Complete dentures Impressions and occlusion for replica dentures

Question 1

What are the stages in conventional dentures?

Answer 1

1. Assessment of patient and dentures
2. Primary Impressions
3. Master impressions (Definitive/Secondary)
4. Registration Visit
5. Trial Insertion visits (Tooth trial)
6. Insertion (Delivery)
7. Maintenance (Review)
8. Aftercare

Question 2

What are the stages in replica construction?

Answer 2

1. Assessment of patient and dentures
2. Replica Impressions
3. 2nd imps and occlusion
4. Trial Insertion visits (Tooth trial)
5. Insertion (Delivery)
6. Maintenance (Review)
7. Aftercare

Question 3

What should you consider if there are a lot of changes to be made?

Answer 3

conventional

Question 4

What are the objectives of replica impressions?

Answer 4

• Create a replica prosthesis that is dimensionally accurate
• Replica should have a solid base for recording the working impression
• Replica should have occlusal and polished surfaces that can be easily modified

Question 5

Why should you temporarily modify the old dentures with greenstick?

Answer 5

1. Check assessment correct
2. Make later stages easier

Question 6

What are the steps of using greenstick?

Answer 6

1. Heat slowly
2. Wait until it goes matt
3. A big “dod”
4. Shape approximately
5. Mould in mouth
6. Not on fitting surface

Question 7

What is the visit order when making replica dentures in a normal situation?

Answer 7

1. Check replica blocs
2. Modify replica blocs
3. Take impressions
4. Record occlusion

Question 8

What is the visit order when making replica dentures if retention is poor?

Answer 8

1. Check replica blocs
2. Take impressions
3. Modify replica blocs
4. Record occlusion

Question 9

What is the normal freeway space?

Answer 9

*Ideally 2-4mm
*Often greater with worn teeth
*Don’t change too much from orginal denture
*Avoid -ve freeway space

Question 10

When should you not use facebow?

Answer 10

complete dentures

Question 11

How should you take working impressions?

Answer 11

• Seat the tray fully and manipulate the lips and cheeks (tongue protruded with lower)
• Use a closed mouth technique

Question 12

How should you assess the working impression?

Answer 12

• Ensure impression covers whole of denture bearing area
• Sulci - rounded free from defects
• Correctly shaped and extended
• Width - related to the width of the patients sulcus during function

Question 13

How should you take your master impression?

Answer 13

Upper: stand behind Lower: stand in front
1. Rotate the tray into patients mouth
2. Seat the tray home consider viscosity of material
3. Muscle manipulation
4. Closed mouth technique
5. Remove the impression