Ok very useful presentation of how bone cutting and shaving can be used together in these v-line procedures. Thanks! Again, learned something new.
Also I think for OP the blue statement at the end is important!
Raya, check the statement in blue by kavan in the picture.
.... It would not call for another bone cutting surgery.
You are a very good recipient for learning.
As to the (basic) 'V line' surgery, I go by the KOREAN approach in which they use basic geometrical concepts to change the shape of one figure to another which involves planning types of cuts to displace/remove bone. For the most part, they use sharp cutting instruments for the main shape and reserve burring and/or shaving to later 'round out' residual (or unwanted angularity). I mention that because some surgeons call what they do 'V line' but it is NOT the Korean approach.
Korean approach resolves to solving this basic geometric question which is:
Q: 'Given the wide and blunt chin contour in scull 'a', HOW would you get to the contour of scull 'd' using cuts and bone displacement/removal. Also, WHEN would burring/shaving be used?
A: 'Via a horizontal cut through the (wide) chin and 2 vertical cuts below, spaced a distance apart equal to the excess width. Remove middle segment and move the lateral segments inward to close the gap. Then a straight line diagonal cut from the 'step-off' to the back of the jaw angle. Burring would be reserved for rounding out residual angularity to the posterior jaw for a more (overall) 'rounded' V contour IF all angularity to mandible were to be removed.
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Now, as to the after scull scan, the surgeon was tasked with UNDOING an overly shortened chin (and calling it a 'V line). Except for the scalloping on right side of PHOTO, as you pointed out, that could be camouflaged with some soft tissue filler.