In an genioplasty for moving forward the chin: What are the chances of losing sensitivity and movement of the lip? (Photos)

Genioplasty surgery is a procedure where a portion of your natural chin is moved forward and secured with a miniplate and screws. It is a very safe procedure and the risks of this procedure involves a sensory nerve. There is a small risk of decreased sensation following the procedure but this is usually transient. The nerve that moves your lip is a motor nerve and should not be affected by this surgery. The risk of infection following genioplasty is extremely low.... in 27 years I have never seen an infection following this procedure. Good luck

The risks of nerve injury in a sliding genioplasty are related to the mental nerve not the facial nerve. This is a nerve that controls the feeling to the lower lip and chin not the movement of the lower lip. Some temporary numbness of the lower lip due to a stretch on this nerve on common and most patients go on to a full feeling recovery. 

Any surgery has risks, and a genioplasty is no exception. Since the cuts that are made in the bone are near the mental nerve foramen, there is a risk of loss of lip sensation. There will certainly be transient numbness immediately after the surgery, especially with swelling, but that typically resolves over several weeks. Be sure to seek consultation with an experienced board certified plastic surgeon who is experienced in maxillofacial surgery and who performs osteotomies regularly.  Good luck!