Replacing premolars after regretted extraction and braces?

I have read everything that "tooth975" has said about reversing traditional orthodontic work by expanding the jaws sideways and forwards (very helpful!). From what I understand, in the upper jaw you can move the jaw forwards with functional appliances to open the extraction spaces but how is this... show more I have read everything that "tooth975" has said about reversing traditional orthodontic work by expanding the jaws sideways and forwards (very helpful!). From what I understand, in the upper jaw you can move the jaw forwards with functional appliances to open the extraction spaces but how is this accomplished in the lower jaw? Would it be possible to replace the bicuspids in the lower jaw as well?

Also, can functional orthodontics pull an impacted wisdom tooth up to make it useable?
Update: In case I wasn't clear enough I was talking about implants.
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