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Measurement and calculation of the filling ratios by dividing the red marked measure through the respective blue one. The three-dimensional rendered and segmented CT data on the left side allowed for volumetric calculation of the canal fill ratio (3D VFR). Calculation of the canal fill ratios based on two-dimensional plane radiographs (2D Metaphysis FR and 2D Diaphysis FR) is shown on the right side based on current clinical practice [14,16].
