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  2. Calculus (dental) - Wikipedia

    en.wikipedia.org/wiki/Calculus_(dental)

    octacalcium phosphate, Ca 8 H 2 (PO 4) 6 · 5 H 2 O; and brushite, CaHPO 4 · 2 H 2 O; The organic component is approximately 85% cellular and 15% extracellular matrix. [5] Cell density within dental plaque and calculus is very high, consisting of an estimated 200,000,000 cells per milligram.