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A Technique for Obtaining Accurate Full-Arch Implant Impressions
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Course Objectives (2 CE Credits)

Achieving a passive fit of the prosthesis is critical when dealing with implant-borne restorations. Thanks to CAD/CAM technology, extremely accurate implant frameworks can now be virtually designed and milled from a solid block of titanium. To optimize the fit of the prosthesis, clinical and laboratory procedures must mirror this high level of accuracy. Outlining a simple procedure for obtaining accurate full-arch implant impressions, this Clinical Tip describes how to:

  • Create a sectioned implant verification jig (IVJ)
  • Fabricate a custom impression tray
  • Lute the sectioned IVJ together intraorally
  • Verify the fit of the IVJ
  • Take the final impression
  • Fabricate the master cast

Summary

Even though CAD/CAM implant frameworks have greatly improved and simplified restoring full-arch cases, an extremely accurate impression and master cast are still critical for achieving a passive fit of the prosthesis. Detailed is a highly predictable technique for obtaining accurate full-arch impressions.

References

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  2. Goodacre CJ, Kan JY, Rungcharassaeng K. Clinical complications of osseointegrated implants. J Prosthet Dent. 1999;81:537–52.
  3. Jemt T, Book K. Prosthesis misfit and marginal bone loss in edentulous patients. Int J Oral Maxillofac Implants. 1996;11:620–5.
  4. Kan JY, Rungcharassaeng K, Bohsali K, Goodacre CJ, Lang BR. Clinical methods for evaluating implant framework fit. J Prosthet Dent. 1999;81:7–13.
  5. Skalak R. Biomechanical considerations in osseointegrated prostheses. J Prosthet Dent. 1983;49:843–8.
  6. Branemark PI. Osseointegration and its experimental background. J Prosthet Dent. 1983;50:399–410.
  7. Zarb GA, Schmitt A. The longitudinal clinical effectiveness of osseointegrated dental implants: the Toronto study. Part III: problems and complications encountered. J Prosthet Dent. 1990;64:185–94.
  8. Cobb GW, Metcalf AM, Parsell D, Reeves GW. An alternate treatment method for a fixed-detachable hybrid prosthesis: A clinical report. J Prosthet Dent. 2003;89:239–43.
  9. Misch CE. Contemporary Implant Dentistry. 2nd ed. St Louis: Mosby. 1999;69:549–93.
  10. Watzek G. Endosseus Implants: Scientific and Clinical Aspects. Chicago: Quintessence. 1996:342–54.
  11. Ortorp A, Jemt T, Back T, Jalevik T. Comparisons of precision of fit between cast and CNC-milled titanium implant frameworks for the edentulous mandible. Int J Prosthodont. 2003;16:194–200.
  12. Lee H, So JS, Hochstedler JL, Ercoli C. The accuracy of implant impressions: a systematic review. J Prosthet Dent. 2008;100:285–91.
  13. Chee W, Jivaj S. Impression techniques for implant dentistry. Br Dent J. 2006;201(7):429–32.
  14. Cabral LM, Guedes CG. Comparative analysis of four impression techniques for implants. Implant Dent. 2007;16(2).
  15. Assif D, Marshak B, Schmidt A. Accuracy of implant impression techniques. Int J Oral Maxillofac Implants. 1996;11:216–22.
  16. Carr AB. Comparison of impression techniques for a five-implant mandibular model. Int J Oral Maxillofac Implants. 1991;6:448–55.

 
 
   
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