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Updated: Jun 6, 2026
11:51
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Effect of mini-implant length and diameter on primary stability under loading with two force levels
Athina Chatzigianni1, Ludger Keilig, Susanne Reimann
1Oral Technology, School of Dentistry, University of Bonn, Germany.
European Journal of Orthodontics
|November 11, 2010
Summary
Orthodontic mini-implant stability is significantly affected by length and diameter under high force levels. Longer and wider mini-implants demonstrate superior primary stability, crucial for effective orthodontic anchorage.
Area of Science:
- Orthodontics and Dental Implantology
- Biomaterials and Biomechanics
Background:
- Orthodontic mini-implants are essential for anchorage, but clinical performance can be compromised.
- Understanding factors influencing mini-implant primary stability is critical for treatment success.
Purpose of the Study:
- To evaluate the impact of mini-implant length and diameter on primary stability.
- To assess the influence of varying force levels on mini-implant biomechanical response.
Main Methods:
- In vitro insertion of 90 self-drilling mini-implants (Aarhus and Lomas types) into bovine ribs.
- Testing of two lengths (7 and 9 mm) and two diameters (1.5 and 2 mm for Lomas).
- Application of low (0.5 N) and high (2.5 N) forces using NiTi coil springs; deflection measured with a 3D laser-optical system.
Main Results:
- No significant difference in displacement at low force levels.
- At high force levels, 9 mm implants displaced less (10.5±7.5 μm) than 7 mm implants (22.3±11.3 μm).
- Wider (2 mm) implants displaced less (8.8±2.2 μm) than narrower (1.5 mm) implants (21.9±1.5 μm); significance observed at 1 N.
- Lomas mini-implants exhibited greater tipping than Aarhus mini-implants across all force levels.
Conclusions:
- Mini-implant length and diameter significantly influence primary stability under high orthodontic forces.
- Increased length and diameter enhance mini-implant resistance to displacement and tipping.
- These findings are vital for optimizing mini-implant selection and placement in clinical orthodontics.
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