BOND STRENGTH OF COMPOSITES TO HYBRID IONOMERS

Tensile bond strengths among three different hybrid ionomers and two d ifferent hybrid composites were evaluated, With one exception, bond st rength to a high-modulus composite (Z-100) was higher than that to a l ow-modulus composite (Charisma). Thermocycling lowered the bond streng th of Charisma, whereas storage for 3 months increased the bond streng th of Z-100 compared to storage for 24 hours. Etching the hybrid ionom ers with phosphoric acid had no effect on bond strength.