Inconsistent bony margins Inconsistent bony margins Inconsistent bony margin is result of an uneven resorption of the alveolar cortical plate on lingual or facial surfaces. This finding is typical of established periodontitis where marginal bone is thin, and may be incompletely removed by the inflammatory process. The radiographic appearance of inconsistent margins are not easy to identify at times. The lesions may be superimposed on the root of the effected tooth. Stage 4 periodontal disease is represented by deep pockets, tooth mobility, gingival bleeding, and pustular discharge.
Bone loss is extensive.
Furcation exposure comes from bone loss at the furcation of multirooted teeth. Furcation exposure may occur before advanced periodontal disease. It is sometimes difficult to determine radiographically, whether the interradicular space is involved, unless there is a radiolucent area in the region of the furcation. Only advanced furcation exposures where both cortical plates are gone will be easily recognized on radiographs. Bone still fills most of the area where the roots meet.