BOND STRENGTH OF BIS-GMA AND GLASS-IONOMER PIT AND FISSURE SEALANTS USING CYCLIC FATIGUE

The aim of the study was to determine the bond strength of glass ionom er and resin-modified glass ionomer sealants compared to Bis-GMA seala nts using both static and cyclic fatigue shear testing. Four materials were evaluated: D, a Bis-GMA sealant with 10% phosphoric acid etchant ; FC, a resin-modified glass ionomer sealant with 20% polyacrylic acid etchant; FD, a resin-modified glass ionomer sealant with 10% polyacry lic acid etchant; and FSC, a self-cured glass ionomer sealant with no etchant. Gelatin capsules filled with the sealant material were bonded to the enamel surfaces of bovine teeth after appropriate surface cond itioning and then tested in shear static and cyclic fatigue. Static an d cyclic shear bond strengths, respectively, for each group were (MPa) : FC: 21.1+/-2.8 and 17.1+/-3.1; FD: 14.6+/-5.9 and 8.5+/-3.1; D: 10.8 +/-4.9 and 4.7+/-2.6; FSC: 8.7 (1.0 and 2.9+/-0.6. The resin-modified glass ionomer sealants had better fatigue bond strength than both Bis- GMA and self-cured glass ionomer sealants with the surface conditionin g affecting the bond strength of the resin-modified glass ionomer seal ants.