dental midlines

Shift Your Bite Into High Gear

November 2nd, 2018

WHEN UPPER AND LOWER DENTAL MIDLINES do not line up and the lower jaw moves to the side on closing, these are signs of a bite functional shift.

When The Upper Arch Is Too Small For The Lower...

When the upper arch is too narrow or too small for the lower jaw, the lower jaw is forced to move to the side when closing. The unwanted movement, called a functional shift, temporarily relieves discomfort by creating a maximum tooth biting surface for chewing. The unnecessary jaw movement can be eliminated by upper arch expansion and comprehensive orthodontic treatment.

The Imbalance Can Be Fixed

The upper jaw may also be too small for the face and the lower jaw. This is called maxillary deficiency. The backward position of the upper jaw can be corrected with Class III rubber bands, reverse pull headgear, or an upper jaw surgical advancement procedure.

This case was treated by board certified orthodontist Dr. Ann Marie Gorczyca of Gorczyca Orthodontics in Antioch, California.

If you have questions about midlines that don’t line up or a jaw functional shift, call us at 925-757-9000. Visit us at

Straight dental midlines are important. Eliminate your bite functional shift to get your smile into high gear.

Top image used under CC0 Public Domain license. Image cropped and modified from original.
The content on this blog is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of qualified health providers with questions you may have regarding medical conditions.

Midlines Are the Tip of the Bite Iceberg

March 30th, 2015

DENTAL MIDLINES THAT DO NOT LINE UP are a sign that something much bigger is functionally off in a bite.

When midlines do not line up vertically in the center of the face between your upper and lower front teeth, often there is a major tooth position problem. This is frequently caused by loosing a baby tooth too early and teeth drifting forward into the space. This creates a major bite asymmetry.

Correcting Bite Asymmetry Protects Your Teeth

Bite asymmetry is usually corrected by comprehensive orthodontic treatment, which takes 24 months. Midline discrepancy or uncentered midlines can be treated with Class II or Class III elastics or by having a tooth extracted for an excellent orthodontic result. When tooth tips hit due to asymmetry, orthodontic correction will prevent teeth from being worn down prematurely in the future.

Whatever The Underlying Cause, Orthodontic Treatment Can Correct It

Other causes of midlines which do not line up are tooth size problems of a unilateral small tooth or jaw asymmetry. Both of these conditions can be fixed by comprehensive orthodontic treatment.

This case was treated by Board Certified Orthodontist Dr. Ann Marie Gorczyca, Antioch, California. Find us at or call us at (925) 757-9000 for a complimentary orthodontic exam.

Find out why your midlines are not centered. An uncentered midline is just the tip of the bite iceberg!

More Topics
diplomate american board of orthodontics Edward H. Angle Society of Orthodontists advanced education in orthdontics
member american association of orthodontists seattle study club american dental association california dental association
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