Friction properties of orthodontic brackets coated with TiO2-xNy

doi:10.3969/j.issn.2095-4344.2014.47.014

Abstract

Abstract:

BACKGROUND: In previous experiments, TiO_2-xN_y-coated bracket has been confirmed to have excellent antibacterial properties and biological safety performance.
OBJECTIVE: To study the friction properties of orthodontic brackets coated with TiO_2-xN_yfilm.
METHODS: TiO_2-xN_yfilm was prepared by radiofrequency magnetron sputtering on MBT bracket (0.022″). The TiO_2-xN_y-coated brackets were analyzed by X-ray diffraction and scanning electron microscopy observations. The coefficient of static friction and coefficient of kinetic friction between the wires (0.012″, 0.014″, 0.016″) and orthodontic brackets were calculated.
RESULTS AND CONCLUSION: TiO_2-xN_yfilm on the bracket was of anatase structure, which was compact and had good crystallinity. Under dry condition, the coefficient of static friction and kinetic friction of the brackets coated with TiO_2-xN_ywere less than those of ordinary brackets; under wet condition, the coefficients of static friction and kinetic friction of the brackets coated with TiO_2-xN_ywere less than those of ordinary brackets, but the difference was not statistically significant. Nano-TiO_2-xN_yfilm can reduce the friction between bracket and archwire, which will offer a novel opportunity to significantly reduce the friction during tooth movement.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: nanoparticles, friction, orthodontic extrusion

CLC Number:

R318

Li Na, Zhou Hai-jing, Han Bing, Zhang Ying-jie, Cao Bao-cheng. Friction properties of orthodontic brackets coated with TiO_2-xN_y[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(47): 7621-7626.

Figures/Tables 3

2.2 TiO2-xNy薄膜托槽的表面摩擦性能表1是3组弓丝在干燥状态和湿润状态下分别与普通托槽、TiO2-xNy薄膜托槽的最大静摩擦系数。方差分析结果显示：①干燥时，0.012″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(P < 0.001)，0.014″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(P < 0.001)，0.016″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(P < 0.001)；普通托槽与0.012″、0.014″、0.016″弓丝之间的最大静摩擦系数比较差异无显著性意义(P > 0.001), TiO2-xNy薄膜托槽与0.012″、0.014″、0.016″弓丝之间的最大静摩擦系数比较差异无显著性意义(P > 0.001)。②湿润时，0.012″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)，0.014″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)， 0.016″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)；普通托槽与0.012″、0.014″、0.016″弓丝之间的最大静摩擦系数比较差异无显著性意义(P > 0.001)， TiO2-xNy薄膜托槽与0.012″、0.014″、0.016″弓丝之间的最大静摩擦系数比较差异无显著性意义(P > 0.001)。干燥状态下，TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(16.14%)(t=8.167，P=0)；湿润状态下，TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(7.79%)，但差异无显著性意义(t=1.616，P=0.128)，见图4A。表2是3组弓丝在干燥状态和湿润状态下分别与普通托槽、TiO2-xNy薄膜托槽的动摩擦系数。方差分析结果显示：①干燥时，0.012″弓丝与TiO2-xNy薄膜托槽的最大静摩擦系数小于普通托槽(P < 0.001)，0.014″弓丝与TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽(P < 0.001), 0.016″弓丝与TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽(P < 0.001)；普通托槽与0.012″、0.014″、0.016″弓丝之间的动摩擦系数比较差异无显著性意义(P > 0.001)，TiO2-xNy薄膜托槽与0.012″、0.014″、0.016″弓丝之间的动摩擦系数比较差异无显著性意义(P > 0.001)。②湿润时，0.012″弓丝与TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)，0.014″弓丝与TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)， 0.016″弓丝与TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽，但差异无显著性意义(P > 0.001)；普通托槽与0.012″、0.014″、0.016″弓丝之间的动摩擦系数比较差异无显著性意义(P > 0.001)，TiO2-xNy薄膜托槽与0.012″、0.014″、0.016″弓丝之间的动摩擦系数比较差异无显著性意义(P > 0.001)。干燥状态下，TiO2-xNy薄膜托槽的动摩擦系数小于普通托槽(20.60%)(t=7.86，P=0)；湿润状态下，TiO2-xNy薄膜托槽的动摩擦系数都要小于普通托槽(7.94%)，但差异无显著性意义(t=1.707，P=0.110)，见图4B。"

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