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Kraken
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All of these things must happen for the condition to qualify for this
It probably is a symptom of poor maxilla growth, which would mean accompanied with a recessed looking upper maxilla too and little eye socket space so bulgy eyes.
For example dicaprio has recessed upper maxilla and short back maxilla, but he's saved by his short front maxilla, that way his gonial angle is NOT trash and his chin not recessed. His maxilla isn't that recessed so his eyes don't bulge out.
For recessed chin to occur, you typically need high gonial angle, which means shorter ramus - back of the maxilla relative to the front length of the face aka front maxilla.
John Mew explains it here, but he doesn't really explain why it happens in ALL cases. He mentions people with receded chins have had their mouth open so their faces got too long.
That doesn't explain why people with short faces have recessed chins.
Take a look at the red arrow: what would happen if the back of the maxilla was even shorter?
less eye socket space an indicator for poor upper maxillary growth along with the typical recessed maxilla symptoms, aka recessed nose bridge, infraorbitals, and cheekbones. Another issue would be shit bigonial width since short distance between the TMJ and the bottom gonions caused by short back of the maxilla would FORCE the ramus to develop inwards because it has nowhere else to go.
Here's a straight ramus
Notice the distance between the eye socket and the bottom of his jaw. His eye socket - upper wisdom teeth distance isn't short otherwise his ramus would become shorter and his gonial angle would increase.
A shorter eye socket - upper wisdom teeth distance would require the back of the mandible to go up decreasing the absolute distance and the bigonial distance.
TLDR: How do we know gravity is always the reason of high gonial angle, recessed chin (long front maxilla causing it) and NOT bad upper/inner maxillary growth (normal front maxilla; but SHORT back of the maxilla). Spoiler
we don't.
This a hypothesis - not established theory and it isn't mine.
Here's a post mentioning it with the intention of fixing it through inner maxilla pulling
It probably is a symptom of poor maxilla growth, which would mean accompanied with a recessed looking upper maxilla too and little eye socket space so bulgy eyes.
For example dicaprio has recessed upper maxilla and short back maxilla, but he's saved by his short front maxilla, that way his gonial angle is NOT trash and his chin not recessed. His maxilla isn't that recessed so his eyes don't bulge out.
For recessed chin to occur, you typically need high gonial angle, which means shorter ramus - back of the maxilla relative to the front length of the face aka front maxilla.
John Mew explains it here, but he doesn't really explain why it happens in ALL cases. He mentions people with receded chins have had their mouth open so their faces got too long.
That doesn't explain why people with short faces have recessed chins.
Take a look at the red arrow: what would happen if the back of the maxilla was even shorter?
less eye socket space an indicator for poor upper maxillary growth along with the typical recessed maxilla symptoms, aka recessed nose bridge, infraorbitals, and cheekbones. Another issue would be shit bigonial width since short distance between the TMJ and the bottom gonions caused by short back of the maxilla would FORCE the ramus to develop inwards because it has nowhere else to go.
Here's a straight ramus
Notice the distance between the eye socket and the bottom of his jaw. His eye socket - upper wisdom teeth distance isn't short otherwise his ramus would become shorter and his gonial angle would increase.
A shorter eye socket - upper wisdom teeth distance would require the back of the mandible to go up decreasing the absolute distance and the bigonial distance.
TLDR: How do we know gravity is always the reason of high gonial angle, recessed chin (long front maxilla causing it) and NOT bad upper/inner maxillary growth (normal front maxilla; but SHORT back of the maxilla). Spoiler
we don't.
This a hypothesis - not established theory and it isn't mine.
Here's a post mentioning it with the intention of fixing it through inner maxilla pulling