Page 7 - Directions for the manipulation of the Gysi adaptable articulator

DIRECTIONS FOR MANIPULATING THE GYSI ADAPTABLE ARTICULATOR Professor Alfred Gysi, D. D. S., Zurich, Switzerland These directions suppose that satisfactory impressions have been taken and good models poured. It will be advantageous to carve the rugae deeper in the upper impression. This will empha- size them in the model and will relieve them of pressure in the mouth. Shaping The Base Plates The base plate should be made of some stiff material, prefer- ably a good base plate composition, which can be easily shaped while warm but which retains its form when cold. It should be trimmed to the area to be occupied by the denture. At the posterior margin, the upper trial plate should extend about im.m. posteriorly of the hard palate. This carries it slightly onto the tissues of the soft palate and permits these tissues to form a valve with the margin of the plate. It will be found advantageous to embed a wire, prefer- ably about the size of an ordinary pencil lead In the upper trial plate, as shown in illustration No. i. This prevents warping under the pressure to which It will be subjected. Great care should be taken to adapt the base plate well to the model, especially about the emphasized rugae. If this Is not done, the trial plate may be supported in the mouth by the rugae, which are soft and yielding. The bite will then be taken with the trial