Department of Biomedical Engineering, College of Medicine, Kyung Hee University, Seoul, Republic of Korea.
Micron. 2010 Oct;41(7):775-82. doi: 10.1016/j.micron.2010.05.013. Epub 2010 Jun 1.
In orthodontics, the surface roughnesses of orthodontic archwire and brackets affect the effectiveness of arch-guided tooth movement, corrosion behavior, and the aesthetics of orthodontic components. Atomic force microscopy (AFM) measurements were used to provide quantitative information on the surface roughness of the orthodontic material. In this study, the changes in surface roughness of various orthodontic bracket slots before and after sliding movement of archwire in vitro and in vivo were observed through the utilization of AFM. Firstly, we characterized the surface of four types of brackets slots as follows: conventional stainless steel (Succes), conventional ceramic (Perfect), self-ligating stainless steel (Damon) and self-ligating ceramic (Clippy-C) brackets. Succes) and Damon brackets showed relatively smooth surfaces, while Perfect had the roughest surface among the four types of brackets used. Secondly, after in vitro sliding test with beta titanium wire in two conventional brackets (Succes and Perfect), there were significant increases in only stainless steel bracket, Succes. Thirdly, after clinical orthodontic treatment for a maximum of 2 years, the self-ligating stainless steel bracket, Damon, showed a significant increase in surface roughness. But self-ligating ceramic brackets, Clippy-C, represented less significant changes in roughness parameters than self-ligating stainless steel ones. Based on the results of the AFM measurements, it is suggested that the self-ligating ceramic bracket has great possibility to exhibit less friction and better biocompatibility than the other tested brackets. This implies that these bracket slots will aid in the effectiveness of arch-guided tooth movement.
在正畸学中，正畸弓丝和托槽的表面粗糙度会影响弓丝导向牙齿移动的效果、腐蚀行为和正畸部件的美观性。原子力显微镜（AFM）测量用于提供正畸材料表面粗糙度的定量信息。在这项研究中，通过使用 AFM 观察了体外和体内正畸弓丝滑动前后各种正畸托槽槽的表面粗糙度变化。首先，我们对四种类型的托槽槽的表面进行了特征描述：传统不锈钢（Succes）、传统陶瓷（Perfect）、自锁不锈钢（Damon）和自锁陶瓷（Clippy-C）托槽。Succes）和 Damon 托槽显示出相对较光滑的表面，而 Perfect 是四种类型的托槽中表面最粗糙的。其次，在两种传统托槽（Succes 和 Perfect）中用β钛丝进行体外滑动试验后，只有不锈钢托槽 Succes 的表面粗糙度有显著增加。第三，经过最长 2 年的临床正畸治疗，自锁不锈钢托槽 Damon 的表面粗糙度显著增加。但是，自锁陶瓷托槽 Clippy-C 的粗糙度参数变化比自锁不锈钢托槽小。基于 AFM 测量的结果，建议自锁陶瓷托槽比其他测试的托槽具有更小的摩擦和更好的生物相容性的可能性。这意味着这些托槽槽将有助于弓丝导向牙齿移动的有效性。
