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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Evaluation of micro-gap at implant abutment interface using different connection design.

Vidhyadhar D1, Tejosmita Chowdary Pavuluri2, Vivek Anne3

  • 1Department of Prosthodontics Crown and Bridge, Balaji Family Dental Care, Kamareddy, Telangana, India.

Bioinformation
|June 12, 2026
PubMed
Summary

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The study compared implant-abutment connections, finding internal conical designs minimize micro-gaps. This offers superior stability and resistance to enlargement, advancing dental implant design for better clinical results.

Area of Science:

  • Dental Implantology
  • Biomaterials Science
  • Mechanical Engineering

Background:

  • Micro-gaps at the implant-abutment interface present biological and mechanical challenges.
  • The impact of various connection designs on micro-gap formation is not fully understood.

Purpose of the Study:

  • To evaluate and compare micro-gap sizes in external hex, internal hex, and internal conical implant-abutment connections.
  • To assess the stability of these interfaces before and after cyclic loading.

Main Methods:

  • Scanning Electron Microscopy (SEM) was used to analyze 100 implant-abutment assemblies.
  • Assemblies underwent cyclic loading to simulate functional stress.
  • Statistical analysis was performed to compare micro-gap sizes among different designs.
Keywords:
Abutment interfacecyclic loadingimplant connectionmicro-gapscanning electron microscope (SEM)

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Main Results:

  • External hex connections exhibited the largest micro-gaps.
  • Internal hex connections showed moderate micro-gap sizes.
  • Internal conical connections demonstrated the smallest and most stable interfaces, with superior resistance to micro-gap enlargement under load.

Conclusions:

  • Internal conical implant-abutment connections offer the most stable interface.
  • These findings provide evidence for optimizing implant-abutment design to improve clinical outcomes and reduce complications.