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Posted by: dadfa
« on: August 06, 2017, 07:51:32 pm »

Which type of expander would you guys recommend for someone who had wisdom teeth extractions with a recessed face, and a lack of lip support when smiling?  Would the modified expander give forward growth?

I would like forward growth and a wider smile.

I went to a dentist asking him if HE would use expanders on me, he refused, but was happy to take the $50 consultation fee.  So much for getting professional help.
Posted by: Progress
« on: August 01, 2017, 02:03:02 am »

Yes, I get it. I doubt it's possible. But that's just my guess. If you ask me, there is no reason not to aim for your genetic potential in terms of overall palatal width. Aesthetics should not have priority over health and function.
Posted by: Cat
« on: July 31, 2017, 07:28:28 am »

The prices are too much high, there must be something going on. We should stop buying the appliances to force them to cut on the prices.
Posted by: Progress
« on: July 31, 2017, 07:08:47 am »

I doubt it's possible to expand selectively like that. The suture is either wide enough to trigger new bone growth or it's not. The surrounding structure doesn't allow the palatal bones to tilt in a way that would enable one area of the suture to expand while leaving the rest intact. In this way the suture works like two pieces of wood glued and clamped together. You can break them apart by cracking the glue, but you can only do it fully, not partially because wood doesn't bend like that.

Quote
if the suture separating two bony elements is less than 250μm in width approximately, bone will be resorbed until the sutural width is restored. Similarly, if the sutural width is greater than about 250μm, bone will be deposited until the sutural width is maintained. The actual sutural width varies and is about 100-400μm 29, 30 at any one time. Note also that separation of cranial sutures by an expanding brain volume is associated with bone deposition. Thus, the notion of stretch or tension is implied in osteogenesis. It is interesting to note that the periodontal space on a periapical radiograph of a healthy tooth is usually around 0.25mm in width. As well, historically-speaking, in palatal expansion appliances the midline screw is turned by about 0.25mm

https://daks2k3a4ib2z.cloudfront.net/59419022ff1d4150cb0158a6/5947f6517d99a57e46b28e61_24.pdf
Posted by: Progress
« on: July 31, 2017, 03:40:35 am »

Quote from: anarqwin on July 31, 2017, 12:15:23 am
I'm also wondering if it's worth buying the one with 5 screws even though I would probably not use all of them. I just need a bit more of expansion in one side where there is some crowding, but maybe the middle expansion would fix it after all. Also, now the website is back selling it for 229,99 and it was 169,99 euros (60 euros more!). I wish there was competition or someone selling something similar to the expanders we hear it's better like the homeoblock, biobloc and so on... But I'm actually not sure if they are really better because sometimes I think that taking tongue space actually would allow for an even greater force from the tongue in the palate (if you are intentionally pressing) to expand upward than it would be able to do if the tongue was in a larger space and fully stretched. Someone please explain if I'm wrong but I think this is logical: if your tongue muscle is compressed in a small space, you can apply more force than if it's fully stretched, right? Just be sure to keep pressing the palate also when you take off the device and I guess it's all fine.

It's probably true to certain extent, but in the end the amount of force tongue can apply in any position is not a lot compared to the static pressure from a palate expander.

As for the additional screws, I have my own doubts about their usefulness for expansion. There's only one suture the palate can grow from, which is the mid-palatal suture. Anything that pushes and keeps the two halves of the palate apart from each other should do the trick. Additional screws won't provide additional benefit for expansion, but they may be helpful in guiding crowded teeth to a more optimal alignment during the expansion process.
Posted by: TheGreatWork
« on: July 28, 2017, 08:28:19 pm »

Pay closer attention to how the screws interact, they are not the same device.  The force vectors are applied in different directions depending on the order in which the screws are turned.

And it depends on the palate. Some may need even expansion across the whole palate, while others may only require force at the front or back of the palate.

So, for example, if the front of the palate/teeth are properly round and the palate caves inwards towards the rear teeth, then the modified expansion device would be unsuitable: It can not be used to expand at the rear without also expanding the front. The acrylic behind the canine teeth moves out just as far as the acrylic behind the molars.

Where as with, say, the Y plate one can expand the rear without moving the front, or also expand anterior forward while leaving the posterior as it is.

Use your tongue and how it fits in your mouth to see exactly where you need to put force.

Posted by: dadfa
« on: July 28, 2017, 08:24:49 pm »

I have been looking for the same answers for a long time.  I have asked various dentists online, and have emailed bracesshop and have not received any replies. 

From the looks of it appears you have to adjust all screws simultaneously.

This plate looks even better, because it appears it might cause forward growth. 

I would to hear if anyone has more details of this plate or experience.
Posted by: Brosem1987
« on: July 28, 2017, 05:19:06 pm »

Is the modified stretching plate t he same as the active plate but with just a few more screw if you need them?

Or is the functionality different?

I'm under the impression it's the same with more function, but maybe if you don't need need the extra screws you can just use the middle standard screw and use it just like the active plate?

I figure it's better to pay a little more money and have more function if you need it as opposed to need more and having to buy another device.

Does this sound right?  I might not use the "extra" screws, but if I need them I might.

Thanks