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AnchorsMakealltheDifferenceinSuccessfulOrthodonticTreatment

Orthodontics shares a principle with the classic tug of war game: if you want things to move in the right direction you need a good anchor. Anchors help braces and other appliances apply constant pressure to misaligned teeth in the direction they need to go to correct a malocclusion (poor bite).

Orthodontic treatments work in cooperation with an existing oral mechanism that already moves teeth naturally in response to biting forces or other environmental factors. The key to this mechanism is an elastic tissue known as the periodontal ligament that lies between the tooth and the bone. Besides holding teeth in place through tiny attached fibers, the ligament also allows the teeth to move in tiny increments.

Braces’ wires laced through brackets affixed to the teeth exert pressure on them in the desired direction of movement –the periodontal ligament and other structures do the rest. To maintain that pressure we need to attach them to an “anchor”—in basic malocclusions that’s usually the back molar teeth.

But not all malocclusions are that simple. Some may require moving only certain teeth while not moving their neighbors. Younger patients’ jaws and facial structures still under development may also need to be considered during orthodontic treatment. That’s why orthodontists have other anchorage methods to address these possible complications.

One example of an alternate anchorage is a headgear appliance that actually uses the patient’s skull as the anchor. The headgear consists of a strap running around the back of the head and attached in front to orthodontic brackets (usually on molar teeth). The pressure it exerts can trigger tooth movement, but it can also help influence jaw development if an upper or lower jaw is growing too far forward or back.

Another useful anchorage method is a tiny metal screw called a temporary anchorage device (TAD) that is implanted into the jawbone above the teeth through the gums. Orthodontists then attach elastic bands between implanted TADs and specific braces’ brackets or wires to exert pressure on certain teeth but not others with pinpoint accuracy. After treatment the TADs can be easily removed.

Using these and other appliances allows orthodontists to customize treatment to an individual patient’s particular malocclusion. With the right anchor, even the most complex bite problem can be transformed into a beautiful and healthy smile.

If you would like more information on orthodontic treatment, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor magazine article “Orthodontic Headgear & Other Anchorage Appliances.”

By Hockaday & Baucom, DDS
May 27, 2014
Category: Dental Procedures
Tags: orthodontics   tads  
TADsContributetoGreaterPrecisionDuringOrthodonticTreatment

The field of orthodontics continues to progress with new and innovative techniques. One such innovation is known as a TAD — Temporary Anchorage Device. Best described as “mini-implants,” TADs provide orthodontists with more precise control over the movement and positioning of certain teeth that could reduce treatment time.

Braces, the most common form of orthodontic device, are small brackets affixed to the outside of the teeth. We thread small flexible wires through the brackets which in turn apply gentle pressure to the teeth. This puts pressure on the periodontal ligament, an elastic tissue that holds the teeth in place to the jawbone. The ligament has small fibers that insert into the teeth and are held there by a substance called cementum. The pressure on the ligament causes it to form new bone, ligament and cementum as it moves into the new desired position.

Of course, each orthodontic case is different. The best outcome for some patients is to move only certain teeth, while minimizing movement on others. This involves a concept in orthodontics known as “anchorage,” a planned circumstance where certain teeth or groups of teeth are immobilized (or “anchored”) to prevent movement.

TADs do just that — they are, in effect, mini-screws or implants temporarily placed in the jaw bone to inhibit movement of a specific tooth or group of teeth, while not interfering with the movement of the misaligned teeth. These tiny devices are typically installed using only local anesthesia to numb the general location of their placement, and then removed when orthodontic treatment is completed.

TADs are part of an overall strategy to correct poor bite and teeth misalignment in the most precise and efficient way possible. They require planning, sometimes through consultation with different dental disciplines, to assure that their placement won’t damage nerves, sinuses or other vital structures. Their use, though, could help shorten treatment time with braces, and help contribute to the best possible outcome — a new smile.

If you would like more information on transitional mini implants, please contact us or schedule an appointment for a consultation. You can also learn more about this topic by reading the Dear Doctor magazine article “What are TADs?