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

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Presentation on theme: "1 Introduction to: cavity varnish, liners and bases DA 122 Dental Materials DA 122 Dental Materials."— Presentation transcript:

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

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

3 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 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 4 Treatment of Cavity Preparations Ideal –Minimal dentin and enamel removed Beyond ideal –Dentin restored with base Ideal –Minimal dentin and enamel removed Beyond ideal –Dentin restored with base 4

5 5 Treatment of Cavity Preparations Near-exposure –Restoration occurs close to pulp Exposed pulp –Can vitality of tooth be saved Near-exposure –Restoration occurs close to pulp Exposed pulp –Can vitality of tooth be saved 5

6 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 Treatment of cavity preparations –Varies with amount of enamel and dentin removed and how near the prep is to the pulp 6

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

8 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 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 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 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 10 base Applied in thick layer (like putty) between tooth and restoration –Protects pulp from: Chemical irritation Temperature changes Electrical protection Mechanical injury Applied in thick layer (like putty) between tooth and restoration –Protects pulp from: Chemical irritation Temperature changes Electrical protection Mechanical injury

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


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