1. Denture Relining & Rebasing Deptt: Of ProsthodonticsBy
Dr. Aamir Mehmood Butt,
Assistant Professor
Deptt: Of Prosthodontics
LUMHS, Jamshoro

2. Denture Relining Definition:
“ procedure used to resurface the tissue side of a denture with new base material, producing an accurate adaptation to the denture foundation area”
( GPT 2005)

3. Indications 1. Resorption of the bone could leads to:
Loss of retention & stability
Loss of VD
Loss of support of facial tissues
Incorrect occlusal relationship
Immediate denture after 3 -to - 6 months of construction.
Economics
Geriatric or chronically ill pt:
Time problem
Loose denture at the time of delivery

4. Contra- Indications Poor quality of denture base
Exaggerated bone resorption
Abused or traumatic oral tissues
Poor teeth arrangement
Unsatisfactory jaw relationship
Speech problem
Undercuts
TMJ problems.

5. Relining Materials According to time:
Short–term liners
example: tissue conditioners, preformed sheets of acrylic gel.
b long-term liners
plasticized acrylic( heat & chemical activated forms are available)
Heat activated silicones
RTV ( room temperature vulcanization ) silicones
Plasticized vinyl polymers & copolymers
Hydrophilic polymers
Polyphosphazine fluoropolymers
Fluoroethylene
PVS

6. Relining Materials According to type of Activation Heat activation
Chemical activation

7. Uses of short-term liners
Treatment & conditioning of abused oral & supporting tissues.
Diagnostic purposes such as recovery of VD.
Temporary relining of immediate denture/ surgical splints/ cleft palate speech aids etc.
Tissue conditioning during implant healing.
Functional impression material.

8. Qualities of an ideal long-term reliner
Biocompatibility
Dimensional stability
Low water sorption & solubility
Low surface tension
Permanent softness
Abrasion resistance
Good bond to denture base material
Simple to manipulate
Color stability
Resist microorganisms growth

9. Comparison of plasticized acrylic versus silicon rubber
Less resilient
Hardens by time
Good bonding with base material
Acceptable tear resistance
Better abrasion resistance
Resistance to damage by denture cleansers

10. Comparison of plasticized acrylic versus silicon rubber
SILICONE RUBBER:
Highly resilient
Poor bonding to acrylic denture base
More water sorption
More susceptibility to microorganism growth
Low tear & abrasive resistance
Less resistance to damage by denture cleansers

11. REBASING
DEFINITION:
“ The laboratory procedure of replacing the entire denture base material on an existing prosthesis”
(GPT 2005)

12. Indications Where the observed clinical changes are moderate to sever.
Some processing fault in denture base e.g: porosity
Discoloration of base material.
Where porcelain teeth have been used.