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Related Experiment Videos

Implant-supported overdentures: a longitudinal prospective study

T Bergendal1, B Engquist

  • 1Department of Prosthodontics, Institute for Postgraduate Dental Education, Jönköping, Sweden.

The International Journal of Oral & Maxillofacial Implants
|May 15, 1998
PubMed
Summary

This study evaluated implant-retained overdentures using two attachment systems. Results show high implant survival rates, particularly in the mandible, with no significant difference between attachment types.

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Area of Science:

  • Dental Implantology
  • Prosthodontics
  • Oral Rehabilitation

Background:

  • Overdentures supported by a limited number of implants offer a viable solution for patients with missing teeth.
  • Evaluating the long-term clinical function and prognosis of such restorations is crucial for patient outcomes.

Purpose of the Study:

  • To assess the clinical function and long-term prognosis of implant-retained overdentures in the maxilla and mandible.
  • To compare the outcomes of two different attachment systems (bar-clip vs. ball attachments) supporting these overdentures.

Main Methods:

  • A prospective study involving patients requiring implant-retained overdentures with a minimum of two implants.
  • Random assignment to either a bar-clip or ball attachment system (Nobel Biocare).
  • Evaluation of implant osseointegration, survival rates, and prosthetic complications over a 7-year period.

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Main Results:

  • A total of 115 Brånemark implants supported 50 overdentures (18 maxillary, 32 mandibular).
  • Continuous osseointegration was observed in 86.1% of implants.
  • Cumulative implant survival rates after 7 years were 75.4% in the maxilla and 100% in the mandible, with no significant difference between attachment systems.

Conclusions:

  • Implant-retained overdentures with a small number of implants demonstrate favorable long-term prognosis, especially in the mandible.
  • Factors such as severe maxillary ridge resorption and poor bone quality negatively impacted implant survival.
  • Both attachment systems proved effective, with most complications being minor and easily resolved.