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Pakicel
Fuchsia
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Yeah it is a lot. But check this thread from realself:10-12 mm seems like a lot , considering the average chin height is slightly above 2 cm.
BiMax is considered more or less safe to perform. I think , that genio Isn't cope for people with short head (brachycephalic) like mine

How much vertical length can a sliding genioplasty add to my chin?
Hey i want a taller and more masculine chin. I thought sliding genioplasty might be right for this. I've read that vertical increases from 10 to 12mm's are...

Eppley's response:
"A 10 to 12mm vertical increase would be common in many cases of vertical chin lengthening. The vertical bony gap created is filled with an interpositional allogeneic bone graft. If you want to aesthetically know how much vertical chin lengthening you need, open your mouth and set the chin where its length looks good to you…and then measure the distance between your front teeth. That distance will be how much your chin needs to be vertically lengthened to achieve you aesthetic goals."
I don't think you need that much vertical length and even then it won't make as much difference as you think. I guess you might improve 0.25-0.5 PSL from genio. Genio isn't cope for you as your jaws are well developed just a bit deficient vertically. It's a cope for people with legitimate recession. It still improves them just not to the extent bimax does.