Tooth Development Flashcards
What are the stages of tooth development?
IBCBAMR
Initiation
Bud
Cap
Bell
Apposition
Maturation
Root formation and eruption
Tell me about initiation.
Induction process of molecular signals b/t epi and CT results in growth of dental lamina into the CT
Tell me about the bud stage.
Proliferation of dental lamina into a small, rounded structure overlying an area of condensed CT
Tell me about the cap stage.
Further growth of bud
Becomes indented, and covers the CT called the dental papilla
Cells of the cap are differentiated into 4 layers
Tell me about the bell stage.
Growth of enamel organ into a bell-shaped structure w/ 4 distinct layers overlying the dental papilla that has the shape or outline of the future tooth
Tell me about the apposition stage
Formation of crown by dentingenesis and amelogenesis w/ deposition of dentin protein - collagen - and enamel protein - amelogenin - and the beginning of calcification
**Ameloblasts from the IEE induce adjacent cells fo the dental papilla to become odontoblasts that then produce the dentin matrix when in turn induces the preameloblasts to become ameloblasts that produce enamel matrix
Tell me about the maturation stage.
Crown completion by further deposition of the enamel and dentin and completion of calcification at the cervical area
An extension of the IEE and OEE forming a bilayered root sheath that induces the formation of the root
Tell me about the root formation and eruption stage.
Root forms as the tooth erupts
Root sheath induces odontoblasts to form root dentin and then it disintegrates allowing cells from the dental follicle to become cementoblasts and contribute to the formation of cementum and PDL
What is the enamel organ?
Arises from oral ectoderm and dental lamina and will form enamel
Develops different layers in the cap and bell stages
What is the dental papilla?
Arises form ectomesenchyme
Condensed zone of cells beneath enamel organ
-THIS WILL FORM DENTIN AND PULP
What is the dental sac/follicle?
Fibrous tissue from ectomesenchyme and will form cementum, PDL, and alveolar bone
LOOK AT THE PHOTOS YOU DREW.
Seriously. Do it.
