EFFECTS OF VARIOUS ADHESIVE SYSTEMS WITH CAVITY CLEANING TECHNIQUES ON MICROTENSILE BOND STRENGTH OF ENDODONTICALLY TREATED TEETH

This paper investigated the effect of cavity cleaning methods on the bond strength of adhesive systems to dentin after removing zinc-oxide eugenol (ZOE) temporary material. Coronal parts of 96 extracted third molar teeth were removed, and occlusal access cavities were prepared. After root canal treatment, cavities were filled with ZOE and stored in distilled water for seven days at 37 degrees C. After ZOE was removed, teeth were randomly divided into three groups according to cavity cleaning methods (control, 2% chlorhexidine, and ethanol), and five subgroups (3-step total-etch, 2-step self-etch, 1-step self-etch, universal adhesive, and chlorhexidine containing universal adhesive). After restoration with composite resin, the specimens were sectioned into 1 mm(2) surface area beams. A microtensile bond strength (mu TBS) test was performed. Failure modes were determined under a stereomicroscope and analyzed with a scanning electron microscope. The highest mu TBS was observed in chlorhexidine-containing universal adhesive after applying ethanol for 30 s. Ethanol application for 30 s created cleaner dentin surfaces and could increase the adhesive penetration by removing the ZOE residues better than the control and 2% chlorhexidine application for 30 s.