The rods were biomechanically tested with a push-out test and observed for histomorphometry to evaluate the microscopic bone to implant ratio. For in vivo study, coated rods were inserted into the distal femur of the rabbit and then harvested. Cellular proliferation was validated with ELISA, immunofluorescent assay. Cellular morphology was observed with a scanning electron microscope. Methodįor in vitro study, human osteoblast cells were seeded onto the coated surfaces. For this, we compared characteristics of titanium-coated surfaces created by direct metal fabrication method (DMF) and titanium plasma spraying (TPS), both in vitro and in vivo, for (1) cell morphology, (2) confocal microscopy images of immunofluorescent assay of RUNX2 and fibronectin, (3) quantification of cell proliferation rate, (4) push-out biomechanical test, and (5) bone histomorphometry. We hypothesized that this would yield a coated surface quality as acceptable or better than the already established method of plasma spraying. In our study, we utilized additive manufacturing with a 3D printing called direct metal fabrication (DMF) and compared it to the plasma spraying method (TPS), to coat titanium onto CoCr alloy. Creating such a coated surface takes a challenging process and two dissimilar metals are not easily welded. In conclusion, while cobalt chrome itself isn’t magnetic due to its composition - which typically consists of chromium, cobalt, and sometimes tungsten/molybdenum - adding cobalt to stainless steel can make the steel magnetic.Titanium surface coating on cobalt-chromium (CoCr) alloy has characteristics desirable for an orthopedic implant as follows: strength, osteointegrative capability, and biocompatibility. In that case, you should avoid putting it near strong magnets like those found in speakers or stereo systems since the powerful magnetic fields may disrupt the watch’s movement - resulting in incorrect time readings or even damage to the watch components themselves! The same goes for other items made out of cobalt chrome, such as prosthetic joints: they should be kept away from strong magnets to prevent disruption and damage to their internal components. For example, suppose you have a watch made with cobalt chrome. Effects of Magnetism on Cobalt ChromeĮven though cobalt chrome isn’t magnetic, it can still be affected by magnets when used near them. In jewelry specifically, though, cobalt chrome itself will not attract a magnet since it does not contain any iron-based alloys. This type of stainless steel is known as “cobalt-bearing stainless steel” and can be found in many everyday items such as fridge magnets, knives, scissors, coins, and more. Is Cobalt Chrome Magnetic?Ĭobalt chrome is not magnetic however, adding cobalt to stainless steel can make it magnetic. Cobalt chrome is also popular for jewelry because it looks like white gold or silver but doesn’t require maintenance like other precious metals. It also has a high melting point, meaning it won’t warp or deform under extremely hot temperatures. It’s often used in medical implants such as hip replacements because it’s resistant to corrosion and wear. What is Cobalt Chrome?Ĭobalt chrome is an alloy of chromium, cobalt, and sometimes tungsten or molybdenum. Cobalt chrome is a popular metal alloy for jewelry and prosthetics, but what about its magnetic properties? Does cobalt chrome have any effect on a magnet? In this blog, we’ll answer that question and discuss cobalt chrome’s composition and how it affects its magnetism.
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