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Related Experiment Video

Updated: Jun 6, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Finite Element Combined Design and Material Optimization Addressing the Wear in Removable Implant Prosthodontics.

Pejman Shayanfard1, Xingchen Tan1, Matthias Karl2

  • 1Department of Materials Science, Institute of Materials Simulation, Friedrich-Alexander University Erlangen-Nürnberg, 90762 Fürth, Germany.

Journal of Functional Biomaterials
|November 26, 2024
PubMed
Summary

Wear in dental implant attachments is common. Flexible implant designs, especially those using Nitinol, significantly reduce wear by up to 90%, improving prosthesis longevity.

Keywords:
design optimizationfinite element methodimplant-supported removable prosthesismaterial optimizationshape memory alloytitaniumwear in female attachment part

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Area of Science:

  • Biomaterials Engineering
  • Mechanical Engineering
  • Dental Implantology

Background:

  • Wear at the male-female interface of retentive elements is a frequent complication in implant-supported removable prostheses.
  • Insertion path limitations and fabrication inaccuracies contribute significantly to this wear phenomenon.

Purpose of the Study:

  • To investigate a novel male attachment design with lateral flexibility to mitigate wear.
  • To compare the wear-inducing maximum strain of flexible designs against traditional rigid ball anchors using finite element analysis.

Main Methods:

  • Parametric finite element analysis was employed to compare various attachment designs made from titanium and Nitinol.
  • Mechanical strains causing wear in the female component were evaluated under different insertion misfit scenarios.
  • The role of stresses and martensitic transformation in flexible implant shafts was assessed.

Main Results:

  • A titanium implant with a long flexible shaft reduced maximum strains by up to 61% compared to a solid ball anchor.
  • Using Nitinol as the shaft material further improved performance, allowing for a shorter abutment.
  • An optimized Nitinol design with a flexible shaft achieved an approximate 90% reduction in maximum strains, indicating significantly reduced wear.

Conclusions:

  • Flexible implant shaft designs effectively reduce wear at the male-female interface of dental prostheses.
  • Nitinol-based flexible shafts offer superior performance and design advantages for implant attachments.
  • Optimized flexible designs hold significant promise for enhancing the durability and success of implant-supported removable prostheses.