Page 8 - Directions for the manipulation of the Gysi adaptable articulator

plate supported thus. When the base plate is returned to the model, it will rest on the hard plaster and a false relationship between model and base plate will be established, which may cause the ulti- mate failure of the denture. The lower base plate should be made in the same manner. A wire may well be inserted all around the lingual aspect of this base plate to prevent warping. Shaping The Trial Plates The Trial Plates are the base plates with the wax ridges added. A wax ridge is shaped on each base plate. This is done by heat- ing a sheet of baseplate wax on one side till it is nearly ready to run, folding the heated side together lengthwise, and continuing to fold in this way until a roll has been made. This roll is placed along the alveolar ridge of the base plate w^here the teeth will come and is attached to the base plate by means of a hot spatula. Each wax 111. No. 1. The base plates, preferably of composition, are shaped over the models and trimmed as the plates will be. Each is stiffened with a wire to prevent, warpage when trying in. ridge should be made a little deeper vertically than is required in the finished piece. The upper w^ax ricige may be given a smooth occlusal surface by warming it slightly and laying on a sheet of baseplate w^ax which rests on a smooth surface, preferably glass. Any inequal- ities between the wax ridge and the sheet can be filled in with hot wax. The occlusal surface of the lower wax ridge need not be quite so smooth.