The biggest problem with wisdom teeth like yours, Neko - and I had them like that too - is that they're impossible to keep completely clean. So at some point, they'll start to rot, and then break or get infected, which makes things worse (trust me, you don't want them going in to get out the shards of a shattered one).
Get them out while they're in one piece, or at the latest, at the very first sign of trouble. I had all of mine into my 30's, but by the time I was in my mid 40's, they were all gone.
On MRI's: At children's hospital in Pittsburgh, they give the kid a helmet that has goggles and headphones, and let them watch a movie during the MRI. After strapping them down, of course.