Dental braces are not a comfortable thing to have. If you have a temporary crown and braces then things can get even more uncomfortable. The crown and temporary crown should not interfere with the braces though.
My advice is to consult an orthodontist ~ in many cases an open bite can be corrected with braces, in more severe cases orthognathic surgery may be needed (which is not as bad as it sounds, it is virtually painless and a common procedure). I recommend searching online for support groups if surgery is the diagnosis; you'll be able to have all your questions and concerns answered there. Yahoo has some excellent groups.
In any case, it's important to wear your retainer as specified after your braces come off, otherwise your teeth will most likely go back to their original postition. , and good luck!
I'm sorry that I can't answer your question but I can't help but to share that I too have a lisp - though it has only been one day and I've been crying my eyes out all day because my lisp is really bad and the language I speak most of the time (not English) has a lot of "s" sound, which makes the lisp extremely noticeable. I've done some research on the web as I'm sure you have - seems like the only thing you can to about the lisp is to keep practicing the words you can't pronounce ... what a pain.
Actually, I disagree with the official answer because if you had researched, majority of the answers say that your lips would go away within a few days. When I first got my retainers, I thought that I would never speak the same way again, but I did and my mouth got use to the extra plastic in it.
Don't worry, you will be able to speak normally again. :]
Well I believe you do have to get spacers before braces. The spacers are used to separate, or space out, the teeth. Where these spacers are, the bands for your braces will go.
I didn't have to get spacers before my braces.