Department of Biomedical Engineering and Healthcare Industry Research Institute, College of Medicine, Kyung Hee University, Seoul, Republic of Korea.
J Microsc. 2012 Apr;246(1):53-9. doi: 10.1111/j.1365-2818.2011.03586.x. Epub 2011 Dec 20.
In orthodontic treatment, the frictional force between the archwire and bracket reduces the effectiveness of orthodontic treatment. The frictional force is affected not only by the geometry of the self-ligating brackets but also by physical changes between the bracket slots and archwire surfaces during sliding movement. This study examined quantitatively the effect of self-ligating treatments on the surfaces of stainless steel (SS) archwires during tooth movement in vivo by atomic force microscopy. Orthodontic 0.019″ × 0.025″ SS archwires after clinical use with the first bicuspid-extraction treatment were employed using the Damon 3MX(®) SS self-ligating brackets, Clippy-C(®) ceramic self-ligating brackets, and Kosaka(®) SS brackets. Intact SS archwires were used as the control group. All SS archwires after clinical use showed severe scratches and significantly higher roughness caused by frictional interactions between the brackets and archwires (p < 0.0001 vs. control). The descending order of surface roughness was the SS archwires treated, with ceramic self-ligating brackets, with conventional SS brackets, and with SS self-ligating brackets (p < 0.001). These findings suggest that an orthodontic treatment with SS self-ligating brackets may require smaller orthodontic forces than that with ceramic self-ligating brackets or conventional SS brackets.
在正畸治疗中，弓丝和托槽之间的摩擦力会降低正畸治疗的效果。摩擦力不仅受自锁托槽的几何形状影响，还受滑动过程中托槽槽沟和弓丝表面之间的物理变化影响。本研究通过原子力显微镜定量研究了在体内牙齿移动过程中自锁托槽治疗对不锈钢（SS）弓丝表面的影响。使用 Damon 3MX(®) SS 自锁托槽、Clippy-C(®)陶瓷自锁托槽和 Kosaka(®) SS 托槽对接受第一双尖牙拔牙治疗的临床使用后的 0.019″×0.025″ SS 弓丝进行研究。将完整的 SS 弓丝作为对照组。所有临床使用后的 SS 弓丝均显示出严重的划痕，并且由于托槽和弓丝之间的摩擦相互作用导致粗糙度明显增加（p<0.0001 与对照组相比）。表面粗糙度的降序排列为：陶瓷自锁托槽治疗的 SS 弓丝、传统 SS 托槽治疗的 SS 弓丝和 SS 自锁托槽治疗的 SS 弓丝（p<0.001）。这些发现表明，与陶瓷自锁托槽或传统 SS 托槽相比，使用 SS 自锁托槽的正畸治疗可能需要较小的正畸力。
