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Which occurs first in development, shape or layers?
shape occurs first and then tissues are laid down to form layers
process of differentiation of special cells to form enamel, dentin, cementum and pulp
Three stages of morphodifferentiation
1. Bud stage (8th wk) 2. Cap stage (9th - 10th wk) 3. Bell stage (11th - 12th wk) (none can happen until have jaw and arch appearance)
Completion of morphodifferentiation occurs
when the Bell stage is complete (have complete crown shape of tooth)
Four layers of enamel organ
1. Inner enamel epithelium 2. Stratum intermedium 3. Stellate reticulum 4. Outer enamel epithelium
Inner enamel epithelium
differentiates into ameloblasts the form enamel matrix. epithelial cells communicate with dental papilla
First communication is
morphodifferentiation (instructs oral epithelium to thicken and grow down into CT to shape the tooth)
Steps of Morphodifferentiation
1. must have epithelial tissue and CT with cells communicating 2. oral epithelium thickens and grows down into CT forming a bud 3. tooth germ now connected to oral epithelium by dental lamina 4. continues growing apically and outward forming a cap 5. continues growing until crown shape is complete (bell stage) 6. cytodifferentiation can now begin in the crown
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