RESUMO
The purpose of this study was to compare shear bond strength of a sealant to intact enamel when different adhesive systems were applied. Sixty eight permanent premolars were randomly divided into 4 groups of 17 specimens. The flattest buccal area of each tooth was used as a testing surface. For the control (conventional) group, testing surfaces were treated with 37% phosphoric acid. For experimental groups, flat surfaces were treated with three different adhesive materials as follow: SB (37% phosphoric and Single Bond®); CSE (acidic primer of Clearfil SE Bond®); and AdP (Adper Prompt L- Pop®). A rubber tube of 2.0 mm in diameter and 1.5 mm in height was placed on prepared enamel and filled with sealant (Concise®), then light cured for 40 seconds. All samples were tested for shear bond strength (MPa) after thermocycling for 500 cycles. The results of this study revealed that shear bond strength in the SB group was significantly higher than other groups. Statistical analysis indicated no significant difference in shear bond strength of the CSE and the AdP group when compared with the control. In conclusion, the application of Single Bond® can improve bond strength of sealant. Moreover, the self etch adhesive may be an alternative way for sealant application which will simplify sealant procedure and shorten treatment time.Keywords: pit and fissure sealants, dental adhesive, shear bond strength