lecture 1

Question 1

first sign of tooth development

Answer 1

6-7 weeks

Question 2

deciduous teeth begin to calcify at

Answer 2

13-20 weeks

Question 3

by ____ weeks in utero all deciduous teeth have begun to calcify

Answer 3

18-20 weeks

Question 4

deciduous teeth erupt at

Answer 4

6-30 monthsf

Question 5

horseshoe shaped, corresponds to future dental arches and gives rise to dental lamina/vestibular lamina

Answer 5

primary epithelial band

Question 6

the neural crest mesenchyme induces what to become the dental lamina

Answer 6

oral ectoderm

Question 7

this stage is cellular proliferation

Answer 7

bud stage

Question 8

tooth germ of early cap stage

Answer 8

enamel organ (enamel of the tooth)
and
dental papilla (dentin outer and pulp inner)

Question 9

enamel knot formation happens when

Answer 9

during cap stage

Question 10

key signaling center consist of cluster of non-dividing cells determines cusp formation. primary and secondary

Answer 10

enamel knot

Question 11

supper structures (cementum/periodontium/alveolar bone)

Answer 11

dental follicle

Question 12

during cap stage, cells in the enamel organ synthesize _____ into the ECM. this is hydrophilic and pulls water in to enamel organ

Answer 12

glycosaminoglycans

Question 13

stage where stratum intermedium formation occurs, the crown attains full size and shape, and under surface of epithelium deepens

Answer 13

bell stage

Question 14

stage where
1. morphofifferentation
2. junction of IEE and OEE is called cervical loop

Answer 14

early bell stage

Question 15

OEE shape:
IEE shape:

Answer 15

OEE cuboidal
IEE- columnar

Question 16

what is the cervical loop

Answer 16

junction of OEE and IEE which is also the future site of the CEJ

Question 17

this stage is when the dental lamina breaks and separates the tooth from oral epithelium

Answer 17

late bell stage

Question 18

IEE differentiates into

Answer 18

amerloblasts to form enamel and odontoblasts to form dentin

Question 19

stages of the lifecycle of ameloblasts (enamel formation)

Answer 19

1. morphogenetic stage
2. histodifferentation stage
3. initial secretory stage (no tome’s process)
4. secretory stage (tome’s process)
5. ruffle ended ameloblast of the maturation stage
6. smooth ended ameloblast of the maturation stage
7. protective stage

Question 20

this stage of enamel formation has intense synthetic and secretory activity, forms ENAMEL RODS and INTER ROD, secrete granules on the newly formed mantle dentin

Answer 20

4. secretory stage

Question 21

first layer of dentin formed by newly differentiated odontoblasts, hypomineralized, and only in the crown of the tooth

Answer 21

mantle dentin

Question 22

dentin formed during tooth development

Answer 22

primary dentin

Question 23

dentin formed after tooth eruption

Answer 23

secondary dentin

Question 24

dentin produced in response to injury to protect pulp

Answer 24

tertiary dentin

Question 25

IEE and OEE form the _____ which proliferates downward to form double layered structure called _______ also the site of the CEJ

Answer 25

cerivcal loop hertwig's root sheat

Question 26

what is mostly removed before cementum is laid down

Answer 26

fragments of hertwig's root sheath

Question 27

remnants of HERS are called

Answer 27

rests of malassez

Question 28

cementum is acellular and cellular

Answer 28

acellular lines outside of root cellular is at apex

Question 29

what two things are formed from mesenchyme development

Answer 29

dental papilla (dentin and pulp) and dental follicle (cementum, PDL, and alveolar bone)

Question 30

what is formed via epithelium development

Answer 30

enamel