Perfy and Codysweet02
Two great questions. The shield I refer to is a .8 mm acrylic layer that is sandwiched between the inner and outer layers of the mouthguards. The shield has two functions. One function,due to it's rigidity,is stabilization of materials within the guard (partially reducing flex) and power redistribution to transfer force throughout the guard.(redirecting the energy)
As for a mouthguard that is thicker in the rear than it is in the front, well....that would not vry functional or protective. If it were thicker in the rear the front teeth wouldn't touch the guard. Sure you would have a breathing channel but you would also have an open bite leaving your front lower teeth and lips to impact and injury. It's important that all teeth make contact with the guard when in the mouth.
Unless your teeth are overly crowded right now, taking out your wisdom teeth will have little effect on your teeth or position. Wisdom teeth can cause overcrowding of teeth because there is not enough room in the mouth for all the teeth. Since they come in last they have a tendancy to push thier way in and crowd the rest of the teeth. Also you would need orthodontia (braces) to effectively make drastic changes in the position of your teeth. So... the answer is no. You don't have to wait.