title: Incidence of periodontal disease in relation to class II silver amalgam restorations.
mesh_terms: D003723:Dental Amalgam / Q000009:adverse effects*; D003773:Dental Plaque / Q000209:etiology*; D003793:Dental Restoration, Permanent; D006801:Humans; D010510:Periodontal Diseases / Q000209:etiology*
chemical_list: D003723:Dental Amalgam