Can a big chin implant shift while doing dental work such as braces and retainer molds?

5 months ago, I received surgery for a relatively large chin implant that caused my bottom lip to somewhat conceal my bottom row of teeth. Next week, I have scheduled an apptmnt, to have molds done for my retainers, but the problem is, is that I am afraid that the tool that they use to form the mold, may put pressure on my bottom lip and chin implant, causing pain and discomfort in the surgical area. Is it possible for it to shift because of this? *They also apply pressure for about 15 seconds.