Hamular Notch / Pterygomaxillary notch
- Depression distal to the maxillary tuberosity
- Used as a landmark for posterior extension of the maxillary denture

RECORDS ON THE IMPRESSION – Anatomical Structures
1. Ant. vibrating line
2. Post. Vibrating line important
3. Hamular notch
4. Fovea palatine --------- least important
NB : PPS is marked on cast using – Lecron’s carver*

PARTS OF PPS:
- PPS area
- Pterygomaxillary area

Ant. Vibrating Line Post. Vibrating Line

BORDERS OF PPS:
- Ant vibrating line
- Post vibrating line
- Hamular notch
- Fovea palatine

FUNCTION OF PPS:
- Improves retention
- Completes the border seal of the maxillary denture
- Compensation of polymerization shrinkage
- Prevent food lodgement

NB : If food lodgement is not prevented – causes gag reflex – glossopharyngeal nerve involved here