thanks a lot!
how short would you say my maxilla is? Not sure what the proper way to measure would be, is this dependent on the soft tissue? Also what does low angle (MPA) patient mean?
And would you say I don't need genio to make my mandible longer then? He said he would move my chin a bit forward instead of down, this was odd to me but like you said with BSSO maybe it changes the appearance of the chin also
Also would you say that in my case the ramus is not too short? Because I think if I were to push for downgrafting it might give me a pointy face so idk if maybe trying to make my face longer would end up making me look worst because of my short ramus, ofc I am not even sure that I have a short maxilla so maybe worrying about this is silly?
The MPA (mandibular plane angle) is formed by the line of the mandibular border and a horizontal plane; the angle of inclination that the line of the mandible has with a horizontal. Suffice to say (and REPEAT) the salient point is that you don't need any type of rotation.
DISCLOSURE: I find it meaningless to describe things that relate to basic geometrical relationships if a poster does not have good grounding in basic geometry.
You have a short face where the shortness is found in the middle '1/3rd'. The way to increase that shortness and to increase the facial height is via a uniform graft to the maxilla.
DISCLOSURE: I do not discuss exact mm measures as in how short or how long or 'how much'. Suffice to say that shortness was found to the face and that is consistent with a suggestion for a downgraft that has NO ROTATION which would be a uniform downgraft.
Even IF someone has a low MPA, the 'line' of the mandible is still in a DOWNWARD DIAGONAL direction. So, when the mandible is moved 'forward' along it's MPA the direction is outward and down. Those are the 2 directional displacement vectors. Hence the chin gets displaced with the BSSO and moves both horizontally forward and vertically down because it's being moved 'forward' along a downward diagonal. So, you will also get length to the face via the mandibular 'forward' displacement.
DISCLOSURE: Again, to understand what I said above, you would need to already have under your belt very basic math grounding; geometry and basic understanding of what a 'directional displacement vectors' are with regard to displacement along a DIAGONAL DIRECTION.
IN CLOSING: The observations I made and relayed in my prior post are consistent with what the surgeon relayed to you. As to what is 'DEPENDENT' on what, being able to understand what is going on with maxfax displacements and my explanations thereof (no matter what they are) depends on the poster asking questions to have some very basic math grounding under belt to relate my answers to.