| 摘要: |
| 目的研究掺氮TiO2-xNx薄膜托槽的制备过程对粘接强度的影响。方法应用磁控溅射法在普通金属托槽表面制备TiO2-xNx薄膜得到掺氮TiO2-xNx薄膜托槽,将掺氮TiO2-xNx薄膜托槽通入氮气后在450℃条件下退火处理2 h得到退火后掺氮TiO2-xNx薄膜托槽。通过X射线衍射观察普通金属托槽及退火前、退火后掺氮TiO2-xNx薄膜托槽表面结构,通过扫描电镜(SEM)观察3种托槽网底形貌。将60颗因正畸需要已拔除的健康前磨牙按照3种托槽和2种储存条件(室温蒸馏水、冷热循环)随机分为6组,每组10颗,使用京津釉质粘合剂按要求粘接,用电子万能材料试验机测试并记录所有托槽的剪切强度,使用SPSS 17.0统计软件处理数据,并对实验结果进行单因素方差分析。结果掺氮TiO2-xNx薄膜托槽表面为均一的锐钛矿相结构,晶粒粒径为30 nm。3种托槽的底板网格清晰,排列整齐,无明显不同。冷热循环条件下的3种托槽粘接强度均低于室温蒸馏水保存下的托槽粘接强度(P<0.01),同一处理条件下3种托槽的粘接强度差异无统计学意义(P>0.05)。 结论掺氮TiO2-xNx薄膜托槽的粘接强度没有受到制备过程的影响,能够满足临床正畸治疗需要。 |
| 关键词: 正畸托架 掺氮TiO2薄膜 粘接强度 冷热循环 |
| DOI：10.3724/SP.J.1008.2012.001231 |
| 投稿时间：2012-06-04修订日期：2012-11-01 |
| 基金项目:中央高校基本科研业务费专项资金(lzujbky-2010-83) ,甘肃省国际科技合作基金(090WCGA903). |
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| Study on bonding strength of nitrogen-doped TiO2-xNx films to orthodontic brackets |
| WANG Pu1,CAO Bao-cheng1*,WANG Jing1,CAO Shuai1,GAO Jing1,WANG Yu-hua2 |
(1. Department of Orthodontics, School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu, China
2. Institute of Functional and Environmental Materials, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, China
*Corresponding author.) |
| Abstract: |
| Objective To evaluate the effect of preparation process on the bonding strength of the nitrogen-doped TiO2-xNx films on brackets. MethodsRadio frequency magnetron sputtering was used to prepare nitrogen-doped TiO2-xNx films on the surface of stainless steel brackets. Post annealing was performed on TiO2-xNx films at 450℃ in nitrogen atmosphere for 2 h. The structures and surface morphologies of 3 types brackets, ordinary stainless steel brackets, nitrogen-doped TiO2-xNx films on brackets before annealing and the brackets after annealing, were evaluated by X-ray diffraction. The base plate of brackets was observed by scanning electron microscopy (SEM). The three types of brackets were also divided into 2 groups according to storing methods: distilled water at room temperature and thermal cycling. Sixty extracted human premolars (due to orthodontic demand) were bonded with 6 kinds of brackets using Jing-Jin enamel adhesive (n=10). All bonded specimens were tested on electronic universal testing machine to determine the bond strength. The data were analyzed by SPSS 17.0 software and the results were analyzed by one-way ANOVA. Results The TiO2-xNx thin films on brackets were in anatase phase, with the grain size being 30 nm. The base plates of 3 brackets were clear and well-organized, with no obvious differences. One-way ANOVA test showed that the bond strength of the brackets was significantly decreased after thermal cycling (P<0.01), and there were no significant differences among the 3 groups with the same storing methods (P>0.05). Conclusion The bonding strength of the nitrogen-doped TiO2-xNx films on brackets is not influenced by the preparation process, and can meet the demand of clinical orthodontic application. |
| Key words: orthodontic brackets nitrogen-doped TiO2-xNx films bonding strength thermal cycling |
