<unk>  periodontal disease is caused by a mixed bacterial infection that includes anaerobes such as P. intermedia and Fusobacterium as well as spirochetes, such as Treponema.<unk>  may also be associated with diseases in which the immune system is compromised, including HIV/AIDS.<unk>  is an opportunistic infection that occurs on a background of impaired local or systemic host defenses. The predisposing factors for<unk>  are smoking, psychological stress, malnutrition, and immunosuppression. The following zones of infection have been described (superficial to deep): the bacterial zone, the neutrophil rich zone, the necrotic zone and the spirochetal zone.
Acute necrotizing ulcerative gingivitis
Denture-related stomatitis
Contact stomatitis
Idiopathic facial aseptic granuloma
Chronic sclerosing sialadenitis
Disseminate and recurrent infundibulofolliculitis
Aphthous stomatitis
Dental abscess