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The apparatus used to evaluate coronal leakage (a). By using a shear, a hole was made at the center of the rubber stopper (b), through which the tooth was inserted (c). A cylinder prepared from a 10 mL plastic syringe was adapted to the outer surface of the stopper to create a chamber around the crown of the tooth (d). The glass flask filled with BHI broth was connected to the syringe/stopper/tooth set (e). Turbidity in the BHI broth was evaluated (f)
