[Hemisection, tooth separation and root amputation].

It is possible to utilize a segment of multirooted tooth as a healthy abutment even though retention of the entire tooth is impossible due to advanced periodontal disease, carious lesion or endocontic failure. The criteria for success of tooth hemisection, root separation or root amputation is dependent on the following factors: -proper case selection based upon adequate diagnostic tests -periodontal condition (amount of supporting bone) surrounding the remaining segment -condition of the remaining dentition -the ability to establish optimal occlusal relationship with minimal traumatic forces -the ability to perform satisfactory endodontic procedures, using an aseptic technique -stabilization by means of fixed prosthesis -the ability to establish an environment amenable to optimal oral hygiene.