Hamular Notch / Pterygomaxillary notch- Depression distal to the maxillary tuberosity- Used as a landmark for posterior extension of the maxillary dentureRECORDS ON THE IMPRESSION – Anatomical Structures1. Ant. vibrating line2. Post. Vibrating line important3. Hamular notch4. Fovea palatine --------- least importantNB : PPS is marked on cast using – Lecron’s carver*PARTS OF PPS:- PPS area- Pterygomaxillary areaAnt. Vibrating Line Post. Vibrating LineBORDERS OF PPS:- Ant vibrating line- Post vibrating line- Hamular notch- Fovea palatineFUNCTION OF PPS:- Improves retention- Completes the border seal of the maxillary denture- Compensation of polymerization shrinkage- Prevent food lodgementNB : If food lodgement is not prevented – causes gag reflex – glossopharyngeal nerve involved here

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