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Cavity lining dental solutions designed for use as a very thin protective coating over the surfaces of a dental cavity before placement of restorative materials. These dental materials consist of clear solutions of a resinous material or natural gum in a suitable organic solvent (e.g., ether or chloroform), that quickly evaporate and leave the resin as a very thin film over the preparation. Cavity varnish is not intended for use with composite resins since the varnish retards their set and interferes with their bonding. They are used in dentists\' offices during operative dental procedures primarily to seal the dentinal tubules and to help prevent seepage of fluids, microorganisms, and/or debris between a restoration and the cavity walls (i.e., microleakage).
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