Skeletal overjet about 8mm
Dental overjet 1 mm
Am interested in BSSO to correct skeletal discrepancy but am wondering if there are any alternatives to extracting teeth in order to dentally decompensate prior to surgery?
TIA.
You can advance the mandible via Counterclockwise rotation of the entire maxillo mandibular complex (MMC) without any dental overjet. However, to get any meaningful advancement mm wise, this changes your appearance drastically and requires a good surgeon (stability).
I remember your picture from another posting, and I don't think you are a candidate for aggressive roation. If you post a lateral x-ray, I can be more specific, but if memory serves me right you are a low angle patient (brachycephalic growth pattern with increased pogonion projection, forward and upward rotation of the mandible on a class 2 skeleton).
This would only leave clockwise rotation, as your MMC is already counterclockwise rotated by nature (brachycephalic pattern). CW rotation lengthens the face. AFAIR you have a short midface, CW rotation would give you a longer lower third. Also, CW rotation rotates the mandible downwards which negates part of the advancement you are getting from the surgery, so it is doubtful that the surgeon would be able to produce a good result.
I think the choice in your case is to either go with the conventional surgical plan (extractions to decompensate the lower jaw) or forego surgery altogether.