Abstract
A modified 50 per cent phosphoric acid solution was used to condition occlusal surfaces prior to the application of adhesive sealants. The extent to which this agent affects the occlusal sites of permanent molar and premolar teeth was investigated using scanning electron microscopy. The effect of the conditioning solution was almost exclusively confined to the cuspal inclined planes where it promoted an increase in the enamel porosity. Its ineffectiveness below the fissural constriction was believed related to the deposits located in the bases of the fissures. These deposits contained spheroidal and rod-shaped bodies resembling micro-organisms.
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