You can try it and see. The problem is a fixed support is infinitely stiff. That is why I suggested a layer of bone to isolate the implant from the fixed support.
Maybe what the journal does is only report the stress in the green and gray parts, and excludes the stress in the brown and blue parts. If you do that there is no singularity in the reported stress. It is in the brown part which you are ignoring. That is another way to do it.