Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (38): 7047-7052.doi: 10.3969/j.issn.2095-4344.2012.38.004

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Development of a nanometer Ag/TiO2 coated bracket and its mechanical properties

Zhang Sheng1, Mai Li-xiang2, Liu Da-lie3, Zhang Jin-cai1   

  1. 1Department of Orthodontics, Guangdong Provincial Stomatological Hospital & the Affiliated Stomatology Hospital of Southern Medical University, Guangzhou 510280, Guangdong Province, China
    2Department of Orthodontics, Guanghua Stomatological College & the Affiliated Stomatology Hospital of Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
    3Department of Plastic Surgery, Zhujiang Hospital of Southern Medical University, Guangzhou 510200, Guangdong Province, China
  • Received:2012-05-05 Revised:2012-05-22 Online:2012-09-16 Published:2012-09-16
  • Contact: Zhang Jin-cai, Department of Orthodontics, Guangdong Provincial Stomatological Hospital & the Affiliated Stomatology Hospital of Southern Medical University, Guangzhou 510280, Guangdong Province, China jincaizhang@live.cn
  • About author:Zhang Sheng☆, Studying for doctorate, Physician, Department of Orthodontics, Guangdong Provincial Stomatological Hospital & the Affiliated Stomatology Hospital of Southern Medical University, Guangzhou 510280, Guangdong Province, China 65071863@qq.com

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Abstract:

BACKGROUND: In our prophase study, Ag can be deposited on TiO2 films, which can enhance the antibacterial effect of TiO2 coated films.
OBJECTIVE: To develop a nanometer Ag/TiO2 coated bracket and to study its mechanical properties.
METHODS: The nanometer Ag/TiO2 coated bracket was prepared using sol-gel method at different annealing temperatures. Scanning electron microscope was used to study the surface morphology of Ag/TiO2 coated bracket. The surface roughness of metal bracket, nanometer TiO2 coated bracket and nanometer Ag/TiO2 coated bracket was measured. The combination intensity of TiO2 and Ag/TiO2 coatings with brackets was measured by scratch test.
RESULTS AND CONCLUSION: Nanometer Ag/TiO2 film was 120 nm in deepness, and it was a nanoparticle film with a thorough tissue structure. Ag particles were visibly deposited on the film surface that was flat, smooth, and highly polished. There were no significant differences among the surface roughness of nanometer TiO2 coated brackets, nanometer Ag/TiO2 coated brackets and brackets used commercially (P > 0. 05). The combination intensities of nanometer TiO2 and Ag/TiO2 coatings with brackets at annealing temperatures of 120, 200 and 300 ℃ were 1.18, 1.16, 1.12 and 1.26 kg, respectively. These findings indicated that nanometer Ag/TiO2 coated bracket was developed successfully and it had good mechanical properties that could meet the clinical demand of orthodontics.

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