Khan Abdul Samad, AlAbdali Ahlam, Irshad Nadia, AlMusayyab Othoob, AlQahtani Norah, Shah Asma Tufail, Akhtar Sultan, Slimani Yassine
Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
Eur J Dent. 2025 May;19(2):389-398. doi: 10.1055/s-0044-1789003. Epub 2024 Sep 18.
The aim is to coat orthodontic brackets with two different bioactive materials and to compare the mechanical and morphological properties of coated brackets and tooth surfaces.
A total of 120 stainless steel brackets were divided equally into three groups, that is, the uncoated brackets and nanohydroxyapatite (nHA)-coated, and nanobioactive glass (nBG)-coated brackets using a spin coater machine. The brackets were bonded on the enamel surface and underwent remineralization/demineralization cycles for days 1, 7, 14, and 30. At each time interval, the bond strength of the brackets was assessed using mechanical loading. An optical and scanning electron microscope (SEM) were used for surface evaluation, and the adhesive remanent index (ARI) values were obtained and quantified.
One-way analysis of variance using Tukey's test was used to compare the differences among the groups.
A uniform distribution of nanoparticles occurred on the surfaces of brackets. The shear bond strength (SBS) showed no significant differences in any tested groups on days 1, 7, and 14. However, control and nBG showed a significant difference from nHA at day 30. On days 7, 14, and 30, the nHA group showed the highest SBS values among the groups. For ARI, most samples showed an adhesive nature of failure at the enamel-brackets interface. The images confirmed the presence of coated particles on brackets and remnants of adhesives after SBS.
This study confirmed that the nHA- and nBG-coated brackets have a high potential for application in orthodontics regarding structural and mechanical properties.
用两种不同的生物活性材料涂覆正畸托槽，并比较涂覆托槽与牙齿表面的机械性能和形态学特性。
总共120个不锈钢托槽被平均分为三组，即未涂覆的托槽、用旋转涂膜机涂覆纳米羟基磷灰石（nHA）的托槽以及涂覆纳米生物活性玻璃（nBG）的托槽。将托槽粘结在牙釉质表面，并在第1、7、14和30天进行再矿化/脱矿化循环。在每个时间间隔，使用机械加载评估托槽的粘结强度。使用光学显微镜和扫描电子显微镜（SEM）进行表面评估，并获得和量化粘结剂残留指数（ARI）值。
采用单因素方差分析和Tukey检验比较各组之间的差异。
纳米颗粒在托槽表面均匀分布。在第1、7和14天，任何测试组的剪切粘结强度（SBS）均无显著差异。然而，在第30天，对照组和nBG组与nHA组存在显著差异。在第7、14和30天，nHA组的SBS值在各组中最高。对于ARI，大多数样本在牙釉质-托槽界面显示为粘结性破坏。图像证实了托槽上存在涂覆颗粒以及SBS后粘结剂的残留。
本研究证实，就结构和机械性能而言，nHA和nBG涂覆的托槽在正畸学中具有很高的应用潜力。
