The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Preparation and antimicrobial assay of ceramic brackets coated with TiO2 thin films

  • Cao, Shuai (Department of Orthodontics, School of Dentistry, Lanzhou University) ;
  • Wang, Ye (Department of Orthodontics, School of Dentistry, Lanzhou University) ;
  • Cao, Lin (Department of Orthodontics, School of Dentistry, Lanzhou University) ;
  • Wang, Yu (Department of Orthodontics, School of Dentistry, Lanzhou University) ;
  • Lin, Bingpeng (Department of Orthodontics, School of Dentistry, Lanzhou University) ;
  • Lan, Wei (Department of Physics, School of Physical Science and Technology, Lanzhou University) ;
  • Cao, Baocheng (Department of Orthodontics, School of Dentistry, Lanzhou University)
  • Received : 2015.01.24
  • Accepted : 2015.07.28
  • Published : 2016.05.25
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Abstract

Objective: Different methods have been utilized to prevent enamel demineralization and other complications during orthodontic treatment. However, none of these methods can offer long-lasting and effective prevention of orthodontic complications or interventions after complications occur. Considering the photocatalytic effect of $TiO_2$ on organic compounds, we hoped to synthesize a novel bracket with a $TiO_2$ thin film to develop a photocatalytic antimicrobial effect. Methods: The sol-gel dip coating method was used to prepare $TiO_2$ thin films on ceramic bracket surfaces. Twenty groups of samples were composed according to the experimental parameters. Crystalline structure and surface morphology were characterized by X-ray diffraction and scanning electron microscopy, respectively; film thickness was examined with a surface ellipsometer. The photocatalytic properties under ultraviolet (UV) light irradiation were analyzed by evaluating the degradation ratio of methylene blue (MB) at a certain time. Antibacterial activities of selected thin films were also tested against Lactobacillus acidophilus and Candida albicans. Results: Films with 5 coating layers annealed at $700^{\circ}C$ showed the greatest photocatalytic activity in terms of MB decomposition under UV light irradiation. $TiO_2$ thin films with 5 coating layers annealed at $700^{\circ}C$ exhibited the greatest antimicrobial activity under UV-A light irradiation. Conclusions: These results provide promising guidance in prevention of demineralization by increasing antimicrobial activities of film coated brackets.

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References

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