Lab considerations and techniques in the construction of implant retained prostheses

Question 1

What does the dental technician do for an implant overdenture case?

Answer 1

1. Model construction from silicone impressions
   - Fixture head impression copings
   - Silicone separator applied to impression
   - Fixture head replicas screwed to copings
   - Rubber gum material added
   - Model cast in die stone
2. Model verification to ensure it is same as what is in mouth
3. Fixed beam construction
   - Cast gold alloy beam: not used much anymore
   - Procera implant beam

Question 2

Stages of cast gold alloy beams for fixed beam construction?

Answer 2

Gold beam construction
Tooth try in on verified model 
Buccal and lingual lab putty indexes
Gold cylinders within buccal index 
Duralay pattern onto gold cylinders
Patterned sectioned and joined together 
Finished pattern waxed over duralay
Wax try in
Polish
Remove guide pins and flash 
Check occlusion against model

Question 3

Stages of procera implant bridge construction for fixed beam construction?

Answer 3

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 and laser scanned
Beam milled from solid titanium returned
Check fit on model