Tooth Development

Question 1

Odontogenesis

Answer 1

Tooth development!

Question 2

Primary teeth develop during:

Answer 2

Embryonic + Fetal

Question 3

Permanent teeth develop during:

Answer 3

Fetal

Question 4

Stages of Tooth Development

Answer 4

Initiation, Bud, Cap, Bell, Apposition + Maturation

Question 5

Initiation Stage

Answer 5

6-7 week (embryonic)
Stomodium
[induction], # of teeth present!?
*anodontia, supernumerary

Question 6

Bud Stage

Answer 6

8th week (embryonic)
Proliferation! Size of teeth!
*relative or complete micro/macro-it

Question 7

Cap Stage

Answer 7

9-10 weeks (fetal)
Morphogenesis! Tooth form
*dens n dents, gemination, fusion, tubercles

Question 8

Bell Stage

Answer 8

11-12 weeks (fetal)
Differentiation!
^Dental papilla within enamel organ undergoes

Question 9

Apposition Stage

Answer 9

[secretory]

enamel/dentin/cementum secreted in matrix layers

Question 10

Maturation Stage

Answer 10

[final]

Full mineralization of hard tissue enamel/dentin/cementum

Question 11

Dens in dente

Answer 11

Enamel organ invaginates into dental papilla (tooth within tooth)
Prosecutes lingual pits
(Cap stage)

Question 12

Gemination

Answer 12

Tooth germ unsuccessfully divides into two tooth germs. Crown “twinning” occurs w enlarged pulp cavity
(Cap stage)

Question 13

Fusion

Answer 13

Union of two adjacent tooth germs.
Denton, enamel united; two separate/distinct pulp cavities
(Cap stage)

Question 14

Enamel dysplasia

Answer 14

Esthetic, color changes from faulty enamel development from ameloblast > enamel pitting
(Apposition+Maturation stage)

Question 15

Concrescence

Enamel pearl

Answer 15

Union of root structures (during single root formation)
Enamel sphere on root (during multi root formation)
(Apposition+Maturation)

Question 16

Tubercles

Answer 16

Enamel extensions forming extra cusps

Cap

Question 17

Dental Papilla tissue layers

Answer 17

Outer cells : differentiate to odontoblast
Central cells : differentiate into primordial of pulp
(Will produce dentin + pulp)
CAP STAGE

Question 18

Enamel Organ

Answer 18

Derived from ectoderm, future cap shaped deepest part of bud

Question 19

Dental Sac

Answer 19

CAP STAGE

derived from ectomesencyme

Question 20

Tooth Germ

Answer 20

Enamel organ + dental papilla + dental sac

CAP STAGE

Question 21

OEE

Answer 21

Outer enamel epithelium. Cuboidal cells. Protects and supplies enamel organ

Question 22

IEE

Answer 22

Inner enamel epithelium. Columned cells. Will differentiate into ameleoblasts.

Question 23

Stellate reticulum

Answer 23

Star shaped cells. Shrinkage.

CAP

Question 24

Stratum intermedium

Answer 24

Cuboidal cells. High allowing phosphate enzyme

CAP

Question 25

OEE > Stellate reticulum > stratum intermedium > IEE

Answer 25

Layers that support enamel production

CAP

Question 26

Preameloblast

Answer 26

Elongated columner cells repolarize > turn into dentin forming cells (odontoblasts)

Question 27

Odontoblast

Answer 27

Dentin forming cells - begin dentogenesis

Question 28

Dentogenesis

Answer 28

Apposition also growth of predentin

Question 29

Ameloblast

Answer 29

Begin amelogenesis- appositional growth of enamel matrix

Question 30

DEJ

Answer 30

[dentinenamel junction]

Question 31

Root Stuff

Answer 31

HERS, cementoblast, cementoid, cementocytes,

Question 32

DCJ

Answer 32

Dentinocemental junction

ROOT

Question 33

HERS

Answer 33

[hertwig epithelial root sheath]

Shapes the root. Formed by cervical loop growth away from crown