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Crystallography of supragingival and subgingival human dental calculus.

Abstract
Selected area electron diffraction of sections and individual crystal fragments of human dental calculus has demonstrated that octacalcium phosphate, hydroxyapatite and whitlockite form the inorganic part of both supragingival and subgingival dental calculus. However, the major constituents in supragingival calculus are platelet-shaped crystals of octacalcium phosphate and needle-shaped crystals of hydroxyapatite, while bulk crystals of whitlockite is the predominant component in subgingival calculus. The subgingival samples seemed to be better crystallized than the supragingival ones. The results obtained by the electron optical and X-ray powder investigations are in good agreement.
AuthorsM Sundberg, J Friskopp
JournalScandinavian journal of dental research (Scand J Dent Res) Vol. 93 Issue 1 Pg. 30-8 (Feb 1985) ISSN: 0029-845X [Print] Denmark
PMID2984764 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Calcium Phosphates
  • Hydroxyapatites
  • octacalcium phosphate
  • whitlockite
  • Durapatite
  • calcium phosphate, dibasic, dihydrate
Topics
  • Calcium Phosphates (analysis)
  • Crystallization
  • Crystallography
  • Dental Calculus (analysis, pathology)
  • Durapatite
  • Gingiva
  • Humans
  • Hydroxyapatites (analysis)
  • Microscopy, Electron
  • X-Ray Diffraction

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