Bell Stage:
This occurs for primary dentition between the eleventh and the twelfth week of prenatal development. It is characterised by the continuation of the process of proliferation, differentiation and morphogenesis. Differentiation produces four types of cells within the enamel/dental organ:
At the same time, the dental papilla undergoes differentiation and produces two types of cells:
The dental sac (follicle) increases its collagen content and differentiates at a later stage than the enamel/dental organ and the dental papilla.
- Inner enamel epithelium
- Outer enamel epithelium
- Stellate reticulum
- Stratum intermedium
At the same time, the dental papilla undergoes differentiation and produces two types of cells:
- Outer cells of the dental papilla that forms the dentin secreting cells (odontoblasts).
- Central cells of the dental papilla which forms the primordium of the pulp
The dental sac (follicle) increases its collagen content and differentiates at a later stage than the enamel/dental organ and the dental papilla.