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A stainless steel bracket for orthodontic application.

Keun-Taek Oh¹, Sung-Uk Choo, Kwang-Mahn Kim

¹Research Institute of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul, Korea. okt0505@yonsei.ac.kr

European Journal of Orthodontics

|June 11, 2005

Summary

The new SR-50A stainless steel bracket offers superior corrosion resistance and biocompatibility compared to traditional Mini-diamond and Archist orthodontic brackets. This material demonstrates improved frictional properties and a lower risk of allergic reactions for patients.

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Area of Science:

Materials Science
Biocompatibility
Orthodontics

Background:

Aesthetics is a key factor in orthodontic fixed appliance selection.
Stainless steel (SS) brackets (types 304, 316, 17-4 PH) are common but susceptible to oral corrosion.
Evaluating bracket material properties is crucial for clinical success.

Purpose of the Study:

To assess the sizing accuracy, microstructure, hardness, corrosion, friction, and cytotoxicity of Mini-diamond, Archist, and SR-50A brackets.
To compare an experimental SR-50A bracket with commercially available SS orthodontic brackets.

Main Methods:

Evaluation of size accuracy, microstructure via micrographs, and hardness.
Corrosion resistance testing in artificial saliva using polarization resistance.

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Frictional force measurements with orthodontic wire and cytotoxicity assessment.

Main Results:

SR-50A exhibited the highest corrosion resistance (0.9 x 10(-3) mpy) and superior biocompatibility (response index 0/1).
Mini-diamond showed the highest overall size accuracy.
SR-50A displayed favorable frictional properties, with decreasing force over time, unlike Mini-diamond and Archist.

Conclusions:

The experimental SR-50A bracket demonstrates excellent frictional properties, corrosion resistance, and biocompatibility.
SR-50A offers a potentially lower risk of allergic reactions compared to conventional stainless steel brackets.
SR-50A presents a promising alternative for orthodontic fixed appliances.