title: Biological basis for placement of crown margins.
mesh_terms: D003442:Crowns / Q000009:adverse effects; D003779:Denture Design; D005881:Gingiva / Q000033:anatomy & histology*; D005882:Gingival Diseases / Q000209:etiology; D006801:Humans; D010510:Periodontal Diseases / Q000628:therapy