Image 12 shows an endoperio lesions; the pattern of bone loss often resembles a "J" shape.
Class II perioendo lesionsoccur when the loss of attachment (periodontal disease) extends apically to a lateral canal or to the apical delta leading
to pulpal necrosis. Class II perioendo lesions often affect the mandibular first molar and appear as one "floating" root without
alveolar support, with a periapical endodontic lesion affecting the other tooth root (Image 13).
Image 13 Class II perioendo lesions often affect the mandibular first molar.
Class III perioendo lesions are true combined separate endodontic and periodontal lesions, which have coalesced.
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