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Micro finite element analysis of continuously loaded mini-implants - A micro-CT study in the rat tail model
Robert Kerberger1, Giulia Brunello2, Dieter Drescher3
1Department of Orthodontics, University Hospital Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany; Department of Orthodontics and Dentofacial Orthopedics, Charité, Charité Centrum CC03, Institute for Dental and Craniofacial Sciences, Aßmannshauser Straße 4-6, 14197 Berlin, Germany.
Bone
|September 22, 2023
Summary
Local stresses impact orthodontic mini-implant (OMI) migration and bone remodeling. Initial bone loss followed by bone gain suggests stress-related resorption may influence OMI displacement.
Area of Science:
- Orthodontics
- Biomaterials Science
- Craniofacial Biology
Background:
- Orthodontic mini-implants (OMIs) can experience minor displacement under constant force, termed implant migration.
- Understanding the biomechanical factors influencing OMI stability is crucial for successful orthodontic treatment.
Purpose of the Study:
- To investigate the relationship between local stresses and implant migration.
- To evaluate the effects of constant loading on bone remodeling around OMIs.
Main Methods:
- Two OMIs were placed in rat vertebrae and subjected to varying loads (0.0-1.5 N) using nickel-titanium springs.
- In vivo micro-CT scans and micro-finite element models analyzed stress distribution and bone volume changes over 8 weeks.
Main Results:
- Highest stresses were concentrated in the proximal top VOI, peaking at 2 weeks and then decreasing.
- Bone remodeling showed initial resorption within 2 weeks, followed by bone gain up to 8 weeks, particularly in higher loading groups.
Conclusions:
- Local stress magnitude significantly influences bone remodeling around OMIs.
- Stress-related bone resorption is a potential factor contributing to implant migration, followed by a consolidation phase with net bone gain.
