J Adv Prosthodont.  2015 Aug;7(4):338-343. 10.4047/jap.2015.7.4.338.

Implant-supported overdentures with different bar designs: A retrospective evaluation after 5-19 years of clinical function

Affiliations
  • 1Department of Prosthodontics, Georg-August-University, Goettingen, Germany. matthias.roediger@med.uni-goettingen.de
  • 2Private Practice, Hanau, Germany.

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.

Keyword

Bar-retained overdentures; Implants; Marginal bone level; Radiographic; Peri-implantitis

MeSH Terms

Denture, Overlay*
Humans
Incidence
Jaw, Edentulous
Mandible
Maxilla
Peri-Implantitis
Prevalence
Prostheses and Implants
Retrospective Studies*
Survival Rate

Figure

  • Fig. 1 Measurement of radiographic bone loss. (A) Baseline after implant insertion, (B) After 5 years of clinical function. The implant length is marked for calibration (green line), and the highest bone loss at implant 032 (mesial site, red line) is also marked.

  • Fig. 2 Number of technical complications according to the bar design (means with 95% confidence intervals) after a 7.3-year mean observation time.

  • Fig. 3 Success rates (Kaplan Meier analysis) of implant-retained overdentures with 3 different bar designs after a 7.3-year mean observation time.

  • Fig. 4 Distribution of peri-implantitis (red fraction) in non-smokers (4/17=23.5%) and smokers (6/10=60%).


Cited by  1 articles

Precision of the milled full-arch framework fabricated using pre-sintered soft alloy: A pilot study
Hyun-Wook Woo, Sung-Am Cho, Cheong-Hee Lee, Kyu-Bok Lee, Jin-Hyun Cho, Du-Hyeong Lee
J Adv Prosthodont. 2018;10(2):128-131.    doi: 10.4047/jap.2018.10.2.128.


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