Page 19 - Directions for the manipulation of the Gysi adaptable articulator

15 As each condyle comes forward during these movements, the pencil opposite it will trace a definite line, as in illustration No. il. But on the return of the condyle to the position of rest, the line is both different and less certain. If the glasses have been kept in contact with the pencils, a few movements of this kind will suffice to trace a legible path. The Lateral Path Register is then removed, the paths made by the condyles in moving forward are strengthened a little with a pencil, the resting point of the condyle is marked on each path, and the entire Lateral Register laid aside for future measurements of the inclinations of these paths. Some patients have such poor control over the movements of the mandible, that the efforts to trace a path on the lateral path register, will be unsuccessful. They register such a multiplicity of lines and in such different directions, that no definite paths can be determined. These conditions may result from the loss of the teeth on one side of the mouth long before they were lost on the other, or be- cause all the teeth have been out so long that the articulation of 111. No. 13. The forward and downward movements of the con- dyles are recorded by the horizontal pencils of the Condyle Path Register. The ends of the pencils are placed opposite the condyle heads, a card is held against the face with its lower edge parallel with the broad plate of the Register, and the The mandible is caused to exercise its different movements. movements of one condyle at a time are thus recorded.