Survival and failure modes: platform-switching for internal and external hexagon cemented fixed dental prostheses.

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  • Additional Information
    • Source:
      Publisher: Wiley-Blackwell Country of Publication: England NLM ID: 9504563 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1600-0722 (Electronic) Linking ISSN: 09098836 NLM ISO Abbreviation: Eur J Oral Sci Subsets: MEDLINE
    • Publication Information:
      Publication: Chichester : Wiley-Blackwell
      Original Publication: Copenhagen : Munksgaard, c1995-
    • Subject Terms:
      Crowns* ; Dental Implant-Abutment Design* ; Dental Restoration Failure*; Dental Abutments ; Dental Implants ; Dental Prosthesis Design ; Dental Stress Analysis ; Reproducibility of Results
    • Abstract:
      This study evaluated the probability of survival (reliability) of platform-switched fixed dental prostheses (FDPs) cemented on different implant-abutment connection designs. Eighty-four-three-unit FDPs (molar pontic) were cemented on abutments connected to two implants of external or internal hexagon connection. Four groups (n = 21 each) were established: external hexagon connection and regular platform (ERC); external hexagon connection and switched platform (ESC); internal hexagon and regular platform (IRC); and internal hexagon and switched platform (ISC). Prostheses were subjected to step-stress accelerated life testing in water. Weibull curves and probability of survival for a mission of 100,000 cycles at 400 N (two-sided 90% CI) were calculated. The beta values of 0.22, 0.48, 0.50, and 1.25 for groups ERC, ESC, IRC, and ISC, respectively, indicated a limited role of fatigue in damage accumulation, except for group ISC. Survival decreased for both platform-switched groups (ESC: 74%, and ISC: 59%) compared with the regular matching platform counterparts (ERC: 95%, and IRC: 98%). Characteristic strength was higher only for ERC compared with ESC, but not different between internal connections. Failures chiefly involved the abutment screw. Platform switching decreased the probability of survival of FDPs on both external and internal connections. The absence in loss of characteristic strength observed in internal hexagon connections favor their use compared with platform-switched external hexagon connections.
      (© 2016 Eur J Oral Sci.)
    • Contributed Indexing:
      Keywords: Weibull; dental implant; fatigue; fixed dental prostheses; fractography
    • Accession Number:
      0 (Dental Implants)
    • Publication Date:
      Date Created: 20160930 Date Completed: 20180416 Latest Revision: 20181202
    • Publication Date:
      20231215
    • Accession Number:
      10.1111/eos.12298
    • Accession Number:
      27680671