consists of 70% mineral and 30% organic material. Hydroxyapatite (HA) comprises 95% of the mineral and the other 5% comprises complex salts with magnesium, fluorine, sodium, potassium, and chlorine. The organic part consists of 98% matrix, where collagen type I comprises 95% and noncollagenous proteins 5%. The remaining 2% of organic material are the cells, osteoblasts, osteocytes, osteoclasts, and lining cells.