Primary impression for complete denture

Question 1

List the clinical and technical stages we carry out to make a denture

Answer 1

1. Primary impressions
2. Cast models and create special trays (Lab)
3. Secondary impression
4. Cast models and create record rims (Lab)
5. Jaw registration
6. Mount on articulator and set up teeth (LAB)
7. Try in
8. process to finish

Question 2

What should a primary impression aim to record

Answer 2

The entire functional denture bearing area to ensure maximum support, retention and stability for the denture during use

Question 3

List key features seen on an upper impression

Answer 3

1. Hauler notch
2. Vibrating line
3. Fovea patinae
4. Incisive papilla
5. Labia frenum
6. Palatal rugae
7. Labial sulcus
8. Buccal frenum
9. Buccal sulcus
10. Mucogingival line

Question 4

List key features seen on lower impression

Answer 4

1. Retromolar pad
2. Lingual sulcus
3. Lingual frenum
4. Pear shaped pad
5. Buccal sulcus
6. Buccal shelf
7. Labial sulcus
8. Buccal frenum
9. Labial frenum

Question 5

What makes a good impression

Answer 5

1. Tissues recorded without distortion
2. Completed with minimal discomfort to the patient
3. Must be over the maximum denture bearing area
4. Should be free of significant defects

Question 6

What makes a bad impression

Answer 6

1. Significant voids
2. Under extension
3. Overextension
4. Impression material not adhering to tray
5. Impression that does not cover full denture bearing area

Question 7

What things can lead to bad impression

Answer 7

1. Incorrect tray selection
2. Stock tray being under extended so alginate impression being too high
3. Impression tray not being seated centrally leading to widening and narrowing of sulcus

Question 8

What material scan we use for a primary impression

Answer 8

1. Impression compound
2. Alginate
3. Silicone