Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Wax Try-in - 61
If the vertical dimension is too great, assess whether one or both arches will require
reduction in height. Changes can be done in the laboratory, since a change will
necessitate the resetting of all the teeth in at least one of the arches. Remember, that the
height of both the anterior and posterior teeth must be changed. If only the posterior
teeth are changed, there will be an undesired effect on overbite relationships, esthetics,
and balancing contacts. Assess how these changes will affect the overall appearance of
the patient, before sending the dentures to the laboratory.
2. Centric Position Contacts
Mark the centric contacts with articulating paper while stabilizing the mandibular denture
and placing patient into centric relation (you will need an assistant to hold the articulating
paper). Place a thin line of polyvinyl siloxane bite registration material over the occlusal
table and make a new centric relation record. Using a small amount of registration
material will improve the accuracy of the record by providing less resistance during
patient closure. The opposing cusps should not penetrate the registration, but you may be
able to see the articulator markings through the thin areas of the material. This is a
preliminary means of confirming the record was acceptable.
To confirm the accuracy of the articulator mounting, loosen the centric locking
mechanism of the articulator, so the condylar elements are free to translate. Seat both
record bases and interdigitate the teeth into the centric record. If the mounting is
accurate, the condylar elements should be firmly seated in the hinge position (no
space between the condylar ball and the wall of the fossae) and the teeth should
perfectly interdigitate with the recording medium (no space around the cusps). If
either of these criteria are not met, the record should be remade. If a second record
shows the mounting to be inaccurate, the mandibular cast should be removed from the
mounting ring, half of the mounting plaster ground from inferior aspect and the cast
should be remounted, using the new record.