title: Histological changes in experimental periodontal disease in rats monoinfected with gram-negative organisms.
mesh_terms: D000818:Animals; D001424:Bacterial Infections / Q000473:pathology*; D001862:Bone Resorption / Q000209:etiology*; D005856:Germ-Free Life; D010518:Periodontitis / Q000150:complications / Q000473:pathology*; D051381:Rats