Cavity liners

Cavity liners

1. Requirements

   • Thermal protection
   • Chemical protection
   • Electrical protection
     • Galvanic pain (amalgam)
   • Insoluble
   • No interference with filling setting reaction
   • Radiopaque

2. Calcium hydroxide

   • Composition
     • 2 pastes - base & catalyst
   • Setting reaction = Chelation
   • Advantages
     • Alkaline
       • Anti-microbial
       • Encourages tertiary dentine deposition
     • Compatible with composite
   • Disadvantages
     • Very soluble
     • Weak
   • Types
     • Setting
       • Cavity liner
       • Direct pulp cap
       • Indirect pulp cap
         • Stepwise excavation
     • Non-setting
       • Root canal temporisation

3. ZOE

   • Composition
     • Zinc oxide
     • Eugenol
   • Setting reaction = Acid base
   • Advantage
     • Thermal, chemical & electrical insulator
     • Anti-microbial
   • Disadvantages
     • Very soluble
     • Weak & brittle
     • Not compatible with composite
   • Uses
     • Liner in Primary E Pulpotomy
       • Restored with PFMC or GIC + composite
     • Temporarising access cavity
       • Short-term, non-load bearing
         • Sedanol
           • Accelerated
         • Cavit
         • Kalzinol
           • Resin-modified
       • Longer-term, load bearing
         • IRM
           • Reinforced with polystyrene

4. GIC

   • Advantages
     • Least soluble
     • Strongest
     • Compatible with composite
   • Use
     • Layer on top of sublining
       • CaOH
         • Due to solubility & poor strength
       • ZOE
         • To prevent interference when restoring with composite
     • Indirect pulp cap in Primary teeth

5. EBA