Keith O, Jones S P, Davies E H
Department of Orthodontics, University of North Carolina, Chapel Hill 27599-7450.
Br J Orthod. 1993 May;20(2):109-15. doi: 10.1179/bjo.20.2.109.
Planar static frictional phenomena were investigated for two types of ceramic and one type of stainless steel orthodontic bracket against rectangular stainless steel archwire. The brackets studied were 'Starfire' (single crystal aluminium oxide), 'Allure III' (polycrystalline aluminium oxide), and 'Dentaurum' (stainless steel). The investigative parameters were: bracket material, force of ligation and whether the brackets were new or 'worn'. Without exception, both types of ceramic bracket produced greater frictional resistance than the stainless steel brackets throughout testing. At a ligation force of 500 g, the Starfire bracket gave the greatest frictional resistance. At ligation forces of 200 and 50 g, the greatest frictional resistance was seen with Allure III. After a period of simulated wear, frictional resistance of Starfire tended to increase at the greatest ligation load while that of both ceramics decreased slightly at the two lower ligation loads. The ceramic brackets caused abrasive wear of the archwire surfaces and the consequent wear debris may have contributed to the changes in frictional resistance seen with Starfire and Allure III. Dentaurum brackets produced minimal frictional resistance in any test and negligible change with wear.
研究了两种陶瓷正畸托槽和一种不锈钢正畸托槽与矩形不锈钢弓丝之间的平面静摩擦现象。所研究的托槽分别是“星火”（单晶氧化铝）、“魅力III”（多晶氧化铝）和“登泰克”（不锈钢）。研究参数包括：托槽材料、结扎力以及托槽是新的还是“磨损的”。在整个测试过程中，两种陶瓷托槽无一例外都比不锈钢托槽产生更大的摩擦阻力。在结扎力为500克时，“星火”托槽产生的摩擦阻力最大。在结扎力为200克和50克时，“魅力III”托槽产生的摩擦阻力最大。经过一段时间的模拟磨损后，在最大结扎负荷下，“星火”托槽的摩擦阻力趋于增加，而在两个较低结扎负荷下，两种陶瓷托槽的摩擦阻力均略有下降。陶瓷托槽导致弓丝表面出现磨料磨损，由此产生的磨损碎屑可能是“星火”和“魅力III”托槽摩擦阻力变化的原因。在任何测试中，“登泰克”托槽产生的摩擦阻力最小，且磨损后变化可忽略不计。
