Control of upper incisor torque

In June 2000, Fasllight" presented a discussion on the facial 'tetragon' consisting of the following four angles:

• Upper incisor to palatal plane

• Lower incisor to mandibular plane

• Inter-incisal angle

• Maxillary/mandibular plane angle (Fig. 7.22).

Fig. 7.23 Triangle formed from the upper part of Fastlight's tetragon.

X.

Fig. 7.23 Triangle formed from the upper part of Fastlight's tetragon.

Fig. 7.24 Triangle formed from the lower part of Fastlight's tetragon.

The lower triangle has angles as follows:

• Mandibular plane to occlusal plane

• Lower incisors to occlusal plane

• Lower incisors to mandibular plane (Tig. 7.24).

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