Frictional and mechanical properties of diamond-like carbon-coated orthodontic brackets
Frictional and mechanical properties of diamond-like carbon-coated orthodontic brackets
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DOI：
10.1093/ejo/cjr113
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发表时间：
2013-04-01
影响因子：
2.6
通讯作者：
Mizoguchi, Itaru
中科院分区：
文献类型：
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作者：
Muguruma, Takeshi;Iijima, Masahiro;Mizoguchi, Itaru
本研究研究了类金刚石涂层对正畸托槽摩擦性能和力学性能的影响。在两种不同的大气条件下，采用等离子体离子注入/沉积（PBIID）方法在不锈钢支架上沉积DLC薄膜。已接收的金属支架作为控制。采用两种尺寸的不锈钢拱丝，直径为0.018英寸，截面尺寸为0.017 x 0.025英寸，通过机械试验机（n = 10）将拱丝穿过支架槽，测量静摩擦和动摩擦。用扫描电子显微镜（SEM）对dlc涂层支架进行观察。通过纳米压痕测试获得硬度和弹性模量（n = 10）。摩擦力比较采用单因素方差分析和Scheffe检验。采用Kruskal-Wallis检验和Mann-Whitney u检验比较支架的硬度和弹性模量。SEM显微照片显示，支架表面的DLC层厚度约为5-7 μ m。对于截面尺寸为0.017 x 0.025英寸的不锈钢丝，条件2下沉积的DLC涂层支架的静摩擦力明显小于条件1下沉积的DLC涂层支架，尽管条件1下沉积的DLC涂层支架的动摩擦力明显小于条件1下沉积的DLC涂层支架。DLC层的硬度远远高于接收支架表面的硬度。综上所述，通过PBIID方法可以成功修饰金属支架表面形成DLC层，并且DLC涂层工艺显著降低了摩擦力。
This study investigated the effects of a diamond-like carbon (DLC) coating on frictional and mechanical properties of orthodontic brackets. DLC films were deposited on stainless steel brackets using the plasma-based ion implantation/deposition (PBIID) method under two different atmospheric conditions. As-received metal brackets served as the control. Two sizes of stainless steel archwires, 0.018 inch diameter and 0.017 x 0.025 inch cross-section dimensions, were used for measuring static and kinetic friction by drawing the archwires through the bracket slots, using a mechanical testing machine (n = 10). The DLC-coated brackets were observed with a scanning electron microscope (SEM). Values of hardness and elastic modulus were obtained by nanoindentation testing (n = 10). Friction forces were compared by one-way analysis of variance and the Scheffe test. The hardness and elastic modulus of the brackets were compared using Kruskal-Wallis and Mann-Whitney U-tests. SEM photomicrographs showed DLC layers on the bracket surfaces with thickness of approximately 5-7 mu m. DLC-coated brackets deposited under condition 2 showed significantly less static frictional force for the stainless steel wire with 0.017 x 0.025 inch cross-section dimensions than as-received brackets and DLC-coated brackets deposited under condition 1, although both DLC-coated brackets showed significantly less kinetic frictional force than as-received brackets. The hardness of the DLC layers was much higher than that of the as-received bracket surfaces. In conclusion, the surfaces of metal brackets can be successfully modified by the PBIID method to create a DLC layer, and the DLC-coating process significantly reduces frictional forces.