Embryology
What will rathkes pouch become?
Pituitary gland
First stage to occur, and during what weeks of pregnancy?
Initiation, 6-7 weeks
What is the process of dentin forming?
Dentinogenesis
What stage comes first? Characterized by what?
Pre-eruptive phase. NOT erupted. Past until crown is fully formed.
What is the appearance of clean enamel?
Shiny, smooth, hard
Membrane dividing the mouth from pharynx
Buccopharyngeal Membrane
This stage has growth of the tooth bud... becoming a TOOTH GERM
Cap Stage (3rd) (9-10 weeks in pregnancy)
What is the process of Enamel forming?
Amelogenesis
What is the name for the pathway through bone for tooth to erupt?
"Guiding Point"
Gubernacular Cord
What percent of enamel is organic?
So how about inorganic?
organic: 4%
Inorganic: 96%
What separates arches?
Grooves call pharyngeal Pouches
What does the enamel organ become? And the enamel knot?
The outer enamel of tooth. The knots becomes the cusps tips
What are like ropes that fill the space between odontoblasts?
Korff's Fibers
Where do permanent teeth erupt in relation to primary teeth?
Lingually
How many ameloblasts are needed to make 1 enamel rod?
4!
1 Head, 2 Neck, 1 Tail
What arch becomes maxilla, mandible, muscles of mastication, vessels, and nerves
Arch 1
Stage characterized by proliferation.
Bud Stage (2nd stage) (8th week in pregnancy)
What process secretes enamel matrix?
Tomes Process
What 4 events happen to characterize the eruptive phase?
1. Start of root formation
2. Tooth movement, rise toward surface
3. penetration, part of crown can be seen clinically
4. Occlusal/Incisal movement - continues erupting until meets antagonist
What are the dark and light bands called?
Hunter-schreger bands
What groove/pouch becomes the palatine tonsils?
2nd POUCH
Name the 4 cell types of the enamel organ
1. Outer Enamel Epithelium
2. Stellate Reticulum
3. Stratum Intermedium
4. Inner Enamel Epithelium
What triggers cementogenesis?
HERS disintegration
How many years can the roots take to fully complete? Give both primary and permanent.
Primary: 1-1.5 years
Permanent: 2-3 years
Where do you find gnarled and intertwined rods?
Cusp tips