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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Mini-implant loosening: 3D analysis using the finite element method.

Allahyar Geramy1, Jean Marc Retrouvey, Reza Jelodar

  • 1Department of Orthodontics, School of Dental Medicine, Tehran University of Medical Sciences, Tehran, Iran. gueramya@yahoo.com

Orthodontics : the Art and Practice of Dentofacial Enhancement
|May 9, 2012
PubMed
Summary
This summary is machine-generated.

Mini-implant loosening in orthodontics is linked to placement proximity to tooth roots. Finite element analysis shows stress and energy in implants and bone vary with diameter and position, impacting stability.

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Area of Science:

  • Orthodontic biomechanics
  • Dental implantology
  • Finite element analysis in dentistry

Background:

  • Mini-implants offer absolute anchorage in orthodontics.
  • Mini-implant failure, often due to loosening, is a complex issue.
  • Understanding biomechanical factors influencing stability is crucial.

Purpose of the Study:

  • To evaluate the impact of mini-implant positioning and diameter on stability.
  • To analyze stress and energy distribution in mini-implants and surrounding bone using finite element analysis.
  • To identify factors contributing to mini-implant loosening.

Main Methods:

  • Developed twelve 3D finite element models of the mandibular posterior segment.
  • Included first molar, mini-implant (1.3, 1.6, 2.2 mm diameters), periodontal ligament, and bone.
  • Applied a 300 N vertical force to the occlusal surface and assessed von Mises stress and energy.

Main Results:

  • Mini-implant stress ranged from 15.284 to 359.77 MPa; energy ranged from 0.00084 to 0.258 mJ.
  • Bone stress ranged from 17.611 to 129.45 MPa; energy ranged from 0.296 to 1.575 mJ.
  • Results varied based on mini-implant diameter and location.

Conclusions:

  • Closer proximity of mini-implants to tooth roots directly influences loosening parameters.
  • Finite element analysis provides insights into biomechanical factors affecting mini-implant stability.
  • Optimizing mini-implant placement is key to preventing orthodontic anchorage failure.