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J Periodontol. 1984 May;55(5):283-4.

Classification of the vertical component of furcation involvement.


The current classifications of teeth with furcation involvements refer mainly to the horizontal component of bone loss. This article presents a subclassification that measures the probeable vertical depth from the roof of the furca apically. The subclasses being proposed are: A, B and C. "A" indicates a probeable vertical depth of 1-3 mm, "B" 4-6 mm and "C" 7 or more mm of probeable depth from the roof of the furca apically. Furcations would thus be classified as IA, IB, IC, IIA, IIB, IIC and IIIA, IIIB, IIIC.

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