How far apart should the upper and lower incisors be?

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shutmymouth
Posts: 45
Joined: Sat Feb 26, 2011 8:10 am

How far apart should the upper and lower incisors be?

#1 Post by shutmymouth » Wed Jun 01, 2011 11:17 am

For some reason it appears that my jaw may have been moved too far forward. I fully realize that there maybe room for my orthodontist too tilt my central and lateral incisors back some. The question is when everything is done how should your upper and lower teeth fit together? My lower front teeth don’t touch my upper teeth at all. I’ve been trying to bite into things and while my ability to bite into food has improved in comparison to before (went from only using one tooth on the side to using all of my front teeth.) I notice that I still cannot bite through my food completely. My back teeth are virtually fully clenched and the food does not break away. I wind up doing some sort of gnawing action.

I have found that if I move my lower jaw forward I am able to cut through my teeth quite nicely. Is this normal, am I supposed to move my lower jaw forward when biting into food? Or should I be able to just use a basic up and down action with the lower jaw to properly “cut” into my food with my teeth.

TIA

shutmymouth
Posts: 45
Joined: Sat Feb 26, 2011 8:10 am

Re: How far apart should the upper and lower incisors be?

#2 Post by shutmymouth » Thu Jun 02, 2011 10:10 pm

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Here are some pics of my new bite.

Since I dont know what a proper bite is supposed to look like I was wondering if yall could tell me if this is right.

I know I have some straightening to go but will the Ortho be able to fix my bite more? Or is this essentially my final bite?

LAJaw
Posts: 83
Joined: Wed Dec 16, 2009 7:17 pm
Location: Southern California

Re: How far apart should the upper and lower incisors be?

#3 Post by LAJaw » Fri Jun 03, 2011 10:25 am

Your incisors should be touching. My understanding is that surgeons give underbite patients a bit of an overbite on purpose to anticipate relapse. Everyone relapses to a certain degree as the bone fracture knits and firms up. The overbite is small enough your ortho should have no problems correcting it.

I think I had my surgery about a month behind you and my bite is really similar to yours with a 1-2 mm gap between top and bottom incisors. My ortho mentioned that he will correct it, but first he is getting my molars to touch properly.
Uppers braced April 15, 2010.
Wisdom teeth extracted April 30, 2010.
Lowers braced May 12, 2010.
BSSO & 3-piece LeFort I April 22, 2011.
Braces off July 3, 2012!!
My surgery blog: http://jeremiahjaw.wordpress.com

chicago29
Posts: 734
Joined: Tue Jul 22, 2008 12:34 pm
Location: Chicago Suburbs, IL

Re: How far apart should the upper and lower incisors be?

#4 Post by chicago29 » Mon Jun 06, 2011 7:14 am

Your bite is extremely good...Your top and bottom teeth shouldn't touch at all. The normal is 1 to 3 mm of "overjet".
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LAJaw
Posts: 83
Joined: Wed Dec 16, 2009 7:17 pm
Location: Southern California

Re: How far apart should the upper and lower incisors be?

#5 Post by LAJaw » Mon Jun 06, 2011 11:13 pm

I"m a little confused - if your incisors don't touch how can you properly bite something thin? When I had my underbite I couldn't bite through certain foods because they were smaller than the gap in my underjet. Wouldn't the same thing happen with thin foods in an overjet?
Uppers braced April 15, 2010.
Wisdom teeth extracted April 30, 2010.
Lowers braced May 12, 2010.
BSSO & 3-piece LeFort I April 22, 2011.
Braces off July 3, 2012!!
My surgery blog: http://jeremiahjaw.wordpress.com

Ronniexo
Posts: 3
Joined: Mon Jun 06, 2011 11:19 pm

Re: How far apart should the upper and lower incisors be?

#6 Post by Ronniexo » Tue Jun 07, 2011 12:09 am

LAJaw wrote:
> Your incisors should be touching. My understanding is that surgeons give underbite
> patients a bit of an overbite on purpose to anticipate relapse. Everyone relapses
> to a certain degree as the bone fracture knits and firms up. The overbite is small
> enough your ortho should have no problems correcting it.
>
> I think I had my surgery about a month behind you and my bite is really similar to
> yours with a 1-2 mm gap between top and bottom incisors. My ortho mentioned that
> he will correct it, but first he is getting my molars to touch properly.


I have the exact same problem. I got my braces off a month ago & my top jaw is clearly too dominant. Was that something that the ortho was supposed to fix? My bite looks a lot like her bite except even less of my bottom teeth are now visible. My top jaw needs to go back :(

qwertz1
Posts: 144
Joined: Fri Mar 26, 2010 2:21 pm

Re: How far apart should the upper and lower incisors be?

#7 Post by qwertz1 » Tue Jun 07, 2011 12:37 pm

LAJaw wrote:I"m a little confused - if your incisors don't touch how can you properly bite something thin? When I had my underbite I couldn't bite through certain foods because they were smaller than the gap in my underjet. Wouldn't the same thing happen with thin foods in an overjet?
there can be an overjet and your incissors can touch at the same time, see for example here:
Image

but according to my orthodontist, it is not necessary that they do touch when you bite into your molars.
has anyone else asked their orthodontist about this? just wanna make sure mine isnt just trying to save time.

LAJaw
Posts: 83
Joined: Wed Dec 16, 2009 7:17 pm
Location: Southern California

Re: How far apart should the upper and lower incisors be?

#8 Post by LAJaw » Tue Jun 07, 2011 1:30 pm

Qwertz, thanks for the picture. I didn't realize you could have an overjet/underjet and also have a closed bite.
Uppers braced April 15, 2010.
Wisdom teeth extracted April 30, 2010.
Lowers braced May 12, 2010.
BSSO & 3-piece LeFort I April 22, 2011.
Braces off July 3, 2012!!
My surgery blog: http://jeremiahjaw.wordpress.com

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