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Torsional properties and microstructures of miniscrew implants
Masahiro Iijima1, Takeshi Muguruma, William A Brantley
1Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido, Japan. iijima@hoku-iryo-u.ac.jp
Adding elements like vanadium and aluminum to titanium significantly enhances the torsional strength of orthodontic miniscrew implants. Further research is needed to optimize compositions for improved mechanical properties and biocompatibility.
Area of Science:
- Orthodontics
- Materials Science
- Biomedical Engineering
Background:
- Titanium miniscrew implants are widely used in orthodontics.
- Limited data exists on the torsional performance of these implants.
Purpose of the Study:
- To evaluate and compare the torsional performance of different brands of titanium miniscrew implants.
- To investigate the effect of elemental composition on torsional strength.
Main Methods:
- Four brands of 1.6-mm diameter miniscrew implants were tested in torsion.
- X-ray fluorescence and micro X-ray diffraction analyzed implant composition and phases.
- Scanning electron microscopy examined implant microstructures.
Main Results:
- Miniscrew implants B and D, containing vanadium, aluminum, iron, and manganese, exhibited significantly higher torsional moments at failure compared to pure titanium implants (A and C).
- Microstructural analysis revealed the presence of alpha-titanium in all implants, with beta-titanium observed in implants B and D.
Conclusions:
- The addition of small amounts of alloying elements to titanium significantly improves the torsional performance of miniscrew implants.
- Further research is recommended to determine optimal compositions for enhanced mechanical properties and biocompatibility.
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