Page 16 - Nonextraction therapy Old Is Gold

• In 1941," the concept of lower incisor position

was introduced as subjective attempt to create

fixed dentocranial relationship.

• In 1946," he abandoned this relationship and

substituted relationship of the mandibular

incisors to the inferior border of the mandible.

• He then added the Frankfort plane to form the

Frankfort- mandibular plane angle.

• He proposed that “virtually all cases showing

Frankfort-mandibular plane angle of 28 to 35

degrees will require removal of teeth.”