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Mostly just feel strong pressure on cheekbones
There is another study/lecture where I learned that the primary point of resistance against forward maxillary movement is the zygomatic buttress. This is where you get the "I feel it in my cheekbones" resistance when you really get the posture and force down correctly. You might feel it alternatively on the outside of your cheekbones or on the interior near the nose.
This resistance point is also the rotational hinge point in growth. If you push the maxilla directly against it, it grows forward. If you push from underneath, you have counterclockwise rotation, and vice-versa. This is from maxillary protraction facemask studies (bone anchored).
@krollic That's what I used to feel when I only engaged anterior tongue.
When I fully engaged posterior tongue to the point of blocking my airway, making a snoring/grunting/coffee machine type sound, that's when I started feeling compressive force in cheekbones/zygos and sometimes near nose and eyes. Just saying, I wasn't properly engaging my posterior tongue for longer than I'd like to admit.
so youre saying you need a big palate to have a upswung maxilla? and people with narrow palates have downswung maxillas?
You can translate a wide and narrow palate into unfolfed palate (flat -> upswung) and folded palate ( vaulted-> downswung) palate.
To give you an idea, form and arch with your index and thumb and widen and shrink them . The length of the arch stays the same but height changes.
The wide and shorter palate allows the mandible to upswing