Anklyosis

Ankylosis is a dental condition that occurs when the small ligaments surrounding the roots of primary teeth are damaged and the roots become fused directly to the bone. Although we think trauma plays a part in causing ankylosis, the cause is not always known.  It is seen fairly often, especially in lower primary molars.

Ankylosis Can Cause Problems

When an ankylosed tooth is fused to the bone, it cannot erupt normally and will appear to sink into the jaw. The teeth on each side of the ankylosed tooth can lean into the gap formed and lose the space needed for the permanent tooth to grow into.  The ankylosis may also cause gum or periodontal disease because there is no way to clean under the leaning teeth.  The tooth opposite the ankylosed tooth can erupt too far (see figure 1). Finally, ankylosed primary teeth may block the normal growth of the permanent tooth because the roots will not dissolve normally (see figure 2).

How do we treat Ankylosis?

Ankylosed teeth usually fall out normally. However, if any of these problems are found, extracting the ankylosed tooth, possibly by an oral surgeon, is the usual treatment. When the ankylosed tooth is extracted depends upon the permanent tooth development and other factors so regular examinations and x-rays are necessary.