Furca is the region of division of the tooth root. It is a bifurcation if there are two roots or a trifurcation if there are three roots. Since times immemorial a wealth of information has been gathered that has allowed clinicians to dramatically modify the evaluation and treatment of a tooth with periodontal destruction in the furcation region. Elimination of pockets and establishment of a functional topography permitting optimal plaque control often requires elaborate surgical techniques, because the destruction in this area proceeds not only in an apical direction along the root surfaces,...