, modified United States Public Health Service (USPHS) scores, white esthetic scores (WES), plaque index (PI), bleeding on probing (BoP), and probing depth (PD).
Results:
After 1 year, survival rates for monolithic Zr and PIC crowns were 100%, while the P crown group showed a survival rate of 84.6%. At baseline, the PIC crowns achieved the highest USPHS scores; however, this group also showed a noticeable decline over time. The WES remained stable for the Zr but declined significantly for the other groups due to changes in surface texture. PIC exhibited a significant increase in plaque accumulation.
Conclusions:
Regarding the survival rate, no statistically significant differences were observed between the groups. However, a lower survival rate in the P crown group and superior surface stability in the Zr crowns were noted. Within the limitations of the small sample size and short follow-up period, Zr crowns may be recommended for the restoration of one-piece zirconia implants.
