Author Topic: Can Maxillary Protraction Cause Class II Malocclusion? (Read 319 times)

reenochrobinson · « **on:** July 29, 2017, 06:54:49 pm »

I understand the theory that once you advance the maxilla up and forward, the mandible swings up to meet it, and it has been suggested that once you expand the upper arch, the lower arch is able to expand automatically. What I'm wondering is if this is actually true in practice or if protracting and expanding the maxilla can cause a malocclusion. I was watching "The President Show" on Comedy Central and Carole Radziwill was a guest (photo: http://www.allaboutthetea.com/wp-content/uploads/2014/05/The-Real-Housewives-of-New-York-City-Photos-Recap-Ramona-a-Banquet-and-Some-Issues.clipular-2.jpg). I admired her prominent zygomas, cheek hollows, wide upper arch, and facial convexity. However, her upper arch clearly protrudes beyond her lower arch. Is there a chance efforts to expand and protract the maxilla could achieve the kind of results we see in her midface, but also cause this kind of malocclusion? It seems logical that a protraction headgear could cause an overjet if conventional orthodontics use a retraction headgear to correct an overjet.

Progress · « **Reply #1 on:** July 30, 2017, 02:21:16 am »

You're looking at a face that has undergone plastic surgery. Her face does not have a great structure in my opinion. Look at how far down the teeth are in comparison to the eyes. In an ideal face, drawing a triangle with two corners at the outer edges of the eyes and one corner at the tip of the incisors would result close to an equilateral triangle. Her face is longer than that. In the rare pics where she actually smiles wide, her smile is gummy. Not a sign of a well developed face.

reenochrobinson · « **Reply #2 on:** July 30, 2017, 12:48:09 pm »

Thanks Progress! I wasn't trying to suggest that her facial structure is ideal. What I'm curious about is how you get a mix of some features which seem to be exemplary like her wide upper arch, prominent cheekbones, and cheek hollows, but these are mismatched with other undesirable characteristics. Especially in this interview, I was noticing the protrusion of her upper arch significantly beyond her lower arch. I agree with your assessment that she has a long face and a slightly gummy smile. Maybe you are right that some of this incongruity results from cosmetic surgery, although it looks like many of the same features are present in that "before" picture you posted. It just seems like if you were practicing the proper postural habits to achieve the good features, it would also have improved the bad features. Maybe it's something like good oral posture during your developmental years but then starting to mouth breath and slouch as an adult causes that "melting" quality away from an initially well-developed structure?

Progress · « **Reply #3 on:** July 30, 2017, 03:03:38 pm »

That is a good question and one that I've spent time thinking about too. Your last sentence is probably close to the reality of the situation. Given the numerous sutures of the skull, there should be many unique ways improper and proper growth could manifest and be combined in any sub-optimally developed face. One could have a wide palate but a downswung mid-face, whereas someone else may have a properly positioned maxilla but narrow palate etc. Then there's the age factor. Recession that begins in childhood is probably going to turn out differently than recession that begins after most of the growth is done.

As for your question about whether expanding the palate could cause overjet, I doubt it. Overjet seems to be a problem that stems from some kind of structural recession. Expansion or forward movement of the maxilla should lessen it in most cases. Conventional orthodontists use retractive treatments to correct overjet because they focus on the teeth, disregarding the structural root of the problem. It's essentially a band-aid solution

Break the Matrix

News:

Author Topic: Can Maxillary Protraction Cause Class II Malocclusion? (Read 319 times)

reenochrobinson

Can Maxillary Protraction Cause Class II Malocclusion?

Progress

Re: Can Maxillary Protraction Cause Class II Malocclusion?

reenochrobinson

Re: Can Maxillary Protraction Cause Class II Malocclusion?

Progress

Re: Can Maxillary Protraction Cause Class II Malocclusion?