Implant-supported overdentures with different bar designs: A retrospective evaluation after 5-19 years of clinical function.
- Author:
Sven RINKE
1
;
Hajo RASING
;
Nikolaus GERSDORFF
;
Ralf BUERGERS
;
Matthias ROEDIGER
Author Information
- Publication Type:Original Article
- Keywords: Bar-retained overdentures; Implants; Marginal bone level; Radiographic; Peri-implantitis
- MeSH: Denture, Overlay*; Humans; Incidence; Jaw, Edentulous; Mandible; Maxilla; Peri-Implantitis; Prevalence; Prostheses and Implants; Retrospective Studies*; Survival Rate
- From:The Journal of Advanced Prosthodontics 2015;7(4):338-343
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: This retrospective study evaluated the outcome of implant-retained overdentures (IODs) after 5-19 years of clinical function. MATERIALS AND METHODS: A retrospective analysis of patient files was performed referring to 27 patients who received 36 IODs with 3 different bar designs (group A=prefabricated round bars, n=7; group B=one-piece anterior milled bars, n=20; and group C=two bilaterally placed milled bars, n=9) in the mandible (n=24) and/or in the maxilla (n=12). The analysis focused on the survival and success rates (according to Kaplan-Meier) of the implants and prostheses. Technical complication rates for each type of restoration were analyzed and compared via one-way ANOVA and the Chi-squared test. The prevalence of peri-implantitis (radiographic bone loss > or =3.5 mm) was evaluated by digital analysis of panoramic radiographs taken post-operative (baseline) and after 5-19 years of clinical function (follow-up). RESULTS: The mean observational time was 7.3 years. The survival rates of the prostheses and implants were 100% and 97.7%, respectively. Technical complications occurred more frequently in group A (mean: 3.5 during observational time) than in the other two groups (B: 0.8; C: 1.0). However, this difference was not statistically significant (P=0.58). Peri-implantitis was diagnosed for 12.4% of the implants in 37% of the patients. CONCLUSION: Bar-retained IODs are an adequate treatment option for edentulous jaws. These restorations may exhibit high implant/prosthesis survival rates (>97%), and a limited incidence of technical complications after a mean observational period of >7 years. Nevertheless, peri-implantitis was identified as a frequent and serious biological complication for this type of reconstruction.
