McMillian Flashcards
what are the stages of tooth development?
Initiation
Bud
Cap
Bell
What week does odontogenesis occur?
6th Prental week
What are the two tissue types of initiation of odontogenesis
- Oral epithelium (Dental Lamina) 2. Ectomesenchyme
Steps of Initiation of Odontogenesis 2 steps
- Formation of all hard tissues and soft tissue surrounding the tooth
- Induction is the main process involved
Hard tissue of teeth
Enamel
Dentin
Cementum
Soft tissue of teeth
PDL
pulp
What is the primary epithelial Band formation ?
week 6-7
- Thickened epithelium (ectoderm) in location of future jaw
- Rapid Cell Division
Primary Epithelial Band Formation gives rise to …
Dental Lamina and Vestibular Lamina
Bud Stage occurs at which week?
8th week prenatally
What happens in Bud Stage?
Dental Lamina grows into a bud and penetrates/influences the growing ectomesenchyme
What does the stellate reticulum make?
Glycosaminoglycans (attracts water)
The Bud becomes the
Enamel organ shaped like a cap (Cap stage)
In the Cap Stage Mesenchyme becomes
Dental Papilla
In the cap stage Inner Enamel epithelial cells become
Ameloblasts
What makes the Ameloblasts ?
Inner enamel epithelial cells
What are Ameloblasts?
Cells during tooth development that deposit tooth enamel
What are Stellate Reticulum ?
Star shaped cells connected to each other Makes Glycosaminoglycans
In the cap stage the dental follicle surrounding ?
Dental Papilla and Enamel Organ
Developmental Abnormalities occurring in the Cap Stage
- Dens in dente (Dens Invaginalis)
- Fusion
- Gemination
Dens in dente ( dens invaginalis)
- Tooth within a tooth
- Enamel organ expands more than it should and it invaginates into the dental papilla
(Cap Stage)
Fusion
- Fewer number of teeth
- Extra wide crown with one pulp cavity
- Union of two teeth by dentin and enamel
(Cap Stage)
Gemmination
- Correct Number of Teeth
- Wide Bifid Crown
- One tooth germ attempting to divide into two
What makes the tooth germ ?
- Enamel Organ
- Dental Papilla
- Dental Follicle
Histodifferentiation
Bell Stage
- In the enamel organ
- Stellate reticulum →inner & outer enamel epithelia