中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (34): 5039-5044.doi: 10.3969/j.issn.2095-4344.2016.34.004

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

制备TiO2-xNx薄膜陶瓷托槽的抗菌性能

王建卫,王 宇,车远倩,朱博武,曹宝成   

  1. 兰州大学口腔医学院,甘肃省兰州市  730000
  • 收稿日期:2016-07-09 出版日期:2016-08-19 发布日期:2016-08-19
  • 通讯作者: 曹宝成,教授,兰州大学口腔医学院正畸科,甘肃省兰州市 730000
  • 作者简介:王建卫,女,1967年生,汉族,甘肃省兰州市人,主治医师,主要从事口腔正畸生物力学及材料学研究。
  • 基金资助:

    甘肃省自然科学基金(1208RJZA236)

TiO2-xNx thin films on ceramic bracket surfaces: preparation and antibiotic performance

Wang Jian-wei, Wang Yu, Che Yuan-qian, Zhu Bo-wu, Cao Bao-cheng   

  1. School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China
  • Received:2016-07-09 Online:2016-08-19 Published:2016-08-19
  • Contact: Cao Bao-cheng, Professor, School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China
  • About author:Wang Jian-wei, Attending physician, School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China
  • Supported by:

    the Natural Science Foundation of Gansu Province, No. 1208RJZA236

摘要:

文章快速阅读:

 

文题释义:
陶瓷托槽
:与天然牙相近,然而,由于托槽结构复杂,使得托槽周围容易聚集菌斑且不易清洁,同时,固定矫治装置使得口腔的微生态环境发生变化,使变形链球菌等致龋菌数量增加,引起釉质脱矿等一系列并发症,调查显示,正畸人群中牙釉质脱矿发病率在73%-95%。为了解决这一正畸治疗的并发症,曾有学者尝试在牙面上涂布抗菌药物,在粘接剂中添加抗菌颗粒或在金属托槽上镀抗菌材料,以达到抗菌防龋目的。
纳米TiO2:是一种光催化材料,因具有良好的化学稳定性、生物安全性及自洁能力,被广泛应用于污染治理、环境保护、生物医药等领域,在波长小于387.5 nm(紫外光波长)的光照射下,形成OH自由基、活性羟基、超氧离子、过羟基和双氧水等,他们不但能使细菌失去活性,同时能够降解细菌死亡后释放的有毒组分,但由于二氧化钛是一种宽带隙半导体,只能吸收紫外光和少量可见光,研究显示,氮掺杂改性可有效提高纳米TiO2的可见光催化活性。


背景:正畸固定矫治中牙釉质脱矿发生率较高,因此探寻一种降低正畸固定矫治中釉质脱矿率的有效方法是众多学者一直的努力。
目的:在陶瓷托槽表面制备不同厚度的TiO2-xNx薄膜,检测其抗菌性能。
方法:通过溶胶-凝胶浸渍法在陶瓷托槽表面制备不同厚度的TiO2-xNx薄膜,采用X射线衍射分析薄膜的晶体结构,扫描电子显微镜观察薄膜的表面形貌,多功能材料表面试验仪检测薄膜的附着力,使用比色仪评价镀膜前后陶瓷托槽的色泽变化。通过平板菌落计数法评估TiO2-xNx薄膜陶瓷托槽对白色念珠菌、变形链球菌的抗菌性能。
结果与结论:①TiO2-xNx薄膜为锐钛矿型,结构均匀致密,随着薄膜厚度的增加,X射线衍射峰表现为增强趋势;②厚度最高薄膜最终附着力为18.37 N,说明薄膜与托槽具有较好的附着力,可承受在口腔应用中所受到的摩擦;③镀膜后,厚度最高薄膜托槽的色泽均有所变化,但变化较小,不至于影响陶瓷托槽原有的美观特性;④TiO2-xNx薄膜陶瓷托槽对白色念珠菌、变形链球菌均有一定的抗菌性能,且随着薄膜厚度的增加抗菌性能逐渐增强,对变形链球菌的抗菌效果更明显;⑤结果表明,TiO2-xNx薄膜陶瓷托槽在不影响美观的同时,对常见口腔致龋菌和条件致病菌具有较高的抗菌作用,且与托槽具有较好的附着力。

ORCID: 0000-0003-0839-4027(曹宝成)

关键词: 生物材料, 口腔生物材料, 组织工程口腔材料, 溶胶凝胶-浸渍法, TiO2-xNx薄膜, 陶瓷托槽, 抗菌性, 比色, 甘肃省自然科学基金

Abstract:

BACKGROUND: Enamel demineralization has been plaguing doctors and patients in the fixed orthodontic treatment, so we attempt to seek an effective method of reducing its incidence.
OBJECTIVE: To prepare TiO2-xNx thin films at different thicknesses on the ceramic bracket surface by sol-gel method followed by detection of antibiotic performance.
METHODS: TiO2-xNx thin films at different thicknesses were prepared on the ceramic bracket surface by sol-gel method. The crystal structure, surface morphology and attachment force of these thin films were analyzed by X-ray diffraction, scanning electron microscope and multi-function material surface tester, respectively. The color changes of ceramic brackets before and after coating were evaluated through German VITA Easyshade Advance 4.0 photoelectric color comparator. Antibiotic performance of the ceramic bracket coated with TiO2-xNx thin film for Candida albicans and Streptococcus mutans was evaluated by the flat colony counting method.
RESULTS AND CONCLUSION: The prepared TiO2-xNx thin film was anatase type, which had uniform and compact structure, and its X-ray diffraction peaks were elevated with the increase of film thickness. The attachment force of the thickest film was 18.37 N, indicating the thin film has a good adhesion to the ceramic bracket and can withstand the friction in the oral cavity. The antibiotic performance of TiO2-xNx thin film for Candida albicans and Streptococcus mutans was also enhanced as the thickness of the thin film tended to increase, while the color changes of the ceramic brackets coated with different thickness of TiO2-xNx thin films were not significant. To conclude, the ceramic bracket coated with TiO2-xNx film that does not affect the appearance has high antibacterial activity to common oral cariogenic bacteria and opportunistic pathogens, and the film can adhere well to the bracket.

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