Primary dentin differs from secondary and reparative dentin in that:
1). Its matrix is calcified
2). Its inorganic component is hydroxyapatite
3). It usually has greater number of tubules per unit area
4). It is produced by mesenchymal cells
📝 Explanation:
Primary dentin is the most regular and dense. Secondary dentin has fewer tubules and is more wavy. Tertiary or reparative dentin has even fewer, irregular, and often atubular areas. All are calcified with hydroxyapatite and made by mesenchymal odontoblasts.
MCQ