Evaluation of microtensile bond strength of different fissure sealants to bovine enamel

Background: The aim of this study was to evaluate the microtensile bond strength (mu TBS) of a new fissure sealant and compare it with conventional sealants which are applied to enamel alone, and also with self-etch and etch-and-rinse adhesives. Methods: Enamel specimens were prepared and randomly distributed into three groups according to fissure sealant (Aegis, Helioseal F, Helioseal Clear). Each group was then subdivided according to adhesive system (Clearfil S3, Single Bond, no adhesive). A universal testing machine was used to measure lTBS, and data were analysed using one- way ANOVA and Tukey's tests. Results: lTBS values for all Aegis subgroups were significantly lower than for comparable Helioseal F and Helioseal Clear subgroups (p < 0.05). No differences were observed in lTBS of Helioseal F and Helioseal Clear (p > 0.05). In the Helioseal Clear group, lTBS values for Single Bond were significantly higher than for Clearfil S3 (p < 0.05). However, no significant differences were found between the lTBS values of the adhesive subgroups in the Aegis or Helioseal F groups (p > 0.05). Conclusions: Sealant lTBS values may be affected by material content. The addition of an adhesive may improve lTBS values of sealant to enamel.