Develop a Gap Between my Teeth After Two Separate Crowns on Front Teeth? (photo)

I would like to see you have two separate crowns.  I can't see a reason why you would want to have them attached.  This would make it more difficult to floss.  Make sure that the crowns are all porcelain (metal free) and that they are bonded to your teeth rather than traditionally cemented.  

Your teeth shouldn't move unless your bite contact is heavy. If it is, the light/hard tapping continuously over time may move one or both. Also if gaps are left inbetween any of the teeth, the space will allow some movement.