Very large chin angle after lower jaw surgery 10 years ago. Can it be fixed by genioplasty? (Photo)

With a recessed and long chin I would recommend a reduction in the height of your chin and simultaneous advancement. You do not need further orthodontics and this surgery will not affect your bite. In order to improve the steep angle of your jaw, I would recommend custom jawline implants. Both together would produce a superior cosmetic result.

With your steep mandibular plane angle a sliding genioplasty will bring your chin forward and derotate the plane angle anteriorly. But to bring the jaw angle down this requires vertical lengthening jaw angle implants also for a more complete jawline change. Even further orthognathic surgery is not going to lower the jaw angles.

By the appearance of your photographs you will certainly benefited greatly from a rhinoplasty and also possibly a chin implant and/or genioplasty. I am confident that with your jewel surgery your occlusion is significant improved and would not need any more mandibular surgery. With the rhinoplasty your plastic surgeon can possibly add an extended chin implant that is less invasive and is going to prove your appearance