Inflammatory periodontal disease, if unabated, ultimately progresses to attachment loss sufficient to affect the bifurcation or trifurcation of multirooted teeth. In multi-rooted teeth, the bone destruction can reach the area of root separation, thus exposing it to microbial colonization. In this occurrence, a "furcation involvement" is created. This article reviews several classifications that have been proposed in an attempt to describe the anatomy of the furcation involvement which could be

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... mportant for prognosis and diagnosis of the involved teeth and for the treatment planning. Keywords: Classification of furcation involvement, Inflammatory periodontal disease, Periodontitis