Stability of the screw joints in patients with implant-supported fixed prostheses in edentulous jaws: a 1-year follow-up study

Int J Prosthodont. 2004 Mar-Apr;17(2):177-80.


Purpose: The purpose of this follow-up study was to evaluate the stability of the screw joint in edentulous patients 1 year after treatment with implant-supported fixed prostheses (Brånemark system).

Materials and methods: A total of 20 patients were included, 10 treated in the maxilla and 10 in the mandible. The fixed prostheses were removed approximately 1 year after insertion, and the stability of the screw joints was evaluated using a rating scale based upon the CDA quality evaluation criteria of dental care.

Results: All implant-supported fixed prostheses were recorded as stable before the prosthetic screws (gold screws) were unscrewed. "Unacceptable loosening" was observed in 4% of the prosthetic screws and in 29% of the abutment screws.

Conclusion: In this study, only a few of the prosthetic screws showed unacceptable loosening after 1 year of function. The clinical relevance of the observed high occurrence of loose abutment screws could be questioned, as all fixed prostheses were initially recorded as stable.

MeSH terms

  • Aged
  • Dental Abutments
  • Dental Prosthesis Retention / instrumentation*
  • Dental Prosthesis, Implant-Supported*
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Middle Aged
  • Mouth, Edentulous / rehabilitation