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I'd imagine this idea has been explored before, but would it be possible to help palatal expansion by applying outward horizontal force along the sides of the piriform rim (i.e. nasal aperture) in conjunction with other forms of palatal expansion?
I would think that this additional force would help, since force would be applied from both *above* and *below* the palate, instead of just below. This would especially be useful in trying to promote growth along or splitting of the intermaxillary suture, as the force applied would concentrate above this area.
It's possible to palpate the piriform rim inside the nostrils. I've thought, what if there were a device that existed that could apply constant outward pressure against both sides of the rim that one could simply insert within the nostrils temporarily (no surgery). It would have to distribute the force over a wide enough area as to not pinch the soft tissue too much.