Sliding genioplasty with hyperactive mentalis - Will an implant cause bone erosion? (photo)

The amount of recession in your case is significant and I prefer the sliding genioplasty in cases like this. Generally, the lip incompetence is improved and there is less hyperactivity of the mentalis muscle. Chin implants do sometimes cause a settling effect on the bone and there can be some bone resorption.

When the lips 'strain' to touch / close; the best approach is always a genioplasty. Yes, the pressure from the lip strain/closure will alter the implant position as you noted and also not deal with the increased vertical height of the chin itself