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KMID : 1023820150070040338
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 4 p.338 ~ p.343
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Implant-supported overdentures with different bar designs: A retrospective evaluation after 5-19 years of clinical function
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Sven Rinke
Hajo Rasing
Nikolaus Gersdorff
Ralf Buergers
Matthias Roediger
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Abstract
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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 ≥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.
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KEYWORD
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Bar-retained overdentures, Implants, Marginal bone level, Radiographic, Peri-implantitis
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