【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2h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30nm。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。更多还原

【Abstract】 Objective To evaluate the effect of preparation process on the bonding strength of the nitrogen-doped TiO2-xNx films on brackets.Methods Radio 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.更多还原