Ten-Year Results of a Prospective Study on One-Piece Zirconia Oral Implants for Single-Tooth Reconstruction

Objectives: The intention of this 10-year prospective cohort investigation was to clinically and radiographically investigate the outcomes of a one-piece zirconia implant system for single-tooth replacement. Materials and Methods: A total of 65 patients received 66 single-tooth implants restored with all-ceramic crowns. Follow-up assessments were conducted at the time of prosthetic delivery, after 1, 3, 5, and 10 years. Peri-implant soft tissue parameters were evaluated. To assess peri-implant bone loss, standardized radiographs were taken at implant placement, prosthetic delivery, at the 1-, 3-, 5-, and 10-year follow-ups. Statistical analysis was conducted using linear mixed regression models and Wilcoxon Signed Rank tests to compare differences over time and between groups (p < 0.05). Results: Over the course of 10 years, 16 implants were lost, yielding a cumulative survival rate of 73.3%. Fifteen patients were lost to follow-up over the 10-year period. The average marginal bone loss of the remaining implants was 1.09 mm. Probing depth, attachment level, and bleeding showed an increase over time, while plaque index slightly decreased. Conclusions: Given the high implant loss rate after 10 years and the high occurrence of advanced bone loss observed in this study, the implant was not recommended for routine clinical use.