Maturation Stage (Crown Stage):
This stage is characterised by the completion of calcification. Hard tissues including enamel and dentin develop during this stage. Formation of dentin, known as dentinogenesis, is the first identifiable feature of this stage. The formation of dentin must always occur before the formation of enamel. The different stages of formation of dentin results in different types of dentin: mantle dentin, primary dentin, secondary dentin and tertiary dentin.
Odontoblasts (The dentin forming cells):
These are different from the mesenchyme of the dental papilla and it occurs after the differentiation of pre-AB begins. They begin secreting an organic matrix, closest to the area of the future cusp of a tooth, and this organic matrix contains collagen fibres. The odontoblasts are responsible for the odntoblasts process.
The odontoblasts process causes the secretion of hydroxyapatite crystals and the mineralisation of the matrix. This area is known as mantle dentin. Mantle dentin forms from the pre-existing ground substance of the dental papilla. Primary dentin forms through different process whereas the secondary dentin is formed after finishing of the root formation. Tertiary dentin (reparative dentin) forms as a result of stimuli for example dentin carries.
Enamel formation is known as Amelogenesis and occurs in the crown stage of the tooth development. Generally speaking, the enamel formation takes place in two stages: the secretion and maturation stages.
In the secretion stage, ameloblasts release enamel proteins that contribute to the enamel matrix. The appearance of this mineralised tissue occurs usually around the third or fourth month of pregnancy.
In the maturation stage, the ameloblasts transports some of the substances used in formation of enamel out of the enamel and so the function of ameloblasts also changes into the transportation of substances. Most of the minerals transported by ameloblasts in this stage are proteins used to complete mineralisation. By the end of this stage, the enamel has completed its mineralisation.
Odontoblasts (The dentin forming cells):
These are different from the mesenchyme of the dental papilla and it occurs after the differentiation of pre-AB begins. They begin secreting an organic matrix, closest to the area of the future cusp of a tooth, and this organic matrix contains collagen fibres. The odontoblasts are responsible for the odntoblasts process.
The odontoblasts process causes the secretion of hydroxyapatite crystals and the mineralisation of the matrix. This area is known as mantle dentin. Mantle dentin forms from the pre-existing ground substance of the dental papilla. Primary dentin forms through different process whereas the secondary dentin is formed after finishing of the root formation. Tertiary dentin (reparative dentin) forms as a result of stimuli for example dentin carries.
Enamel formation is known as Amelogenesis and occurs in the crown stage of the tooth development. Generally speaking, the enamel formation takes place in two stages: the secretion and maturation stages.
In the secretion stage, ameloblasts release enamel proteins that contribute to the enamel matrix. The appearance of this mineralised tissue occurs usually around the third or fourth month of pregnancy.
In the maturation stage, the ameloblasts transports some of the substances used in formation of enamel out of the enamel and so the function of ameloblasts also changes into the transportation of substances. Most of the minerals transported by ameloblasts in this stage are proteins used to complete mineralisation. By the end of this stage, the enamel has completed its mineralisation.