Reline And Rebase

Question 1

What is rebase?

Answer 1

The laboratory construction of new denture base following clinical impressions of denture fit surface.

Question 2

Indications for rebase?

Answer 2

Residual ridge has resorbed
Immediate denture 3-6 months after insertion
Construction of new denture would cause mental or physical stress

Question 3

General considerations for rebase

Answer 3

Patient wishes / informed consent 
Extension adequate 
Aesthetics satisfactory 
Occlusion adequate
Oral tissues healthy
OVD satisfactory 
Speech satisfactory

Question 4

Rebase procedure

Answer 4

Check extension and correct with border moulding or reduce
Adjust to even occlusal contact
Remove undercut areas from denture
Place a relief holes in anterior palate
Load denture base with ZOE or PVS impression material
Closed mouth impression technique
Pour models in stone
Plaster index key to ensure correct tooth position, occlusal relationship
Base of denture removed
Rewax to new extension
Process and finish

Question 5

What is reline?

Answer 5

Addition of material to denture fit surface (permanent temporary or semi permanent) temporarily to improve fit. Done at chairside

Question 6

Reline indications

Answer 6

Aid to diagnosis
Improve fit
Treat pathology
Temporary solution only

Question 7

What are hard reline materials?

Answer 7

MMA no good as monomer is too exothermic and irritant
Total Hard Colacryl
Don’t use on upper as makes palate too thick - use on lower but OVD will still be increased

Question 8

What are resilient liners?

Answer 8

Soft reline material that absorbs occlusal load and reduces pressure on tissues
Permanent: molloplast B - heat cured silicone
Temporary: total soft (acrylic) Mollosil (silicone)

Question 9

What are tissue conditioners?

Answer 9

Soft reline material applied temporarily to denture to allow more even distribution of force and improve fit. As unhealthy tissues recover, this material adapts to maintain fit. Must change weekly.
Acrylic fit, Coe comfort, Visco comfort, FITT