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Table 1 Typical compositional values of the inorganic phase of adult human calcified tissues [182]

From: Bioactive calcium phosphate materials and applications in bone regeneration

Composition

Enamel

Dentin

Bone

Hydroxyapatite

Calcium [wt.%]

36.5

35.1

34.8

39.6

Phosphorus [wt.%]

17.7

16.9

15.2

18.5

Ca/P (molar ratio)

1.63

1.61

1.71

1.67

Sodium [wt.%]

0.5

0.6

0.9

–

Magnesium [wt.%]

0.44

1.26

0.72

–

Potassium [wt.%]

0.08

0.05

0.03

–

Carbonate [wt.%]

3.5

5.6

7.4

–

Fluoride [wt.%]

0.01

0.06

0.03

–

Chloride [wt.%]

0.30

0.01

0.13

–

Pyrophosphate [wt.%]

0.022

0.10

0.07

–

Total inorganic [wt.%]

97

70

65

100

Total organic [wt.%]

1.5

20

25

–

Water [wt.%]

1.5

10

10

–

Ignition products (800 °C)

β-TCP + HAP

β-TCP + HAP

HAP + CaO

HAP