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Related Experiment Videos

The Periotest method: implant-supported framework precision of fit evaluation

K B May1, M J Edge, B R Lang

  • 1Department of Prosthodontics, School of Dentistry, University of Michigan. Ann Arbor 48109-1078, USA.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|September 1, 1996
PubMed
Summary

The Periotest instrument revealed that sectioned-soldered accurate castings (SSAC) offer superior framework fit rigidity compared to one-piece castings (OPC) and sectioned-soldered inaccurate castings (SSIC). Implant location also significantly impacts framework fit precision.

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Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Prosthodontics

Background:

  • Precision of fit is critical for the longevity and success of implant-supported prostheses.
  • High noble-metal frameworks are commonly used in implant dentistry.
  • Evaluating framework fit can be challenging, necessitating reliable measurement tools.

Purpose of the Study:

  • To assess the precision of fit between cast high noble-metal frameworks and supporting implants using the Periotest instrument.
  • To compare the rigidity of three framework conditions: one-piece castings (OPC), sectioned-soldered inaccurate castings (SSIC), and sectioned-soldered accurate castings (SSAC).
  • To evaluate the influence of implant location (right anterior, center, left anterior) on framework fit rigidity.

Main Methods:

Related Experiment Videos

  • A patient-simulation model with three Branemark implants in bovine bone was used.
  • Three framework conditions (OPC, SSIC, SSAC) were fabricated using type 3 high noble alloy.
  • Periotest values (PTV) were measured on the framework's midfacial surface above each implant interface; data analyzed using ANOVA.

    • Main Results:

    • Significant differences in mean PTV were found for both framework condition (p < .01) and implant location (p < .01).
    • Sectioned-soldered accurate castings (SSAC) demonstrated significantly greater rigidity (more negative PTV) than OPC and SSIC assemblies.
    • The center implant location exhibited significantly different PTV compared to anterior locations, indicating location-dependent fit variations.

    Conclusions:

    • The Periotest instrument effectively quantified differences in framework fit precision.
    • SSAC frameworks provided significantly more rigid assemblies compared to OPC and SSIC.
    • Framework fit precision is influenced by fabrication method, clinician skill, and implant positioning.