METHODS	All teeth were stored in distilled water at 37 degrees C for 24 h , thermocycled ( 500x , 5 degrees to 55 degrees C , 30 s dwell ) and then placed in a 0.5 % methylene blue dye solution for 24 h at 37 degrees C. Samples were sectioned longitudinally and evaluated for microleakage at the gingival margin under a stereomicroscope at 20x magnification .\