Dr. Aamir Mehmood Butt,

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Denture Relining Rebasing

• By
• Dr. Aamir Mehmood Butt,
• Assistant Professor
• Deptt Of Prosthodontics
• LUMHS, Jamshoro

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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)

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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

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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.

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Relining Materials

• According to time
• Shortterm 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

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Relining Materials

• According to type of Activation
• Heat activation
• Chemical activation

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Uses of short-term liners

1. Treatment conditioning of abused oral
   supporting tissues.
2. Diagnostic purposes such as recovery of VD.
3. Temporary relining of immediate denture/ surgical
   splints/ cleft palate speech aids etc.
4. Tissue conditioning during implant healing.
5. Functional impression material.

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Qualities of an ideal long-term reliner

1. Biocompatibility
2. Dimensional stability
3. Low water sorption solubility
4. Low surface tension
5. Permanent softness
6. Abrasion resistance
7. Good bond to denture base material
8. Simple to manipulate
9. Color stability
10. Resist microorganisms growth

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Comparison of plasticized acrylic versus silicon
rubber

• PLASTICIZED ACRYLIC
• Less resilient
• Hardens by time
• Good bonding with base material
• Acceptable tear resistance
• Better abrasion resistance
• Resistance to damage by denture cleansers

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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

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REBASING

• DEFINITION
• The laboratory
  procedure of replacing the entire denture base
  material on an existing prosthesis
• (GPT 2005)

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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.