4. Ankylosed deciduous teeth and disturbed eruption
4. Ankylosed deciduous teeth and disturbed eruption
| Ankylosis in this context means the fusion of dental
hard tissue, cement and dentine with alveolar bone with accompanied by
loss of soft tissue. In most cases, however, it does not involve the whole
periodontal ligament; single bone bridges in the periodontal ligament suffice
to disturb the normal vertical development of the tooth in comparison to
its unaffected neighbouring teeth. As long as the vertical discrepancy
of a single or even all deciduous teeth does not exceed 2 to 3 mm, there
is no clinical relevance. But if a deciduous tooth reoccludates into bony
structure up to the level or even below the gingiva, the successor is always
involved.
The lower second milk molars are affected most frequently, in the permanent dentition a single or all first molars can show signs of ankylosis. If more permanent teeth of the buccal segment are affected, this is defined as a general disturbance of the periodontal tissue. The prognosis for active elongation of ankylosed teeth is uncertain or poor . |
Examples:
Ankylosed 55,56
Ankylosis all primary
molars
Ankylosed 85 with disturbed
eruption of 45
Submerged 55 with impaction
of 15
Examples for permanent teeth: