Late tooth development Flashcards
Why is the primary enamel knot a special region
‘signalling centre’
secretes signalling molecules that influence proliferation + differentiation of the cells of developing tooth germs
The primary enamel knot is a transient structure present at ….. stage and later eliminated by programmed ……. …… (apoptosis)
cap
cell death
The primary enamel knot marks the position of the ……. …….. cusp of ……
first
buccal
molars
What does monocuspid and muticuspid mean
Incisors/canines
molars
The IEE and OEE meet at the …… ……… to form the …….. ……. ……… which forms …….. formation
cervical loop
Hertwigs root sheath
root
What is avascular (lack of blood vessels)
What is high conc of blood vessels
Dental follicle/loose connective tissue
inner layer and outer layer
What gives rises to the tooth outline
What stage is the crown shape established
IEE
Bell stage
What teeth is the secondary enamel knot present and when does it develop
molars
bell stage
When do tooth buds for permanent teeth begin to form
late bell stage (20th week)
What does the accessional lamina connect
backward extension of dental lamina
1st, 2nd and 3rd molar
What is a tooth with a predecessor called
successional tooth
tooth with primary tooth before perm
What is a tooth without a predecessor called
accessional tooth
no primary tooth before perm
The dental lamina break downs at the …… ……. …… and breaks up into ……… pearls of …….
late bell stage
epithelial
serres
Tooth renewal among species:
monophyodont
diphyodont
polyphyodont
mouse - single teeth - no replacement
humans + most mammals - 2nd generation of teeth
reptiles - multiple generations of teeth
Some mammals can have continuous development of teeth due to the permanent …….. ………. and because of ….. signalling
dental lamina
Wnt
