RESUMEN
This in-vitro study aimed to evaluate and compare the marginal leakage and penetration ability of a moisture-tolerant (Embrace WetBondTM) and a conventional (ClinproTM) resin-based sealants under three different enamel surface preparations (acid etched, acid etched and saliva contaminated and bur preparation and acid etched). One hundred and twenty extracted caries free human premolars teeth were cleaned and randomly divided into six groups of equal numbers, according to the type of sealants used and surface preparations. All the sealed teeth were subjected to thermocycling and immersed in a methylene blue dye. Each tooth was then embedded into acrylic resin before it was sectioned into four sections per tooth. Marginal leakage and unfilled surface area (indicating penetration depth of resin) were then measured using an optical 3D measurement device (Alicona Infinite Focus®). Both sealants exhibited comparable proportion of marginal leakage on acid etched only surfaces. Moisture-tolerant sealant showed the least proportion of marginal leakage on bur prepared and etched surfaces. Presence of saliva has detrimental effect on adhesion of both sealants. Nevertheless, depth of penetration of sealant into the fissures is comparable with both sealant types irrespective of the surface preparations.