Lab considerations and techniques in the construction of implant retained prostheses

Question 1

Steps

Answer 1

1) Model construction
2) Model verification
3) Fixed beam construction
4) Final wax try in

Question 2

1) Model construction (6)

Answer 2

Fixture head impression copings
Silicone separator applied to impression
Fixture head replicas screwed to copings
"Rubber gum" material added
Model cast in die stone
Model with healing abutments in place

Question 3

3) Fixed beam construction

Answer 3

a) Cast gold alloy beam
b) Procera Implant Beam
- tooth try in on verified model
- buccal and lingual lab-putty indexes
- gold cylinders within buccal index
- Duralay pattern onto gold cylinders
- pattern sectioned
- pattern joined together
- finished pattern waxed over duralay
- pattern weighed to calculate amount of alloy required
- pattern sprued prior to investing
- pattern in ring
- gold casting partially de-vested
- cleaned casting within indexes

Question 4

2) Model verification (1)

Answer 4

Verification jig to make sure model is same as mouth

Question 5

4) Final wax try in (4)

Answer 5

Acrylic tried in and then polished
Remove guide planes and flash
Spot grind occlusion
Ready for insertion

Question 6

Procera Implant Bridge construction (10)

Answer 6

Model verification
Tooth try-in
Index with teeth
Duralay pattern within index
Digital order form generated using Procera system
Model and pattern sent to Sweden
Model and pattern laser scanned
Beam milled from solid titanium returned
Passivity of fit
Ready for insertion

Question 7

Ball abutment retained overdenture (4)

Answer 7

Impression taken directly over ball abutment
Stainless steel ball abutment replica
Abutment replicas located in impression –> model
Retentive element on replica –> in denture

Question 8

Locator abutment retained overdenture

Answer 8

Impression copings
Aluminium locator abutment replica
Abutment replica placed in impression coping
Abutment replicas in model
Male housing with black processing insert
Blocking out below male housing
Preparing for packing
Fit surface of processed denture
Locator core tool
Removal of processing insert
Blue locator male insert selected and placed
Gold beam incorporating locators
Locator female screwed into beam