Page 20 - Directions for the manipulation of the Gysi adaptable articulator

16 the condyle with the surface of the fossa becomes indefinite, or because patients have worn such poorly articulated artificial den- tures that the natural definite movements have been destroyed and other definite movements have not been induced. For such cases, it will be satisfactory if the use of the lateral path register is disregarded anei the lateral inclination of the arti- ficial glenoid fossa be set at 15 , as indicated by the markings on the horizontal plate. The pencil holders are now turned so that the points of the horizontal pencils are directly opposite the heads of the condyles. A card having at least one straight side, is held against the face with the straight edge parallel with the broad horizontal plates of the Condyle Path Register, as in illustration No. 13. The pencil holder is moved inward toward the card by means of the rack and pinion provided for that purpose, until the spring behind the pencil is about half compressed. The patient is then In- structed to make opening and closing or lateral movements. Dur- ing its forward and downward movement, the condyle will trace a fairly definite path, but on its return movements It may wander (Fioui The Dental Cos.iios.) 111. No. 14. Analysis of rig^ht and left condyle paths as secured by the method shown in Fig. 13. C, Condyle path. L. Left. A^, Right. Oi\ Plane of occlusion. 3 5*-^, Ang-le of middle part of path to plane of occlusion. ;'. Resting- position of condyle. /^^ , Path of condyle in a right lateral movement. Z,\ The same in a left lateral movement, o. Forward bite or wide opening and closing movement. over several Indefinite courses. When the record made by the for- ward movement is sufficiently legible, the card may be removed, the path slightly strengthened by a pencil mark, and the resting point of the condyle marked. The card should now^ be held against the other side of the face. In the same way, and the tracing made on the same side. The form of a typical condyle path Is show^n In Illustration No. 14.