Five- to Nine-Year Clinical and Radiographic Performance of Morse-Tapered Hybrid Dental Implants: A Retrospective Observational Study

Background/Objectives: The long-term clinical performance of Morse-tapered hybrid dental implants remains insufficiently documented. This retrospective cohort study evaluated implant, prosthesis, and abutment survival, marginal bone loss (MBL), and the influence of implant- and patient-related variables over a follow-up period of up to 108 months. Methods: Patients who received Morse-tapered hybrid dental implants between 2017 and 2020 and had at least 5 years of follow-up were retrospectively evaluated. Implant, prosthesis, and abutment survival, as well as radiographic MBL, were assessed. MBL was determined using standardized periapical radiographs obtained from baseline to 108 months. Kaplan–Meier survival analysis and log-rank tests were used to evaluate survival outcomes, whereas longitudinal MBL was analyzed using linear mixed-effects models accounting for clustering at the patient level. Results: A total of 367 Helix GM® implants placed in 79 patients (mean age: 53.5 ± 13.4 years) were included, with follow-up ranging from 60 to 108 months. Cumulative implant survival was 99.2% at 108 months, with all implant failures occurring within the first year of function. Prosthesis survival ranged from 90.0% to 95.8%, and abutment survival ranged from 99.1% to 100%. Mean MBL remained below 1.0 mm throughout long-term follow-up. Implant survival and MBL were not significantly influenced by insertion torque, bone quality, loading protocol, or prosthetic rehabilitation design (p > 0.05). Smoking and depression were associated with implant failure in the study cohort (p < 0.05). Conclusions: Within the limitations of this retrospective, single-center cohort, the evaluated Morse-tapered hybrid dental implant system demonstrated favorable long-term clinical and radiographic performance, with high implant survival, favorable prosthetic outcomes, and limited marginal bone loss over up to 108 months of function. Implant survival and marginal bone stability were not significantly influenced by insertion torque, bone quality, loading protocol, or prosthetic rehabilitation design under the clinical conditions evaluated. These findings should be interpreted within the context of the specific implant system, clinical setting, and patient population investigated.