yussimania
Surgery, Roids and Raw Milk
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i might be wrong on this so feel free to correct me please
basically i've been having dreams and thoughts recently to wrap my head around rotation
i think the reason we see people ascend frontally is less to do with rotation - the most important thing is a solid downgraft and a big mandibular body advancement - specifically the genioplasty part which will affect your JFA and LAFH the most due to movement in both saggital and transverse planes
gonial angle changes are limited you will never achieve a "rotational morph" where the entire MMC rotates due to OP limits and the type of cut for the bsso and lefort
the standard cut for bsso is the type C. this is anterior to the ramus and gonion which are key landmarks to the gonial angle. so now we need to change the relationship between the gonion and the menton however normal advancement with the standard few degrees of rotation won't change the MPA and thus gonial angle
so here is my idea; go big or go home. the more advancement you have the longer the lever and therefore wider the arc it travels during rotation. so if someone has severe sfs and class 2 - a large advancement of say 20mm at the pogonion will yield far greater rotational results than your basic bsso for your standard recession. by this logic we can see peoples gonial angles actually change for once
note the step off at the highlighted area due to the CWR - the gonial angle now has improved greatly increasing his LAFH
but if we advance too much you risk being antefaced - remember we want the convexity profile (pog-subnasale-nasion or glabella) at around 180° +- 5°
if your MPA and OP are close together then you will have some benefits with rotation - for example downswung people with a downward tilted MPA and OP when they have a bsso with CCW impaction their MPA will generally improve and theoretically will improve the gonial angle - however this is theoretical as I haven't personally seen a result yet
edit: I've only talked about hypodivergent patterns here not hyperdivergent since I myself am one
basically i've been having dreams and thoughts recently to wrap my head around rotation
i think the reason we see people ascend frontally is less to do with rotation - the most important thing is a solid downgraft and a big mandibular body advancement - specifically the genioplasty part which will affect your JFA and LAFH the most due to movement in both saggital and transverse planes
gonial angle changes are limited you will never achieve a "rotational morph" where the entire MMC rotates due to OP limits and the type of cut for the bsso and lefort
the standard cut for bsso is the type C. this is anterior to the ramus and gonion which are key landmarks to the gonial angle. so now we need to change the relationship between the gonion and the menton however normal advancement with the standard few degrees of rotation won't change the MPA and thus gonial angle
so here is my idea; go big or go home. the more advancement you have the longer the lever and therefore wider the arc it travels during rotation. so if someone has severe sfs and class 2 - a large advancement of say 20mm at the pogonion will yield far greater rotational results than your basic bsso for your standard recession. by this logic we can see peoples gonial angles actually change for once
note the step off at the highlighted area due to the CWR - the gonial angle now has improved greatly increasing his LAFH
but if we advance too much you risk being antefaced - remember we want the convexity profile (pog-subnasale-nasion or glabella) at around 180° +- 5°
if your MPA and OP are close together then you will have some benefits with rotation - for example downswung people with a downward tilted MPA and OP when they have a bsso with CCW impaction their MPA will generally improve and theoretically will improve the gonial angle - however this is theoretical as I haven't personally seen a result yet
edit: I've only talked about hypodivergent patterns here not hyperdivergent since I myself am one
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