Regarding BSSO advancement of the mandible, we really don't speak in terms of 'shape' or change of shape of it. That's because advancement is really an elongation from where they make the cut to advance (near back of 2ncd molar) to a point to the chin. In effect, there has been a DISTANCE INCREASE to lets say; 'ALONG THE JAW LINE'. Rotation to the maxilla done with the BSSO changes the ORIENTATION of the mandible. So, basically, they are working with what ever mandible 'SHAPE' you start with and 'displacing' its position.
So, what you need to get an IDEA ABOUT are the basic concepts associated with the type of surgery you are requesting, eg. here, language/terms to use to demonstrate you understand the difference between changes of SHAPE of the mandible from changes in ORIENTATION.
Thanks, this is useful. I didn't actually bring any of this up with him but I most certainly will in September when I fly back. You are correct, I meant that with CCW the orientation of the body of the mandible will change slightly with respect to the ramus, but to a lesser degree with less posterior downgrafting of the maxilla. He also mentioned that with BSSO the width of the mandible at the back will appear wider due to it being slightly thicker at the back than the front.
Basically, if you want to 'talk turkey' with a SURGEON with reference to mm exactitude, he/she most likely would not engage in the absence of your reflecting conceptual understanding of the WHOLE thing and how the part you are asking about relates to it. I mean the discussion about the change of ONE thing, is relative to a surgery that can change MANY OTHER things than the one thing you are asking about.
I understand this. He was actually enthusiastic during the consultation in explaining the science/technical aspects of the movements I did ask about. But I will try to remain as specific as possible in future to avoid any miscommunications.
The ortho could give a 'ceph analysis'. BUt it is the SURGEON who does a ceph DISPLACEMENT proposal (based on the ceph analysis) which is basically the PLAN of the surgery to be done.
So, in terms of getting ideas about things, there is a difference between a ceph analysis and ceph displacement proposal which uses the ceph analysis as the BASE LINE for the displacement proposal.
Understood.
In essence, it looks like your surgeon is holding contingent that you present with a KNOWN baseline (as to the position of your teeth after braces are used to move them) before he comes up with a SURGICAL PLAN. That's because a surgical plan is contingent on where the teeth actually are. So, in effect contingent on getting the ortho first when the GOAL of the ortho is to HAVE the surgery.
With regard to other patients getting the displacement proposal aka surgical plan, they are usually committed to GETTING the surgery where as in your case, you seem to be wanting to decide whether you should get surgery OR just get ortho to fix your bite.
If the ortho cannot correct my bite, then I will certainly move forward with surgery. I just want some idea of what osteotomies/movements of my jaws and chin will be likely before I commit to an ortho in another country, in case decide to have surgery done elsewhere by someone else.
So, your goal of having surgery is not really clear to the guy, especially so if you are consulting to decide whether or not you should have the surgery OR to just fix your bite in ABSENCE of any surgery.
My first surgeon in 2012 concluded that "The study models are not true orthodontic models but it is not possible to get a good class 1 occlusion on the left even after moving the models so that the upper and lower midlines are coincident. If he wishes to correct the occlusion and appearance he would need a combination of orthodontics and surgery".
I entered this consultation with the assumption that I needed jaw surgery based on my previous surgeons findings. Dr. Birbe recommended that I consult with one of his orthodontists first to see if orthodonics can be employed. I suppose my surgery would be primarily functional. The aesthetic improvements I want are improved left-right symmetry and an improvement in my profile (I have a convex profile).
Are you implying that the importance of the consultation is essentially finding out the competency of the surgeon and that they can perform the specific kinds of osteotomies you wish?
For example, hypothetically, if someone had zero knowledge of jaw surgery consulted with a surgeon and agreed to get braces to fix a severe underbite, but then when the time came to provide a surgical plan, the surgeon's plan included ONLY advancing the maxilla forward and not setting the mandible back. If the patient didn't agree with such a plan, could they get another surgical plan/suggestion/ceph analysis done elsewhere by another surgeon? Is this not something that should be discussed as a likelihood prior to the orthodontics? I guess my point is, I've seen people suggest getting surgical plans from some of the big names, and then asking more affordable local surgeons to carry out the procedure; but this seems like it wouldn't be possible in the case where you only get even a semblance of a plan after you commit to months of orthodontics with your surgeon.
I apologise if this seems obvious to you and don't expect you to take time out of your day to walk anyone through any of this, I just want to fully understand this process.
Even though I have been on these forums since 2012 I am still relatively new to the whole consultation process and just want to ensure I understand everything correctly.
My PRACTICAL advice is this:
IF you want to know if your bite can be fixed WITHOUT surgery, find that out from an ortho NOT associated with this surgeon (or a few orthos if you like). The answer is probably; 'yes'.
See above advice from previous surgeon.
That information alone will allow you to then decide whether to have surgery to move the jaws for 'aesthetic reasons'. In which case, you would need to forgo the option of ortho ONLY to fix your bite and instead commit to having what ever ortho needed to have FOR the surgery you want when the surgeon NEEDS to KNOW where the teeth actually ARE inorder to do a displacement proposal surgical plan.
Thanks man.