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Permeability test setup and method. 1: tooth sectioning. 2: samples collection and cementum removal. 3: immersion in 1% citric acid for 5 min. 4: marking of the lasing area and nail varnish coating. 5: mounting in acrylic resin mold. 6: lasing, 7: immersion in 2% methylene blue for 1 hr. 8: longitudinal sectioning. 9: stereomicroscopic examination.
