Rao Srinivasa B, Chowdhary Ramesh
Department of Prosthodontics, Mamata Dental College and Hospital, Khammam 507002, India.
Int J Dent. 2011;2011:397029. doi: 10.1155/2011/397029. Epub 2011 Mar 3.
Dental casting alloys are widely used in contact with oral tissue for many years now. With the development of new dental alloys over the past 15 years, many questions remain unanswered about their biologic safety. Concepts and current issues concerning the response to the biologic effects of dental casting alloys are presented. In this paper, samples of three commercially available nickel-chrome (Ni-cr) casting alloys (Dentaurum, Bego, Sankin) were taken to assess their corrosion behavior, using potentiodynamic polarization method (electrochemical method) with fusayama artificial saliva as an electrolyte medium to check for their biocompatibility. The parameters for corrosion rate and corrosion resistance were obtained from computer-controlled corrosion schematic instrument, namely, potentiostat through corrosion software (power CV). The results obtained were analyzed by classic Tafel analysis. Statistical analysis was done by Student's t-test and ANOVA test. It was concluded that Dentarum and Bego showed satisfactory corrosive behavior, with exception of Sankin which depicted higher corrosion rate and least resistance to corrosion. Thus, the selection of an alloy should be made on the basis of corrosion resistance and biologic data from dental manufactures.
牙科铸造合金多年来一直广泛用于与口腔组织接触。在过去15年中，随着新型牙科合金的发展，关于其生物安全性仍有许多问题未得到解答。本文介绍了有关牙科铸造合金生物效应反应的概念和当前问题。在本文中，采用动电位极化法（电化学方法），以扶桑人工唾液为电解质介质，对三种市售镍铬（Ni-cr）铸造合金（Dentaurum、Bego、Sankin）的样品进行腐蚀行为评估，以检查其生物相容性。腐蚀速率和耐腐蚀性参数由计算机控制的腐蚀原理图仪器，即通过腐蚀软件（功率循环伏安法）的恒电位仪获得。通过经典的塔菲尔分析对所得结果进行分析。采用学生t检验和方差分析进行统计分析。得出的结论是，Dentarum和Bego表现出令人满意的腐蚀行为，Sankin除外，其腐蚀速率较高且耐腐蚀性最低。因此，合金的选择应基于牙科制造商提供的耐腐蚀性和生物数据。
