Mandibular Overdentures Supported by 6-mm Dental Implants: A 1-Year Prospective Cohort Study

Authors

  • Felix Guljé DDS,

    1. Research associate, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, Groningen, the Netherlands and Center for Dental Implants De Mondhoek, Apeldoorn, the Netherlands;
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  • Gerry M. Raghoebar DDS, MD, PhD,

    1. professor, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands;
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  • Jan-Willem P. Ter Meulen DDS,

    1. research associate, Center for Dental Implants, Ulft, the Netherlands;
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  • Arjan Vissink DDS, MD, PhD,

    1. professor, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands;
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  • Henny J. A. Meijer DDS, PhD

    Corresponding author
    1. professor, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands and Department of Fixed and Removable Prosthodontics, Dental School, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
      Prof. Dr. Henny J. A. Meijer, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, PO Box 30.001, NL-9700 RB Groningen, The Netherlands; e-mail: h.j.a.meijer@kchir.umcg.nl
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  • Conflict of interest and sources of funding statement: The authors declare that there are no conflicts of interest in this study. No external funding was obtained.

Prof. Dr. Henny J. A. Meijer, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, PO Box 30.001, NL-9700 RB Groningen, The Netherlands; e-mail: h.j.a.meijer@kchir.umcg.nl

ABSTRACT

Background: The extremely resorbed edentulous mandible, with a bone height of 8 mm or less, is still a challenge in implant dentistry. Recently, dental implants of 6 mm in length have been developed.

Purpose: The purpose of this 1-year prospective cohort study was to evaluate treatment outcome of mandibular overdentures supported by four 6-mm dental implants.

Materials and Methods: Twelve edentulous patients with a mandibular height between 6 and 8 mm participated. The patients were treated with an overdenture supported by four 6-mm OsseoSpeed™ dental implants (Astra Tech AB, Mölndal, Sweden). Clinical and radiographic parameters were evaluated 1 year after completion of the prosthetic treatment. Patients' satisfaction was scored before implant surgery and 1 year after prosthetic treatment.

Results: One-year implant survival rate was 96% (two implants were lost). One patient had a fracture of the mandible in the region of one of the implants 3 weeks after implant surgery. Mean scores for plaque, calculus, gingiva, bleeding, and pocket probing depth were low. Patients' satisfaction was high.

Conclusion: One-year follow-up data revealed that four 6-mm dental implants inserted in an extremely resorbed edentulous mandible provided a solid basis for a bar-retained overdenture.

Ancillary