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Does Ferrule Effect Affect Implant-Abutment Stability?

Maryam Mohajerfar1, Elaheh Beyabanaki1, Allahyar Geramy2

  • 1Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

The European Journal of Prosthodontics and Restorative Dentistry
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

Crown margin placement, whether at the abutment or implant level, did not significantly affect abutment screw torque loss after cyclic loading. However, implant-level margins reduced screw stress and energy.

Keywords:
Dental ImplantFerrule EffectScrew Loosening

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Area of Science:

  • Dental Implantology
  • Biomaterials Science
  • Mechanical Engineering

Background:

  • Abutment screw loosening is a common complication in implant-supported restorations.
  • Understanding factors influencing screw stability is crucial for long-term implant success.

Purpose of the Study:

  • To evaluate the impact of crown margin placement (abutment-level vs. implant-level) on abutment screw torque loss.
  • To analyze screw mechanics under cyclic loading based on margin design.

Main Methods:

  • Twenty implant-abutment assemblies were divided into abutment-level and implant-level groups.
  • Cyclic loading (75 N, 500,000 cycles) was applied.
  • Torque loss was measured before and after loading; finite element analysis assessed screw energy and stress.

Main Results:

  • Cyclic loading did not significantly alter torque loss (P=0.73).
  • Crown margin placement showed no significant effect on torque loss (P=0.56).
  • The abutment-level model exhibited higher screw energy (4.49 mJ) and stress (22.74 MPa) compared to the implant-level model (3.52 mJ, 20.81 MPa).

Conclusions:

  • Crown margin placement relative to the implant shoulder does not significantly influence abutment screw torque loss.
  • Placing the crown margin on the implant shoulder may reduce stress and energy within the abutment-implant screw.