Tooth Embryology

3 stages

bud, cap, bell

what does the stratum intermedium do?

transfers nutrients from the inner enamel epithelium to the ameloblasts, supporting enamel production

what happens at bud stage

8 week embryo development, enamel forms from swellings of dental lamina

what happens at cap stage

growth and expansion of enamel organ, week 12 inner columnar epithelium forms which define the crown shape and later develops into ameloblasts. dental papilla and follicles develop and cervical loop forms hertwigs root sheath.

what happens at bell stage

dental lamina breaks down ready for formation of dental hard tissues

how is dentine formed - the process name

dentinogenesis

explain dentinogenesis

inner enamel epithelium induces dental papilla odontoblasts. these secrete predentine matrix which mineralises to form calcospherites which fuse to form mineralized dentine.

1st layer of dentine formed called what

mantle dentine

rest of dentine formed called what

circumpulpal dentine

whats process of forming enamel called

amelogenesis

amelogenesis

cells from inner enamel epithelium differentiate to form ameloblasts. these secrete enamel matrix from tomes process which mineralise to form hydroxyapatite. the ameloblasts retreat leaving rods which later required in crown stage.

Hydroxyapatite

Ca10(PO4)6(OH)2

roots formation process name

hertwigs root sheath

cementum formation process name

cementogenesis

cementogenesis

dental follicle cells differentiate to form cementoblasts which secrete a matrix and mineralise.

what is name of unmineralised cementum

cementoid

PDL formation

dental follicles differentiate to form fibroblasts which secrete collagen.

enamel spindles

extend across ADJ enamel to dentine

enamel tufts

extend from ADJ into enamel

enamel lamellae

from enamel towards ADJ but doesnt reach