Date post: | 16-Apr-2015 |
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Post-dam in complete dentures Dr Sara Jaser
MDSc in Prosthodontics - UK
MFDS RCSEd - UK
BDS - Jordan
No posterior…..!!
Posterior palatal seal area
• The soft tissues at or beyond the junction of the hard and soft palates on which pressure, within the physiologic limits of the tissues, can be applied by a denture.
Post dam
• The elevated lip of acrylic in the denture contacting the posterior palatal seal area.
Aims
• Complete the peripheral seal
consequently achieving…
• Retention
• Stability
Advantages
1. Reduces:
-Gag reflex
-Tongue discomfort
-Food accumulation
2. Compensate for volumetric shrinkage
3. Partial vacuum effect
Anatomical Landmarks
• Pterygomaxillary notch
• Pterygoid process
• Maxillary tuberosity
• Fovea palatini
• Median palatal raphe
• Pterygomandibular raphe
• Posterior nasal spine
• Torus palatinus
All but….!!
• Pterygomaxillary seal
• Postpalatal seal
• AVL
• PVL
• Posterior palatal seal area
House Classification
• Class I Class II Class III
Postdamming - Outlines
• Major-Minor
• Cupid-bow
• Single line
Class ??
Class ??
Depth and Width
Postdamming - Stages
• Master Impression
• Jaw registration
• Try-in
• Post insertion
Techniques
• Anatomical
• Functional – fluid wax technique
• Arbitrary (dentist/technician)
Techniques - anatomical
Potential Over-compression
Techniques - functional
Fluid wax technique
Advantages Disadvantages
• Physiologic technique
• Over-compression is avoided
• Mechanical scraping of the cast is avoided
• Posterior palatal seal is added to the trial base
• Time!
• Difficulty handling the material
Troubleshooting
• Underextension
• Overextension
Troubleshooting
• Shallow
• Deep
It is your job and only yours!!