Feather Margins?

[Baker]

Can someone explain what a feather margin is and how to do one.

Thanx guys..

[TheLabGuy]

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.

[TheLabGuy]

Here is a picture for you, the first one is a feather edge margin, second is a chamfer, third is a shoulder. Hope this helps.
Picture>>>>> http://www.prestige-dental.co.uk/product_images/398.jpg

[sixonice]

I can also throw in the feather (also called "slice" margins by some) margins are unacceptable for pretty much ANY all-ceramic restoration including zirconia. The computers have a very tough time reading feather preps & they are not strong enough. Any pressed all-ceramic is also difficult because during the divesting process the margins can get chipped or blasted off.

[Baker]

thank you Lab guy / Sixonice. I will share this with my father. The picture will help for he is more hands on/visual, than a read and learn kind of guy.
Thanx again for your knowledge on this subject of feather margins.