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The most upper area of the Bone Crest determined as BC) point. The point that created from a line that was drawn perpendicular to the root from BC point determined as Tooth Crest or (TC) point. The point that created from a line that was drawn from the BC point to the most extreme area of the Bone Defect determined as BD point. The measurement from the lowest regions of the root to the lowest regions of cementoenamel junctionCEJ of tooth determined as root length
