How Much Can Be Done To The Chin By A Sliding Genioplasty?
Q: Dr. Eppley, I am interested in a sliding genioplasty but want to know how much it can change the shape of the chin? What is the maximum vertical height and horizontal projection I can receive?
A: The maximum chin changes that can be achieved with a sliding genioplasty is based on the thickness of the chin bone, particularly as it relates to increased horizontal projection. You do not want to move the osteotomized chin bone beyond contact with the superior fixed chin bone. In general, that puts the advancement in the 10 to 12mm range which based on your picture seem more than you would need. As for vertical lengthening, the amount that the osteotomy can be opened depends on whether the created gap would need to be grafted. (with an hydroxyapatite block) For openings up to 5 or 6mm, no graft would be needed. But anything beyond that (8 to 10mms) would need to be grafted. Again, that distance seems greater than your picture would indicate that it is needed.
Dr. Barry Eppley