3 - Replica dentures

Question 1

What are the stages of replica denture construction?

Answer 1

1. Assessment of patient and dentures, replica impressions
2. Master impressions and record occlusion
3. Tooth trial
4. Delivery
5. Review

Question 2

What are the advantages of replica dentures?

Answer 2

• choose which parts of original denture you want to keep
• less appointments
• 1 impression in mouth

Question 3

Which arch are replica dentures more predictable?

Answer 3

Upper

Question 4

What is used to take replica impressions?

Answer 4

• lab putty
• vaseline
• 2x dentate upper trays

Question 5

Describe how to take replica primary impressions.

Answer 5

• apply adhesive to try
• fill upper dentate tray with lab putty
• push denture into putty, ensuring material reaches the edge of the flange but doesn’t cover the fitting surface
• cut orientating notches into putty
• cover putty in vaseline
• roll lab putty over top of denture ensuring full denture is covered
• place upper dentate tray on putty to stabilse impression

Question 6

How do you remove a denture from a replica impression?

Answer 6

• gently lever denture at the posterior ridges
• DO NOT lever at the hard palate as this can fracture

Question 7

What are the advantages of temporarily modifying dentures before replica impression?

Answer 7

• incorporates modifications in record block
• allows patient to try the change
• check assessment is correct
• make later stages easier

Question 8

How do you use green stick?

Answer 8

• heat slowly
• wait until material goes matt
• apply
• shape
• mould in mouth
• should not be applied to fitting surface

Question 9

What equipment is required to trim and record a wax block?

Answer 9

• heat source
• fox bite plate
• wax knife

Question 10

What are the aims of the 2nd visit?

Answer 10

• determine tooth position
• mater impressions
• record occlusion
• select teeth mould and shade

Question 11

What order is the 2nd visit conducted in?

Answer 11

1. check replica blocks
2. modify replica blocks
3. take impressions
4. record occlusion

Question 12

What order is the 2nd visit conducted in when the retention is poor?

Answer 12

1. check replica blocks
2. take impressions
3. modify replica blocks
4. record occlusion

Question 13

Describe FWS in complete dentures.

Answer 13

• ideally 2-4mm
• don’t change more than a couple mm from what the patient already has
• avoid negative FWS (patient can’t open)

Question 13

What material should be used for replica master impressions?

Answer 13

Light bodied silicone (thin layer)

Question 14

How do you take replica master impressions?

Answer 14

• patient upright
• rotate impression into mouth
• seat tray
• muscle manipulation
• closed mouth technique
• remove impression

Question 15

What should you assess on your master impression?

Answer 15

• denture bearing area covered?
• functional sulcus?
• good surface detail?

Question 16

Where should bite recording paste be placed on replace blocks?

Answer 16

Posterior teeth only