I've had some old fillings removed and some inlays put in to replace them, so I've lost track of what molds were for what purpose exactly, but at my last visit to the dentist they took a kind of impression that I'd never experienced before. Since it involved my upper teeth, it's a good guess that it was for the speed braces.
Measuring
The dental assistant put some goo on a really heavy piece of metal that was about the weight of a horseshoe (and about the same size!) and had me hold that up against my upper teeth. I liked this part; I like helping out. The worse part of a visit to the dentist for me is that I have to lay there like the victim of an alien probe, bright lights and weird music sending me into a helpless stupor.
Next, the dental assistant whipped out some halo contraption the size of the space shuttle launch pad and attached it the mouthpiece I was now steadily drooling all over. I was busy concentrating on not gagging, an act that I feared would send the mouthpiece hurtling across the room and possibly causing someone a serious head or leg injury.
The sides of the halo had extension pieces that the assistant put into my ears. Then shed did some tightening and adjusting at the top of the halo. She read the barometric measure, sent some signals into space, faxed in a lunch order - who knows?
The whole thing was over in just a few minutes. I'm happy to report that I didn't gag or injure anyone. And I hope we were able to contact some aliens as well.
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