Abstract
T HE angulator is a simple device for measuring, directly on the head of the patient, the Frankfort-mandibular plane angle for orthodontic diagnosis. It gives the measurements immediately-they can be read on the protractor which is part of the instrument,. It will also give the distance from the tragion to the point where the Frankfort and mandibular planes intercept each other somewhere behind the head. Dr. Tweed was the first to describe the importance of this angle in orthodontics. The Frankfort-mandibular plane angle is somewhere in back of the head, formed by the intersection of the Frankfort plane which is aligned from the orbitale to the tragion with a plane tangent to the lower border of the body of the mandible.
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