[Adhesive bonding system Wiron 88--Superbond--enamel, dentin. A study based on scanning electron microscopy and...

The components of the bonding system Wiron 88--Superbond enamel, dentin were examined by scanning electron microscopy and profile scanning. Wiron 88 was corroded electrolytically using Korolyt A in the Eltrokor system. At 400 mA/cm2 and an exposure time of 7 minutes an optimal microretentive surface morphology was seen on SEM. Both shorter and longer exposure times did not produce the desired results. Profile scanning of corroded Wiron 88 to determine vertical and horizontal surface changes showed that surface roughness increased as a function of increasing exposure times. On SEM of the Superbond material placed in contact with corroded metal and enamel, retentive structures were found to spread, thus producing a micromechanical bond. Phosphoric acid treatment increased the diameter of the dentin canals so that penetration of Superbond in corroded dentin was better than in non-corroded dentin. These results and several years of clinical experiences in adhesive denture work establish the usefulness of combining electrolytically corroded Wiron 88 and Superbond.