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

Objectives: Evaluation of the prevalence rates of periimplant mucositis and periimplantitis in partially edentulous patients in a private dental practice. Material and methods: The data of 89 patients were collected (52 female, 37 male, age at time of implant placement: 51.8±10.3 years). All patients had been treated with dental implants of the same type and fixed superstructures between January 1999 and June 2006 (observational period: 68.2±24.8 months). Results: The patient-related prevalence rate of periimplant mucositis (probing depth ≥4 mm and bleeding on probing [BOP]) was over all 44.9%. The respective rates in non-smokers without periodontal history were 30.4% and in smokers with periodontal history 80%. The multiple logistic regression analysis identified a significant association of mucositis with the independent variable “smoker” (odds ratio [OR] 3.77; P=0.023). The patient-related prevalence rate of periimplantitis (probing depth ≥5 mm, BOP/pus, radiographic bone loss) was 11.2% (smokers with periodontal history: 53.3%, non-smokers: 2.8%). No periimplant disease was diagnosed in non-smoking patients without periodontal history and with a good compliance after treatment. Statistical analysis identified a significant association of periimplantitis with “smoker” (OR: 31.58; P

Objectives Retrospective evaluation of the biological and technical complications in implant-supported single-tooth molar restorations performed in a private practice after functional periods of ≥4 years. Material and Methods Sixty-five patients (34 females, age 51.7 ± 10.6 years) with 112 implants received annual follow-up examinations and participated in a maintenance program. The survival (in situ) and success (complication-free) rates of implants and superstructures were evaluated. Time-dependent peri-implantitis rates were calculated, and the influencing factors were identified using a multiple Cox regression. Results The implant survival rate was 100%. Three of 112 crowns required replacement (prosthetic survival rate = 98.1%). Thirty technical complications were observed: loss of retention (16), ceramic fracture (10), and screw loosening (4). The success rate of the superstructures was 79.0% after 7 years. Overall, 9.2% of the patients developed peri-implantitis (probing depth ≥5 mm, BOP, suppuration, bone loss ≥3.5 mm); (smokers: 41.6%, non-smokers: 1.8%). After 7 years, the time-dependent implant success rate (free of peri-implantitis) was 100% for non-smokers and 58.6% for smokers. Multiple analysis showed a significant effect of smoking (hazard ratio, 19.5; P = 0.008) on peri-implantitis. Conclusions Implants with cemented single-tooth restorations in the molar region constitute a reliable treatment in private practice. Smokers have a significantly increased peri-implantitis rate.

Evaluation of the prevalence rates of periimplant mucositis and periimplantitis in partially edentulous patients in a private dental practice.The data of 89 patients were collected (52 female, 37 male, age at time of implant placement: 51.8 ± 10.3 years). All patients had been treated with dental implants of the same type and fixed superstructures between January 1999 and June 2006 (observational period: 68.2 ± 24.8 months).The patient-related prevalence rate of periimplant mucositis (probing depth ≥ 4 mm and bleeding on probing [BOP]) was over all 44.9%. The respective rates in non-smokers without periodontal history were 30.4% and in smokers with periodontal history 80%. The multiple logistic regression analysis identified a significant association of mucositis with the independent variable "smoker" (odds ratio [OR] 3.77; P = 0.023). The patient-related prevalence rate of periimplantitis (probing depth ≥ 5 mm, BOP/pus, radiographic bone loss) was 11.2% (smokers with periodontal history: 53.3%, non-smokers: 2.8%). No periimplant disease was diagnosed in non-smoking patients without periodontal history and with a good compliance after treatment. Statistical analysis identified a significant association of periimplantitis with "smoker" (OR: 31.58; P0.001) and "compliance" (OR: 0.09; P = 0.011). Periodontal history in general showed no significant association with periimplantitis.Smoking and compliance are important risk factors for periimplant inflammations in partially edentulous patients.