Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Preliminary Edemtulous Impressions - 8
Patient preparation
1. Practice placing and removing the tray so dentist and patient are better prepared
2. Dry the mucosa with gauze – don’t let patient close until the impression is made.
Otherwise, dry the tissues again.
3. Mark the vibrating line prior to making preliminary and final impressions. The fovea
should not be used for arbitrarily determining the posterior border. The technique
for determining the correct posterior border is outlined below:
a. Locate and mark the hamular” notch with indelible stick
1. The posterior border of a complete denture and some partial dentures must pass
through this notch, between the bony tuberosity and hamulus. Denture border
must terminate on “soft displaceable tissue”, to provide comfort and retention. In
some patients the notch is posterior to where the depression in the soft tissue
appears.
2. Use the head of a mirror, to palpate the notch and mark it with an indelible
marker.
b. Locate the posterior border of hard palate
Ensure the denture terminates posterior to this landmark by palpating the end of the
hard palate.
c. Locate and mark the vibrating line
The denture should terminate here in the midline at the junction of movable and
immovable portions of the soft palate. If the denture terminates posterior to this,
movements of the soft palate may cause it to dislodge. If the denture terminates
anterior to this, on the hard palate, no seal or a poor seal may be created, and the
denture may be unretentive and/or uncomfortable.
d. Make the impression after the vibrating line & hamular notches are marked