Calcium Apatites and Other Calcium Orthophosphates - Calcium Orthophosphates: Applications in Nature, Biology and Medicine - page 10

Table 1.2 Comparative composition and structural parameters of inorganic phases of adult human calcified tissues. Due to the

considerable variation found in biological samples, typical values are given in these cases [27, 107]

Composition, wt% Enamel Dentine Cementum Bone HA

Calcium [a] 36.5 35.1 ~35 34.8 39.6

Phosphorus (as P) [a] 17.7 16.9 ~16 15.2 18.5

Ca/P (molar ratio) [a] 1.63 1.61 ~1.65 1.71 1.67

Sodium [a] 0.5 0.6

[c]

0.9 —

Magnesium [a] 0.44 1.23 0.5-0.9 0.72 —

Potassium [a] 0.08 0.05

[c]

0.03 —

Carbonate (as CO 3 2− ) [b] 3.5 5.6

[c]

7.4 —

Fluoride [a] 0.01 0.06 up to 0.9 0.03 —

Chloride [a] 0.30 0.01

[c]

0.13 —

Pyrophosphate (as P O 7 4− ) [b] 0.022 0.10

[c]

0.07 — 2

Total inorganic [b] 97 70 60 65 100