introduction to cavity varnish liners and bases n.
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Introduction to: cavity varnish, liners and bases. DA 122 Dental Materials. Uses. Varnish, liners and bases are used for: Prevention of irritation from metal restorations Sedating an irritated pulp Providing thermal insulation. Determining use.

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Presentation Transcript
slide2
Uses
  • Varnish, liners and bases are used for:
    • Prevention of irritation from metal restorations
    • Sedating an irritated pulp
    • Providing thermal insulation
determining use
Determining use
  • Use of varnish, liners and bases depend on the following factors:
    • 1. Depth of the tooth prep
      • Shallow prep-goes into enamel only
        • Cavity varnish only
      • Medium prep-goes into dentin but not near pulp
        • Cavity varnish and liner
      • Deep prep-goes into dentin near the pulp
        • Cavity liner, base and varnish
    • 2. Type of restorative material used
        • Varnish not used under composite resins
treatment of cavity preparations
Treatment of Cavity Preparations
  • Ideal
    • Minimal dentin and enamel removed
  • Beyond ideal
    • Dentin restored with base
treatment of cavity preparations1
Treatment of Cavity Preparations
  • Near-exposure
    • Restoration occurs close to pulp
  • Exposed pulp
    • Can vitality of tooth be saved
  • See page 793 in Dental Assisting book for illustrations
placing cements bases and liners
Placing Cements, Bases, and Liners
  • Treatment of cavity preparations
    • Varies with amount of enamel and dentin removed and how near the prep is to the pulp
treatment of cavity preparations2
Treatment of Cavity Preparations
  • Ideal
    • Minimal dentin and enamel removed
  • Beyond ideal
    • Dentin restored with base
varnish
varnish
  • Copal cavity varnishes. Brand name: Copalite
    • No mixing
    • Applied to walls and floor of cavity prep
      • Applied with cotton pellet held in cotton pliers
      • Applied to shallow prep
liner
Liner
  • Calcium hydroxide; brand name: Dycal
    • Mix equal parts of catalyst and base
      • Mix for 10 seconds with ball-tip applicator
      • Mixture should be thin and creamy
      • Pass to dentist to apply to tooth
      • Sets in 1-2 minutes
slide10
base
  • Applied in thick layer (like putty) between tooth and restoration
    • Protects pulp from:
      • Chemical irritation
      • Temperature changes
      • Electrical protection
      • Mechanical injury
cements used as bases
Cements used as bases
  • Zinc phosphate
    • Insulating base
  • Zinc oxide and eugenol (ZOE)
    • Low strength base
  • Polycarboxylate
    • High strength base