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Developing a fixture level cast for implants with interfering axial convergence.

Swati A Ahuja1, Russell A Wicks, Robert L Brandt

  • 1Department of Restorative Dentistry, University of Tennessee Health Science Center, College of Dentistry, Memphis, Tennessee, USA.

The Journal of the Tennessee Dental Association
|August 12, 2010
PubMed
Summary
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This study introduces a new method for creating dental master casts with two closely placed, angled implants. The technique ensures accurate positioning of implant analogs for precise dental restorations.

Area of Science:

  • Dental Implantology
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Accurate master cast fabrication is crucial for successful dental implant restorations.
  • Managing closely placed and convergent implants presents unique challenges in impression making and cast fabrication.
  • Existing techniques may not adequately address the spatial relationship of multiple convergent implants.

Purpose of the Study:

  • To present a novel, reproducible technique for developing an accurate master cast for two closely placed and convergent dental implants.
  • To provide a reliable method for capturing the precise three-dimensional relationship between adjacent implants and teeth.
  • To facilitate improved fit and function of final implant-supported prostheses.

Main Methods:

  • An implant-level impression was taken using a transfer coping for the posterior implant.

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  • A positional index was fabricated intraorally, registering the second transfer coping, the healing abutment, and adjacent teeth.
  • The master cast was modified using the positional index to incorporate the second implant analog accurately.

    • Main Results:

    • The described technique allows for the precise incorporation of a second implant analog into the master cast, despite close proximity and convergence of implants.
    • The positional index effectively maintains the spatial relationship between the implants and adjacent teeth during the impression and casting process.
    • This method simplifies the fabrication of accurate master casts for complex implant arrangements.

    Conclusions:

    • The novel technique offers a reliable solution for creating master casts with multiple convergent and closely spaced implants.
    • This approach enhances the accuracy of dental restorations, potentially improving patient outcomes.
    • The technique is a valuable addition to the armamentarium for complex dental implant cases.