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Introduction to: cavity varnish, liners and bases

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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Introduction to: cavity varnish, liners and bases

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  1. Introduction to: cavity varnish, liners and bases DA 122 Dental Materials

  2. Uses • Varnish, liners and bases are used for: • Prevention of irritation from metal restorations • Sedating an irritated pulp • Providing thermal insulation

  3. 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

  4. Treatment of Cavity Preparations • Ideal • Minimal dentin and enamel removed • Beyond ideal • Dentin restored with base

  5. 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

  6. 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

  7. Treatment of Cavity Preparations • Ideal • Minimal dentin and enamel removed • Beyond ideal • Dentin restored with base

  8. 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

  9. 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

  10. base • Applied in thick layer (like putty) between tooth and restoration • Protects pulp from: • Chemical irritation • Temperature changes • Electrical protection • Mechanical injury

  11. Cements used as bases • Zinc phosphate • Insulating base • Zinc oxide and eugenol (ZOE) • Low strength base • Polycarboxylate • High strength base

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