Sorensen J A, Engelman M J, Daher T, Caputo A A
University of California, School of Dentistry, Los Angeles.
J Prosthet Dent. 1990 Jun;63(6):630-7. doi: 10.1016/0022-3913(90)90318-7.
Heat treatment during the burnout procedure may cause corrosion of the stainless steel post. This study was undertaken to determine whether alteration of the corrosion resistance of stainless steel posts occurs as a result of various simulated burnout procedures. Stainless steel posts were divided into five groups of five posts: group 1, control; 2, gypsum-bonded investment, bench cooled; 3, gypsum-bonded investment, quenched; 4, phosphate-bonded investment, bench cooled; and 5, phosphate-bonded investment, quenched. The posts were placed in individual containers of Ringer's solution and observed at 30, 180, and 600 days. Scanning electron microscopy, energy dispersive x-ray spectroscopy, optical emission spectroscopy, and optical microscopy were used to evaluate the posts qualitatively and quantitatively. Investment and heat treatment altered the metallic structure of stainless steel posts. Prefabricated posts submitted to simulated burnout procedures had a noticeable reduction in corrosion resistance. Direct casting to stainless steel posts is contraindicated.
在除蜡过程中进行热处理可能会导致不锈钢桩腐蚀。本研究旨在确定各种模拟除蜡程序是否会导致不锈钢桩的耐腐蚀性发生改变。将不锈钢桩分为五组，每组五根桩：第1组为对照组；第2组为石膏粘结包埋料，常温冷却；第3组为石膏粘结包埋料，淬火；第4组为磷酸盐粘结包埋料，常温冷却；第5组为磷酸盐粘结包埋料，淬火。将桩置于林格氏液的单独容器中，并在30天、180天和600天时进行观察。使用扫描电子显微镜、能量色散X射线光谱、光发射光谱和光学显微镜对桩进行定性和定量评估。包埋料和热处理改变了不锈钢桩的金属结构。经过模拟除蜡程序的预制桩的耐腐蚀性明显降低。禁忌直接铸造不锈钢桩。
