You can widen the mandible by making an osteotomy down the middle of the chin. I'm not sure if that is the effect you are going for, but it is possible.
That would be basically the same as using distraction osteogensis to widen the mandible then, right? I have actually considered that however it looks as though DO or indeed a BSSO in that fashion would simply widen the entire mandible both anteriorly and posteriorly. Unfortunately I could never find too much info, however the cut down the centre of the chin made it appear as though the entire jaw would be widened. I had hoped that there may be a method, possibly one still involving an osteotomy down the middle of the chin, that would expand the posterior parts of the mandible outwards whilst leaving the rest relatively in tact. See my terrible image below for a better idea of what I mean
Probably ignore the blue lines if you want. Think of it more as the two posterior parts of the mandible and rami rotating outwards around the chin. From an aesthetic point of view I imagine that this would give more of a V-shape to the jaw as opposed to a wider U-shape that would occur if all parts of the mandible were being laterally extended.
Does that make any sense at all? Is such a thing possible?
I'm just trying to look at options other than HA paste as I'd much rather try and make the actual mandible larger without the use of foreign objects to give that illusion.