Tooth formation and development

Question 1

The dental lamina is from _______

Answer 1

ectoderm NOT MESENCHYME

Question 2

Tooth formation begins in this week of development

Answer 2

6th

Question 3

Permanent tooth development begins from _______ month of development to the _______ month of age.

Answer 3

5th month development(centrals)

10th month of age(2nd Premolar)

Question 4

Problems in the initiation stage of tooth development can lead to anodontia and supernumerary teeth.

a. initiation
b. bud stage
c. cap stage
d. bell stage

Answer 4

initiation

Question 5

The _______ stage of tooth development begins in the 8th week followed by the _______ stage from 9-10th week, and the _______ stage from 11-12th week.

Answer 5

bud
cap
bell

Question 6

The cap is called the Enamel/dental organ and forms the _______ and initiates _______ formation

Answer 6

enamel

dentin

Question 7

The ball of ectomesenchyme that the bud wraps around is called the dental papilla and it forms the

Answer 7

dentin and pulp

Question 8

The dental lamina comes from ectoderm while the dental follicle and dental papilla are from _______

Answer 8

ectomesenchyme

Question 9

The dental follicle dorms the supporting structures of the tooth(peridontium) by differentiating into:
_______-form cementum
_______-form alveolar bone
_______- form PDL, connecting cementum,and alveolar bone

Answer 9

Cementoblasts-form cementum
osteoblasts-form alveolar bone
Fibroblasts- form PDL, connecting cementum,and alveolar bone

Question 10

Problems in this stage of tooth development can cause gemination, fusion, dens in dente, and tubercle formation

Answer 10

cap stage

Question 11

The crown shape is determined in what stage of tooth development

Answer 11

bell stage

Question 12

The _______layer of enamel epithelium is a thin layer of cells helps to shape and provide nutrition for the enamel organ.
The _______layer of enamel epithelium is also a thin layer and differentiates into ameloblasts and produce enamel

Answer 12

outer- nutrition and shape

inner- ameloblasts->enamel

Question 13

The outer and inner enamel epithelium join at the _______ loop which will grow into hertwigs epithelial root sheath and determine the root _______

Answer 13

cervical loop

root shape

Question 14

Problems in this phase of tooth development can lead to macro/microdontia, dentinogenesis imperfecta, hutchinsons incisors and mullberry molars

Answer 14

bell stage

Question 15

What happens to the dental lamina after the Bell stage?

Answer 15

extends lingually and gives rise to the successional dental lamina of permanent teeth

Question 16

The oldest enamel in the tooth lies

Answer 16

at the DEJ under a cusp

Question 17

_______ induces amelogenesis

Answer 17

dentinogenesis

Question 18

Once enamel formation is complete the four layers of the enamel organ become one and form the

Answer 18

reduced enamel epithelium

Question 19

Problems in this stage(post bell stage) can cause enamel dysplasia, concrescence, enamel pearls

Answer 19

apposition

Question 20

The tooth begins to calcify at the

Answer 20

DEJ

Question 21

The primary function of dental pulp is

Answer 21

form dentin

Question 22

What percentage of dentin is organic

Answer 22

20-30%

Question 23

Phosphoryn

Answer 23

non collagenous protein component of dentin matrix

Question 24

Secondary dentin is formed in response to

Answer 24

stimuli produced by carious penetration of the tooth