title: Periodontal disease--reexamined.
mesh_terms: D000539:Alveolar Process / Q000473:pathology; D001862:Bone Resorption / Q000209:etiology / Q000473:pathology; D002118:Calcium / Q000172:deficiency; D006801:Humans; D010024:Osteoporosis / Q000150:complications; D010510:Periodontal Diseases / Q000209:etiology* / Q000473:pathology
chemical_list: D002118:Calcium