Shahabi Mostafa, Salari Soheil, Poosti Maryam, Abtahi Mostafa
Department of Orthodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Orthodontics, Aja University of Medical Science, Tehran, Iran.
Dent Res J (Isfahan). 2017 Nov-Dec;14(6):412-417. doi: 10.4103/1735-3327.218567.
During sliding mechanics, the frictional force (FF) is an important counterforce to orthodontic tooth movement. The purpose of this study was to investigate the static and kinetic FFs of S silica-insert ceramic (SIC) brackets with Teflon-coated (TC) and conventional S stainless steel (SS) archwires.
The target group of this study included 80 maxillary canine 0.022 inch slot SIC brackets. Forty SS brackets were used as the control. TC and conventional uncoated SS archwires of different dimensions (0.016, 0.018, 0.016 × 0.022, and 0.018 × 0.025 inch) were examined. All tests were carried out under artificial saliva injected condition. Scanning Electron Micrographs were prepared for two samples of coated and uncoated archwires. Analysis of variance and Tukey tests were used for statistical purposes (level of significance < 0.05).
SIC brackets showed significantly lower levels of FFs than SS brackets. TC archwires had greater frictional values than conventional uncoated ones. They also exhibited an unusual behavior of increasing kinetic FFs with time. Indentation and delamination of coating were obvious under scanning electron microscopy observations.
From the standpoint of friction, SIC brackets may serve well, even better than SS brackets, in sliding mechanics. The coating layer of the archwires may delaminate and lost, causing an impediment to tooth movement.
在滑动矫治力学中，摩擦力是正畸牙齿移动的重要反作用力。本研究的目的是研究带有聚四氟乙烯涂层（TC）的S型含硅陶瓷（SIC）托槽与传统S型不锈钢（SS）弓丝之间的静摩擦力和动摩擦力。
本研究的目标组包括80个上颌尖牙0.022英寸槽沟的SIC托槽。40个SS托槽用作对照。检测了不同尺寸（0.016、0.018、0.016×0.022和0.018×0.025英寸）的TC和传统未涂层SS弓丝。所有测试均在注入人工唾液的条件下进行。对涂层和未涂层弓丝的两个样本制备扫描电子显微镜图像。方差分析和Tukey检验用于统计学分析（显著性水平<0.05）。
SIC托槽显示出的摩擦力水平显著低于SS托槽。TC弓丝的摩擦值高于传统未涂层弓丝。它们还表现出动摩擦力随时间增加的异常行为。在扫描电子显微镜观察下，涂层的压痕和分层明显。
从摩擦的角度来看，SIC托槽在滑动矫治力学中可能表现良好，甚至比SS托槽更好。弓丝的涂层可能会分层并脱落，从而阻碍牙齿移动。
