Long-term results of implant-supported over-dentures retained by double crowns: a practice-based retrospective study after minimally 10 years follow-up.

摘要: Background Different concepts regarding the number of implants and attachment systems for preparation implant-supported over-dentures (IODs) have been discussed. Nonetheless, long-term results double-crown-retained IODs with an observational period more than 10 years are still rare in literature. Objective The aim this practice-based study was to retrospectively evaluate clinical outcome (success/survival rates, technical/biological complications) retained by double crowns. Material methods In a private practice, 36 non-smoking edentulous patients were restored between 1991 2002 supported 2–6 implants. For retrospective evaluation implant prosthetic survival (in-situ criterion) success (event-free period), only those included who regularly (at least once year) participated professional maintenance programme had functional restoration 10 years. Results Twenty-two (12 Women/10 men, mean age 60.1 ± 9.8 years) 89 supporting nine maxillary 13 mandibulary dentures (mean implants/prosthesis = 4) met inclusion criteria. The follow-up 14.1 ± 2.8 years. One failed after 4.9 years (cumulative-survival rate: 98.9%). Seven two showed peri-implantitis (prevalence: patient-based = 9.1%/implant-based = 8%). Five renewed (prosthetic-survival rate 77.3% Maintenance procedures (i.e. screw loosening or acrylic fractures) required at 0.31/year patient. Conclusion This indicates that crowns offer predictable performance limited incidence biological technical complications.