The corrosive effects of artificial saliva on cast and rapid manufacture-produced cobalt chromium alloys
The corrosive effects of artificial saliva on cast and rapid manufacture-produced cobalt chromium alloys
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DOI：
10.1108/13552541311302941
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Williams, R. J.
中科院分区：
文献类型：
--
作者：
Alifui-Segbaya, Frank;Foley, Paul;Williams, R. J.
目的-快速铸造生产的钴铬合金开始用于牙科，但很少有关于其性能的公开结果。本文的目的是确定快速铸造生产的牙科合金的耐腐蚀性，并将其与标准牙科铸造合金进行比较。设计/方法/途径-按照ISO 22674，每种合金的10个样品制成约45 mm x 10 mm x 2 mm的矩形棱柱，样品数量超过标准要求。这些组被进一步分为具有高度抛光表面的组和具有电增亮表面的组。每个样本都浸入人工唾液中，用尼龙线在37摄氏度下悬挂42天。钴，铬和钼离子释放到解决方案中的读数，获得使用原子吸收光谱仪在1，4，7，14，21，28，35，和42天的时间间隔在检测限的百万分之一。与上述金属相比，合金可安全用作牙科器械。然而，快速制造合金表现更好。此外，数据表明，对于这两种合金，有没有明显的差异之间的抛光和电光亮surfaces.Originality/值-快速制造合金的研究表明，根据ISO定义的钴，铬和钼的耐腐蚀性的安全水平。建议进行进一步的生物相容性试验。
Purpose - Rapid manufacture-produced cobalt chromium alloys are beginning to be used in dentistry but there are few published results relating to their properties. The purpose of this paper is to determine the corrosion resistance of a rapid manufacture-produced dental alloy and compare it to a standard dental casting alloy.Design/methodology/approach - In accordance with ISO 22674, ten samples of each alloy were fabricated in approximately 45 mm x 10 mm x 2 mm rectangular prisms, a sample number in excess of the standard requirements. The groups were further divided into those with highly polished surfaces and those with electrobrightened surfaces. Each sample was immersed in artificial saliva, suspended by a nylon thread for 42 days at 37 degrees C. Readings for cobalt, chromium and molybdenum ions released into solutions were obtained using an atomic absorption spectrometer at 1, 4, 7, 14, 21, 28, 35, and 42 day intervals at a detection limit of one part per million.Findings - Ion release of cobalt, chromium and molybdenum was well within the threshold prescribed by the standard. The alloys were safe for use as dental devices with respect to the above metals. The rapid manufacture alloy however performed better. In addition the data indicated that for both alloys, there was no discernable difference between a polished and an electrobrightened surface.Originality/value - The rapid manufacture alloy studied shows a safe level of corrosion resistance with respect to cobalt, chromium and molybdenum according to ISO definitions. Further biocompatibility tests are recommended.