Early Dental Development

Question 1

the dental laminae develop at what week of intra uterine life?

Answer 1

6 weeks

Question 2

what shape is the dental lamina?

Answer 2

horse shoe shaped

Question 3

when does tooth development begin?

Answer 3

in the 6th week of embryonic life- in womb

Question 4

epithelial swellings (buds) develop
20 in total what are these called?

Answer 4

the enamel organs of the primary teeth

Question 5

Dental development is a continuous process but stages are defined according to the shape of the enamel organ what are the 4 stages?

Answer 5

bud stage
cap stage
bell stage
late bell stage

Question 6

what happens at the bud stage?

Answer 6

enamel organ increases in size and changes shape

Question 7

what does the cap stage consist of?

Answer 7

enamel organ increasing in size and changing shape
dental papilla
dental follicle

Question 8

what happens at the bell stage

Answer 8

further increase in size of enamel organ and dental papilla

Question 9

what happens at the late bell stage?

Answer 9

enamel organ differentiates into 4 layers
Outer enamel epithelium
Inner enamel epithelium
Stratum intermedium
Stellate reticulum

Question 10

The cells of the inner enamel epithelium elongate and differentiate into

Answer 10

Ameloblasts

Question 11

Before enamel is deposited, cells of the dental papilla adjacent to the new ameloblasts, become

Answer 11

odontoblasts

Question 12

Once the dental papilla is enclosed in fully formed dentine it is known as the

Answer 12

dental pulp

Question 13

The outer surface of pulp contains

Answer 13

odontoblasts

Question 14

The layer of fibrous tissue forming a capsule around the enamel organ, remains in place until tooth eruption
Eventually becoming

Answer 14

periodontal ligament

Question 15

what is the term for the epithelial buds which develop along dental lamina and later gives rise to each tooth? how many develop on each tooth?

Answer 15

enamel organs
10 develop (for 10 deciduous teeth that will develop in each arch)

Question 16

what is the term used for the process of enamel formation

Answer 16

amelogenesis

Question 17

when enamel is formed its not fully calcified as more calcium salts are added until it reaches its full density this is termed what?

Answer 17

enamel maturation

Question 18

what is the first stage of dentine formation called?

Answer 18

pre dentine

Question 19

what is the name for the layer of cells which covers the formed crown prior to eruption to the tooth?

Answer 19

the reduced enamel epithelium

Question 20

what is the epithelial tube which leads to the formation of the root of a tooth?

Answer 20

hertwigs sheath

Question 21

when the hertwigs sheath disintegrates, the residual remnants are called what?

Answer 21

the epithelial rests of malassez

Question 22

what is the name of the cells that form cementum?

Answer 22

cementoblasts

Question 23

initially 3 layers are visible when developing periodontal ligament when does this differentiation disappear?

Answer 23

once the tooth has erupted into position of occlusion

Question 24

what are the cells which form the periodontal fibres called?

Answer 24

fibroblasts