Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Diagnosis & Treatment Planning -2
3. Pterygomandibular raphe
- Behind hamular notches - significant rarely
- Have patient open wide as possible
- Can displace denture – requires relief in extreme cases
B. Tuberosity
- Displaceability
- If undercut - use elastomeric impression material – palpate for undercuts
C. Ridge form
- Advise patient if poor, since it will affect retention and stability
D. Labial/Buccal vestibule - 2-4 mm thick
- Buccal vestibule - zygomatic process - can be prominent
- When flat ridge - use care in accurately registering the vestibule to maximize
retention
E. Frena - check prominence:
- Buccal frenum - usually broader
- Thin labial frenum
F. Bony areas, tori - mid palatal suture
- Don’t want binding or fulcruming on the midline
- Fulcruming will cause discomfort, loss of retention & possible denture fracture
MANDIBULAR
Form of the mandibular arch is even more critical than in the maxilla, since there is less
surface area for retention, and the moveable structures of the tongue and floor of the
mouth can cause denture displacement if the denture is overextended- inform patients of
any potential retentive problems.
A. Retromolar pad
- Terminal border of the denture base
- Compressible soft tissue – affects comfort and denture peripheral seal
- Must be captured in impression
B. Buccal shelf
- Check width - alginate will almost always overextend - painful
- Custom tray, border molded - not felt extraorally
- External oblique ridge sometimes prominent - do not cover - painful
C. Labial/Buccal vestibule
- Easy to overextend
- Check with minimal manipulation of lips
- Masseter - affects distobuccal border
- if more prominent - concave border of denture