Development Of Tooth

Front 1

Firat sign of tooth development

Back 1

Proliferation of oral ectodermal cells to form an epithelial thickening called primary epithelial band.

Front 2

When is primary epithelial band (PEB) formed

Back 2

6th week of IUL

Front 3

2 divisions of PEB?

Back 3

Lingual- dental lamina

Buccal- vestibular lamina

Hint 3

Lingual and buccal

Front 4

Which division of PEB contributes to formation of teeth

Back 4

Dental lamina

Front 5

What gives rise to enamel organ

Back 5

Dental lamina that proliferates as tooth buds (10) for deciduous teeth

Front 6

What is succesional lamina

Back 6

Lingual extension of deciduous tooth germs that give rise to permanent successors

Front 7

Permanent molars develop from?

Back 7

From distal extension of DL, known as accessional lamina.

Front 8

Average pd of activity of DL

Back 8

5 years

Front 9

Remnants of DL

Back 9

Cell rests of serres

Front 10

Cells of tooth germ are prganised into how many parts

Back 10

3: enamel organ, dental papilla, dental sac/ follicle

Front 11

What does dental sac/follicle give rise to?

Back 11

Cementum, PDL, alveolar socket

Front 12

What comes first morpho or histo-differentiation?

Back 12

Morpho

Front 13

What is the significance of initiation

Back 13

Decides number and location of teeth. Disturbance causes more(supernumerary) or less teeth.

Front 14

Significance of proliferation

Back 14

Provides adequate cellsfor further development of tooth germ and also contributes to tge determination os shape of crown.

Front 15

Significance of morphodifferentiation

Back 15

Undifferentiated(bud) to differentiated ( cap ) stage

Front 16

Formative cells? Derived from?

Back 16

Ameloblasts, inner enamel epithelium

Odontoblasts, dental papilla

Front 17

What is basement membrane called at morphodifferentiation

Back 17

Membrana performativa

Front 18

What determines the shape, size and number of roots of tooth

Back 18

HERS

Front 19

What is essential for proper histo-differentiation

Back 19

Interaction between IEE and DP

Front 20

Amelogenesis imperfecta? Cause?

Back 20

Defective enamel formation, caused by defective histo-differentiation of ameloblasts

Front 21

Enamel hypoplasia?

Back 21

Common condition due to any systemic or local factors that affect the activity of ameloblasts, cause arrest or interruption of matrix deposition

Front 22

Stellate reticulum?

Back 22

Characteristic of cap stage, central cells of EO polyhedral in early stage, network of stellate shaped cells in later stage.

Front 23

Role of enamel knot in tooth development

Back 23

Cells of enamel knot express several signalling molecules, together with mesenchymal signals, playing important role in regulating the patterning of cusps and hence shape of tooth.

Front 24

Role of enamel cord

Back 24

Determination of crown pattern

Front 25

Enamel niche

Back 25

When sections of developing teeth ar e prepared in a single plane, it appears as if the EO is attached to the oral epithelium by two dental laminae, one buccal, one lingual separated by area filled with mesenchymal tissue, called as enamel niche

Front 26

Significance of collapse of stellate reticulum

Back 26

OEE becomes irregular and folded, allowing the capillaries to become more closer to ameloblasts to ensure adequate nutritional supply

Front 27

Function of REE

Back 27

Covers the newly formed enamel and protects it till the tooth erupts into the oral cavity.

Also plays an important role in establishing dento gingival junction