Page 12 - Directions for the manipulation of the Gysi adaptable articulator

111. No. 5. Soften the wax ridg^e by thrusting the warm spatula into the surface of the ridge without touching the lingual or buccal margin. This heats the wax deeply enough to keep it soft until the trial plate can be put into the mouth and manipulated. The lower trial plate is put into the mouth while the ridge is still soft and the patient is directed to close the jaws together so that the upper wax ridge may press the lower into shape. The forma- tions of the wax ridge and the manner of closure demand further attention. Proper results in the manipulation of the trial plates can be secured only if the wax ridges of both trial plates are so shaped that they meet properly all the way around from heel to heel. They may be partly shaped to this end on the base plates by trying one above the other with the median lines of the models in proper relations. When the upper has been trimmed, the lower may be tried into the mouth before it is softened to see if one ridge is just above the other. The patient should not be allowed to make any pressure of one trial plate on the other until the ridges are so shaped as to take the full pressure on both sides. Many a denture