8.3  Occlusive guidance and anomalies of the development of teeth.

① Occlusive guidance

Keypoints:

1.The concept of occlusive guidance: 

      The dental clinic methods that guide the permanent teeth to erupt to the normal and functional occlusal positions.

2.Space regain: 

       Segmental fixed appliance,coil spring to open the closed space.

②Anomalies of the development of teeth

Keypoints:

1.Anomalies of number：

          A.Hyperdontia:

    An excess in tooth number that can occur in both the primary and permanent dentitions;

B.Hypodontia:

    Congenital tooth absence, a deficiency in tooth number.

2.Anomalies of size;

3.Anomalies of shape;

4.Anomalies of structure:

        ●Enamel；

        ●Cementum；

5.Anomalies of replacements of teeth;

       ●Detained primary teeth;

●Ankyloses of permanent teeth;

●Ectopic eruption of upper first molars;

●Diastema;