1988 Volume 7 Issue 6 Pages 952-959
The effects of pretreatment of tooth substrate for strong adhesion of resins to tooth were examined.To determine the pretreatment reagent that causes minimum damage and promotes good adhesion on tooth, diethylene triamine pentaacetic acid(DTPA)which has a chelation capacity similar to EDTA was examined.After application of 0.2M DTPA・Fe・Na-0.3M DTPA・2Na(Na salt)or 0.2M DTPA・Fe・NH4-0.3M DTPA・2NH4(NH4 salt)at pH7.4, on the tooth surface, the amount of leached Ca2+ and the dependence of treatment time on tensile bond strength were investigated.The pretreated surfaces were also observed with SEM and TEM.Although there was no correlation between the amount of leached Ca2+ and the tensile bond strength, the application of these reagents had different effects on the adhesion of resin to tooth substrate.The pretreatment with either Na salt or NH4 salt is effective for increasing bond strength of 4-META/MMA-TBB resin to dentin as well as enamel, but the bond stability on enamel is improved by the NH4 salt.
