Preparation and antimicrobial assay of ceramic brackets coated with TiO2 thin films
Cao Shuai, Wang Ye, Cao Lin, Wang Yu, Lin Bingpeng, Lan Wei, Cao Baocheng,
소속 상세정보
( Cao Shuai ) - Lanzhou University School of Dentistry Department of Orthodontics
( Wang Ye ) - Lanzhou University School of Dentistry Department of Orthodontics
( Cao Lin ) - Lanzhou University School of Dentistry Department of Orthodontics
( Wang Yu ) - Lanzhou University School of Dentistry Department of Orthodontics
( Lin Bingpeng ) - Lanzhou University School of Dentistry Department of Orthodontics
( Lan Wei ) - Lanzhou University School of Physical Science and Technology Department of Physics
( Cao Baocheng ) - Lanzhou University School of Dentistry Department of Orthodontics
KMID : 0361920160460030146
Abstract
Objective: Different methods have been utilized to prevent enamel deminerali-zation 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 TiO2 on organic compounds, we hoped to synthesize a novel bracket with a TiO2 thin film to develop a photocatalytic antimicrobial effect.
Methods: The sol-gel dip coating method was used to prepare TiO2 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°C showed the greatest photocatalytic activity in terms of MB decomposition under UV light irradiation. TiO2 thin films with 5 coating layers annealed at 700oCexhibited 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.
키워드
Biomaterial science; Esthetics; Ceramic brackets; Antibacterial
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