Feather margin as I know it, is just a margin that the Dentist has done very little to prep it. Under a microscope you will see the bur marks, it's very faint. Usually straight up and down with the axial wall. It doesn't flare out like a chamfer and isn't noticeable like a beveled margin and no where near a shoulder margin. Hope this helps, I'll find ya prep description and post it for ya.
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