Reline/rebase

Question 1

What is relining?

Answer 1

Straight forward substitution of layer of impression material within denture by a layer of new acrylic resin. This increases the thickness of upper denture . Impression material will change thickness
PVS lightbody will be minimal increase
Can affect compliance/ retention

Question 2

What is rebasing?

Indication

Answer 2

Replacement of most of original acrylic base of denture. Used for UPPER denture as less likely to increase the thickness.
Deteriorated base/history of previous fracture
looseness of denture - unbalanced occlusion

Question 3

Preparatory Process

Answer 3

Occlusion must be balanced.
Over/underextension corrected
Undercuts within impression surface eliminated
WARN PATIENT THAT THEY’LL HAVE TO BE WITHOUT DENTURE - Immediate denture

Question 4

Long term soft lining materials and purpose

Answer 4

Distribute load more evenly and absorb impact - cushioning.
Improves masticatory performance and better comfort than hard relines.
Dimensionably stable/improved accuracy and fit
Materials - heat curing silicone

Question 5

Indication for soft lining

Answer 5

Atrophic mucosa
Pain under denture
parafumction

Question 6

What is the aetiology of a flabby ridge

Answer 6

Flabby ridge causeby by combination syndrome - max complete denture, lower natural teeth

Question 7

Treatment approaches for a flabby ridge

Answer 7

Surgical:
-Excision of fibrous tissue - Osseointegrated implants
Contraind - older patients with complex MH/probably too little bone for implants/removal of fibrous tissue will reduce extent and volume of denture bearing area

NS:

• Mucodisplacive impression technique - compress flabby tissue to obtain max support
• Mucostatic imoression technique for max retention (BEST OPTION)Mos

Question 8

Detailed explaination of impression technique for a flabby ridge

Answer 8

-Primary imps - stock tray and low visc alginate (reduced tissue displacement) - mark flabby ridge on preliminary cast
-Special tray - area of flabby risge left uncovered. - low viscocity silicone, alginate, compound used for normal mucosa.
Reduce pressure by cutting perforations in tray at flabby tissue.
Impression of flabby ridge taken by imp compound