Primary impression for complete denture Flashcards
1
Q
List the clinical and technical stages we carry out to make a denture
A
- Primary impressions
- Cast models and create special trays (Lab)
- Secondary impression
- Cast models and create record rims (Lab)
- Jaw registration
- Mount on articulator and set up teeth (LAB)
- Try in
- process to finish
2
Q
What should a primary impression aim to record
A
The entire functional denture bearing area to ensure maximum support, retention and stability for the denture during use
3
Q
List key features seen on an upper impression
A
- Hauler notch
- Vibrating line
- Fovea patinae
- Incisive papilla
- Labia frenum
- Palatal rugae
- Labial sulcus
- Buccal frenum
- Buccal sulcus
- Mucogingival line
4
Q
List key features seen on lower impression
A
- Retromolar pad
- Lingual sulcus
- Lingual frenum
- Pear shaped pad
- Buccal sulcus
- Buccal shelf
- Labial sulcus
- Buccal frenum
- Labial frenum
5
Q
What makes a good impression
A
- Tissues recorded without distortion
- Completed with minimal discomfort to the patient
- Must be over the maximum denture bearing area
- Should be free of significant defects
6
Q
What makes a bad impression
A
- Significant voids
- Under extension
- Overextension
- Impression material not adhering to tray
- Impression that does not cover full denture bearing area
7
Q
What things can lead to bad impression
A
- Incorrect tray selection
- Stock tray being under extended so alginate impression being too high
- Impression tray not being seated centrally leading to widening and narrowing of sulcus
8
Q
What material scan we use for a primary impression
A
- Impression compound
- Alginate
- Silicone