Histological Development of Teeth

Question 1

Odontogenesis

Answer 1

The formation of tooth tissues from stem cells originating in the ECTODERM primary germ layer

Question 2

Ameloblast

Answer 2

Formed from preameloblasts. Once the basement membrane disintegrates, the preameloblasts then contact predentin.

Question 3

Odontoblast

Answer 3

derive from dental papilla
connective tissue
outer cells
next to the basement membrane
produce dentin matrix which then hardens to form dentin
softer than enamel
after producing dentin odontoblasts end up in the pulp
odontoblastic processes of cytoplasm found in dentinal tubercles

Question 4

Cementoblast, cementocyte

Answer 4

Cementoblast: derive from the dental sac (follicle)
produce cementum soft then mineralizes into hard cementum

Cementocyte: cells trapped in the cementum
cementoblasts that become trapped in the cementum

Question 5

Fibroblast

Answer 5

A cell in connective tissue that produces collagen and other fibers

Question 6

Reduced enamel epithelium

Answer 6

forms a protective layer over the enamel after the full thickness of the enamel has been formed and mineralized. Protects until tooth erupts. Combines with the oral ectoferm at the surface to form the sulcus. Forms the junctional epithelium

Question 7

Fibroblast

Answer 7

A cell in connective tissue that produces collagen and other fibers

Question 8

Hertwig’s epithelium root sheath

Answer 8

originates from the IEE and OEE and continues to grow apically

HERS induces peripheral cells in the dental papilla to differentiate into odontoblasts that will then secrete the dentin of the root

Fragments as soon as dentin is formed so that HERS is only seen as a thin band of cells around the most apical portion of the growing root

Question 9

Rests of Malessez

Answer 9

small clusters of epithelial cells that are remnants of HERS fragments

Remain in the PDL throughout the life of the tooth

Have the potential to develop into cysts

Question 10

Hydroxyapatite

Answer 10

a mineral of the apatite group that is the main inorganic constituent of tooth enamel and bone, although it is rare in rocks.

Question 11

Gives rise to dental tissues/Tooth development

Answer:
Neural Crest Cell
Mesoderm
Ectoderm

Answer 11

Neural Crest Cells