The Effect of One-bottle Adhesive on Microleakage of Filled and Unfilled Fissure Sealants

One of the factors leading to failure of sealant therapy is microleakage. Various materials and methods have been recommended in order to reduce this phenomenon. They include the use of sealants with high and low filler content and the use of adhesives and other conditioning systems for preparation of etched enamel surface. The aim of this experimental study was to assess the effect of one-bottle adhesive system on the marginal microleakage of the filled and unfilled fissure sealant. Forty extracted human caries-free premolars were randomly assigned into 4 groups of 10. The teeth in each group were sealed according to the following protocols: 1) etching + unfilled sealant (clinpro) 2) etching + filled sealant (Delton Fs ) 3) etching+ single Bond + unfilled sealant 4) etching +single Bond + filled sealant. The teeth were then thermocycled (500 cycles between 50C and 550C) and immersed in 1% buffered methylene blue dye for 24h. Each tooth was divided into three sections، and each section was analyzed for microleakage، using a stereomicroscope. Kruskall-Wallis test was used for comparison of microleakage among the four groups. The results showed that all the groups had some degree of microleakage and there was not any significant difference among them (p > 0. 05). The addition of filler particles to sealants and using a bonding agent system (Single Bond) had no effect on reduction of the microleakage.