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Okay that's what I wanted to verify. A one piece would be a marred interface with a broken screw. The OP picture is a failed cold weld.Not from what I understand from what I've heard. The mill the entire abutment at once (top cap all the way to the interface). Not like purchasing pre-milled blanks with the interface already manufactured on it. This is unverified information though. Just from what I've heard. Please take that into consideration as well.
And if it was 100% true about Atlantis being totally milled, and an abutment looked like the OP picture, then lab would have some explaining to do as it would be counterfeit.
That's why I was trying to determine if you had 100% knowledge on that fact.
Two ways things go bad. Manufacturing defect or Lab is using "same as" parts for convenience and profit.
I also got a report last week the same "sheer" on Zimmer platform/ Atlantis abutment. So that's two of this happening in the past year in my town. Different labs, different offices.