Tooth ankylosis is the fusion of the tooth to the bone, preventing
the tooth from erupting. This can happen in both primary ("baby")
teeth and permanent teeth, and may occur at any stage during
development or eruption. The cause of this condition is still
uncertain. Theories include trauma and heredity. An exam and
x-ray are the main diagnostic methods
for determining ankylosis. Some cases require surgical extractions
for orthodontic and functional purposes.