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Overdentures borne on less than four abutments with telescopic crowns: 5-year results of a retrospective clinical study

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Abstract

Objective

Retrospective evaluation of the clinical performance of tooth-supported overdentures retained by resilient telescopic crowns with occlusal clearance fit (ODRTC) in severely reduced dentition (1–3 remaining teeth).

Materials and methods

A total of 313 ODRTCs were inserted in an undergraduate prosthodontic program (University Medical Center, Goettingen, Germany) between 2000 und 2012. Data regarding 263 ODRTCs in 221 patients were reevaluated (observational period: 64.5 ± 34.8 months), and time-dependent survival and success rates (Kaplan-Meier-Estimator) were calculated. The number of the abutment teeth was analyzed as an influencing factor (Cox regression model (p < 0.05)).

Results

The 5- and 8-year overdenture survival rates were 62% [CI: 0.55; 0.69] and 38% [CI: 0.30; 0.45]. The 5- and 8-year success-rates (biologically and technically event-free restorations) were 13% [CI: 0.09; 0.17] and 3% [CI: 0.01; 0.05]. On the abutment level, the 5- and 8-year survival rates were 55% [CI: 0.48; 0.62], and 34% [CI: 0.27; 0.42]. The number of abutment teeth significantly influenced the overdenture and abutment survival rates. Restorations with 1 or 2 abutments were significantly associated with an increased number of technical and biological complications (decementation of the primary crown, abutment fracture) compared to ODRTCs with 3 abutments.

Conclusions

The survival and success rates of ODRTCs are significantly influenced by the number of abutments.

Clinical relevance

For ODRTCs, reduced survival and success rates are expected, especially when only 1 or 2 abutment teeth are included.

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Authors and Affiliations

  1. Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany

    Sven Rinke, Lea Schneider, Vicky Wiedemann, Ralf Bürgers & Matthias Rödiger

  2. Department of Medical Statistics, Georg-August-University, Goettingen, Germany

    Xenia Schulz

Authors
  1. Sven Rinke
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  2. Lea Schneider
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  3. Xenia Schulz
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  4. Vicky Wiedemann
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  5. Ralf Bürgers
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  6. Matthias Rödiger
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Correspondence to Matthias Rödiger.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study design was approved by the local ethics committee.

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Rinke, S., Schneider, L., Schulz, X. et al. Overdentures borne on less than four abutments with telescopic crowns: 5-year results of a retrospective clinical study. Clin Oral Invest 23, 3153–3160 (2019). https://doi.org/10.1007/s00784-018-2734-1

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  • DOI: https://doi.org/10.1007/s00784-018-2734-1

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