Shear strength after ethylene diaminetetraacetic acid conditioning of dentin

Can the basis of previous studio,, it was hypothesized that a eh elating agent such as ethylenediamine- tetraacetic acid (EDTA) in a saturated aqueous solution (24%) can Function as a dentin conditioning went with exposure times comparable to that of phosphoric acid Without compromising shear bond strength. Thirty caries-Free human third molars, divided equally between two groups, were used. In group one, four experimental surfaces were prepared on cacti tooth, and cylindrical copper matrixes with a diameter OF 5 mm were attached to the prepared surfaces. The experimental surfaces were then treated with a 24% EDTA,gel for 30, 60, 120, or 240 see, respectively. Dentin was bonded with All Bond 2, after which a flowable composite was added and light-cured. In group two, which served,as control, two surfaces were prepared on each tooth. One surface was left unetched, whereas die other side was treated with 21% EDTA-gel for 30 sec. A shear bond strength test was performed at a crosshead speed of 1 mm/min until the composite debonded. There was no statistically significant difference (P < 0.89) between results of the shear bond strength test For the different EDTA conditioning times. The cons of group showed a significant deference in shear bond strength between untreated surfaces and surfaces conditioned for 30 see with EDTA. Thus, the results indicate that the duration of EDTA gel conditioning of dentin surfaces need not exceed that of phosphoric acid in clinical practice to obtain an acceptable level of bond strength.