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  • Title: Zinc effect on the in vitro formation of calcium phosphates: relevance to clinical inhibition of calculus formation.
    Author: LeGeros RZ, Bleiwas CB, Retino M, Rohanizadeh R, LeGeros JP.
    Journal: Am J Dent; 1999 Apr; 12(2):65-71. PubMed ID: 10477985.
    Abstract:
    PURPOSE: To determine the effect of zinc on the in vitro formation of calcium phosphates and its relevance to calculus inhibition. MATERIALS AND METHODS: Different types of calcium phosphate phases (amorphous calcium phosphate, ACP; dicalcium phosphate dihydrate, DCPD; octacalcium phosphate, OCP; and carbonate hydoxyapatite, CHA) were precipitated from solutions containing increasing concentrations of zinc (Zn) ions. The precipitates were characterized using x-ray diffraction, infrared absorption spectroscopy, and scanning electron microscopy. RESULTS: The presence of Zn ions affected the type and amount of calcium phosphate phases formed. Zn, even at concentrations as low as 0.1 mM/L, inhibited the crystal growth of DCPD, OCP and AP; and, at higher concentrations (0.5 mM to 2 mM/L), promoted the formation of amorphous calcium phosphate, ACP, or Zn-substituted tricalcium phosphate (beta-TCP) depending on the reaction pH and temperature.
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