title: Structure of sub- and supragingival dental calculus in human periodontitis. An electron microscopic study.
mesh_terms: D000328:Adult; D000368:Aged; D003461:Crystallography; D003728:Dental Calculus / Q000032:analysis / Q000150:complications / Q000382:microbiology / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D010518:Periodontitis / Q000150:complications