Tooth Development Flashcards
What are teeth composed of?
Pulp, Cementum, Dentine, An Amelodentine junction, Enamel
Composition of enamel?
96% mineral, 1-2% matrix and 2% water
Composition of dentine?
70% mineral, 20% matrix and 10% water
Composition of Cementum?
65% mineral, 23% matrix and 12% water
Composition of Bone?
60% mineral, 25% matrix and 15% water
What covers the anatomical crown?
Enamel
What is enamel produced by?
Epithelium
What is dentine?
Specialised connective tissue
What is cementum?
Mineralised connective tissue
What does cementum cover?
The tooth root
Functions of cementum?
Provides tooth support and is resistant to resorption
What does interactions between the epithelium give rise to?
Enamel and the hyaline layer of the root
What does interactions between the mesenchyme give rise to?
Dentine, pulp, cementum, peridontium-peridontal ligament and bone
When does tooth development begin?
Week 6
What are the stages of tooth germ?
Bud, Cap, Bell, Late bell ad Crown
When does Bud stage occur?
Week 8
What does the inner enamel epithelium form?
Amaloblasts
What do amaloblasts produce?
Enamel
What does the ectomesenchyme form?
Dental papilla and dental follicle
What does the dental papillae form?
Odontoblasts
What do the odontoblasts produce?
Dentine and pulp
What does the dental follicle produce?
Cementum and bone
What is cytodifferentiation?
The process of the dental papilla forming odontoblasts
What is mineralisation?
Where predestine mineralised to form dentine
What is amelogenesis?
Where the inner enamel epithelium forms ameoblasts
What do ameloblasts secrete?
The enamel protein matrix
What does the enamel protein matrix undergo?
Immediate mineralisation
What is enamel with 30% mineral known as?
Immature enamel
What does immature enamel undergo?
Gradual maturation
What forms the root of the tooth?
Cementum and dentine
What provides the signal for the development of the root?
The root sheath
What is enamel made of?
Enamel prism
What is the shape of an enamel prism?
Complex key hole
What is gnarled enamel?
Where the prisms appear twisted around each other
Where is the gnarled enamel found?
At the cusps
What does gnarled enamel provide?
Strength
What do systematic disturbances cause within the teeth?
Accented lines
What is contained within the dentine tubules?
Cell processes, nerves and fluid
What aspect of dentine is innervated?
Inner aspect
What happens with pulp volume with age?
Decreases
What is around the odontoblasts?
Marginal plexus
What is the cell free zone?
Plexus of Raschkow
