The role of the operating microscope
Fig. 1a: Debris left after root treatment of distal canal of a lower molar.
Fig. 1b: Radiograph of failed root canal treatment shown in Fig.1a.
Fig. 2: Oval shaped canal in the apical third of the distal root of a lower molar.
Fig. 3: Debris accumulated after preparation in the isthmus between the mesial canals of a lower molar.
Fig. 4: Acoustic microstreaming patterns produced by an ultrasonically energized K-file.
Fig. 5: Inspection of a prepared oval shaped distal canal of a lower molar reveals residual debris apically.
Fig. 6: Ultrasonically energised K-file used to prepare an isthmus under the operating microscope.
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