you could probably get away without braces, but like everything with jaw surgery, it is to what degree of exactness to your goal that you want to get. Like the Poster above said, you could just get staight linear advancement and call it a day.The ultimate way to do it (may not be worth the hassle for you) is to get braces put in (most will need this to move your jaw anyways, esp if there is rotation), and then afterwards they can tweak your bite with the braces that are in place as nobody can predict 100% the mm of movement until after surgery. straight linear advancement may have facial changes, so be aware of that.