Tooth Development 1 Flashcards
When does the development of the face begin and how many processes form around the primitive mouth (stomodeum)
- 4th week of intra-uterine life
- 5 processes
When does the development of the primary dentition begin?
Between weeks 6 and 7
How does the primary epithelial band form?
The embryo’s oral epithelium thickens via the thickening of cells in the superficial layer and multiplication of cells in the basal layer.
Where is Ectomesenchyme derived from?
Neural crest cells (NCCs) that have migrated to the region from neuroectoderm of the embryo.
What happens by week 7?
Dental Lamina formation
What divides into two processes to begin the development of the lip and jaw?
The primary epithelial band
What does the first process produce and what does it contribute to?
- the Buccal Placed Vestibular Lamina
- contributes to the development of the vestibule of the mouth (lining of lips, cheek and buccal sulcus)
What does the second process produce and what does it contribute to?
- the Lingual Placed Dental Lamina (an arch shaped thickening of the epithelium)
- contributes to development of the teeth
How does the dental lamina begin to form and how does it progress?
Initially forms in the midline and progresses posteriorly
What happens to the dental lamina by week 8?
- Increases in length
- develops a series of swellings (early developing tooth germs)
What is tooth development split into?
Initiation, morphogenesis and histogenesis
What is initiation?
The development of individual tooth sites along dental lamina with 10 deciduous (primary) develop sequentially along each arch.
What is induction?
Active interaction between the embryologic tissue types
What is Morphogenesis?
Gives rise to the individual tooth shape
What is morphogenesis influenced by?
Genetic programming and cell signalling from interactions between epithelial (ectodermal) and mesenchymal cells.
