ok Kavan understood,but one last more question regarding my problem,you stated the downgraft is limited by the tooth show.
you told something about ,also what tooth show when my lips slightly parted.Then , it is very limitted tooth show about 1-2 mm,only when I smile and ,then also ,let s say half of the teeth.
So could be a 10 mm downgraft?
The middle third is elongated too ?that overall downgraft is made to mandible too?
Also how could be a surgical plan ceph?Should I ask him to draw on ceph what will he do?
Thank you and excuse me if I repeated some questions.
Downgraft limited by tooth show:
LIMITATION refers to ONE thing that LIMITS the extent of what you can do with ANOTHER thing when both things are RELATED to each other. One thing will LIMIT how much you can maximize another thing. Think basic high school math concept of simple functions where functions Can Be Inversely related or Directly related. So the extent of how much you can increase facial height with a downgraft is proportional to the degree of tooth show. Maximum tooth show will minimize the extent of how much you can increase facial height with the downgraft and minimum tooth show will maximize the the extent of how much you can increase facial height with the downgraft.
The fundamental relationship between tooth show and the extent of a down graft is this:
The MORE the tooth show the LESS thickness the graft can have and therefore the less overall increase in facial height can be achieved with it. The LESS the tooth show the MORE the thickness the graft can have and therefore the more overall increase in facial height can be achieved with it.
To SIMPLIFY further, take the example of a of an overall downgraft of uniform thickness where it's the same thickness to the front of the maxilla as to the back of it; same thickness THROUGHOUT the entire maxilla (which includes the middle part too). The maximum thickness it can have (to increase facial height) is LIMITED by the tooth show.
So, IF 'X'mm EXTRA tooth show than one already had was needed, thickness limitation would be 'X'mm.
As to what is 'X' for you, that is something the doctor would need to determine by doing the appropriate measurements. I just go over the fundamental conceptual relationships and grasping thereof.
Downgrafts and discussions thereof apply to the MAXILLA.
Cephs TRACINGS are done on a CEPH. From there, a PLAN is drafted as to the DISPLACEMENTS to be done. Proposed DISPLACEMENTS of the JAWS are illustrated on the ceph tracing by a CONTOUR diagram that gives a visual of the proposed profile contour.
If you lack a fundamental grounding in basic geometrical and simple math relationship functions, there will be no base line understanding for you to relate concepts in maxfax to.
ETA: Ave. Crown length of maxilla incisor is about 10.5mm. Average gum show above teeth when smiling is about 2-3mm but not more than 3mm. Average upper incisor toot show at rest is about 2mm.