ENAMEL

Question 0

Under pits and fissures

Answer 0

Tentlike - apex & base

Question 1

Direction of rods in cusp tip

Answer 1

Vertical

Question 2

Proximal surfaces

Answer 2

Horizontal

Question 3

Cervical

Answer 3

Horizontal

Oblique

Question 4

Deciduous teeth

Answer 4

Oblique coronally

Question 5

Permanent teeth

Answer 5

Oblique apically

Question 6

Surrounds each enamel rod

Answer 6

Interrod enamel

Question 7

With crystals wc are oriented at a DIFFERENT DIRECTION from the rod crystals

Answer 7

Interrod enamel

Question 8

Boundary bet enamel rod and interrod

Answer 8

Enamel rod sheath

Question 9

More acid resistants and more org matl or enamel proteins

Answer 9

Enamel rod sheath

Question 10

Fish scale appearance

Answer 10

Enamel rod sheath

Question 11

For increase strength

Answer 11

Enamel rod sheath

Question 12

Along a small portion of the circumference of the rod there is NO

Answer 12

Enamel rod sheath

Question 13

Are arranged in rows of alternating orientations

Answer 13

Enamel rods

Question 14

Incremental lines or growth lines

Answer 14

Striae of retzius

Question 15

Run from the DEJ in an oblique direction to the OCCLUSAL SURFACES

Answer 15

Striae of retzius

Question 16

Horse shoe shaped in the dentinal core

Answer 16

Striae of retzius

Question 17

Striae of retzius in

Cross section:

Answer 17

CONCENTRIC RINGS

Question 18

Striae in longitudinal section:

Answer 18

OBLIQUE

Question 19

Disturbance of enamel formation during birth

Answer 19

Neonatal line

Question 20

Parallel oblique lines

Answer 20

Striae of retzius

Question 21

Alternating constrictions and expansions of the rods

Answer 21

Transverse striations

Question 22

Cross striations occurring at a rate of

Answer 22

4mm/day

Question 23

Daily variations in the secretory activity by ameloblasts

Answer 23

Transverse striations

Question 24

Optical phenomenon due to the change in direction of enamel rods

Answer 24

Bands of hunter schreger

Question 25

They appear as dark and light zones

Answer 25

Bands of hunter schreger

Question 26

Dark bands | Rods cut TRANSVERSELY PERPENDICULAR to the long axis

Answer 26

Diazones

Question 27

Light bands FISH SCALE Rods cut parallel

Answer 27

Parazones

Question 28

Resembles tufts of grass

Answer 28

Enamel tufts

Question 29

HYPOMINERALIZED ENAMEL from the dej to about 1/5 - 1/3 of the thickness of enamel

Answer 29

Enamel tufts

Question 30

LOWER INORG CONTENT (hypomineralized enamel)

Answer 30

Enamel tufts

Question 31

Are avenue for the lateral spread of caries at the dej

Answer 31

Enamel tufts

Question 32

Occurs developmentally due to the abrupt changes in the direction of grps of rods

Answer 32

Enamel tufts

Question 33

Grass Occurs developmentally Lateral spread of caries in dej Hypomineralized enamel

Answer 33

Enamel tufts

Question 34

Visible cracks Starts at surface of enamel Develop during enamel formation

Answer 34

Enamel lamellae

Question 35

Extensions of odontoblast | Extending for a short distance into enamel

Answer 35

Enamel spindle

Question 36

RESIDUAL TUBULES | formed when ODONTOBLASTIC PROCESSES extend across the DEJ during ODONTOGENESIS

Answer 36

Enamel spindle

Question 37

Causes HYPERSENSITIVITY along the DEJ

Answer 37

Enamel spindle

Question 38

This type of microlinkage | increases attachment of enamel and dentin

Answer 38

Scalloped dej

Question 39

Scalloped dej is towards the

Answer 39

Enamel

Question 40

Process of enamel formation

Answer 40

Amelogenesis

Question 41

Stages of amelogenesis

Answer 41

Presecretory Secretory Maturation Protective

Question 42

Phases of presecretory stage

Answer 42

Morphogenetic phase | Org and differentiation

Question 43

Determines the form and shape of crown

Answer 43

Membrana preformativa

Question 44

Determines if ant or post teeth

Answer 44

Cells of iee

Question 45

What stage? Membrane - form and shape of crown Iee- ant or post teeth

Answer 45

Morphogenetic phase of presecretory stage

Question 46

Preparatory stage to secrete enamel

Answer 46

Differentiation phase of presecretory stage

Question 47

Stage where in ameloblasts develop an extensive protein synthetic apparatus

Answer 47

Differentiation phase of presecretory stage

Question 48

What stage? | SECRETING ENAMEL

Answer 48

Secretory stage

Question 49

PROJECTION in ameloblast at SECRETORY END

Answer 49

Tome's process

Question 50

Tome's process project to the

Answer 50

Basal lamina or membrana preformativa

Question 51

What stage? Amelo extend projections thru MP MP is fragmented and removed ACTIVE DEPOSITION OF ENAMEL MATRIX

Answer 51

Secretory stage

Question 52

What stage? | Ameloblasts lose their TOME's PROCESS

Answer 52

Maturation stage

Question 53

What stage? | Crystals grow in length and diameter at the expense of matrix protein and fluid

Answer 53

Maturation stage

Question 54

Maturation cycle

Answer 54

Ruffled ended ameloblasts | Smooth ended ameloblasts

Question 55

Allows incorporation of inorg matl MINERAL GO DOWN 80% of the maturation cycle

Answer 55

Ruffled ended ameloblasts

Question 56

Permitting EXIT or REMOVAL of PROTEIN & WATER | 20%of maturation cycle

Answer 56

Smooth ended ameloblasts

Question 57

25-30% mineralization | PARTIAL MINERALIZATION OF ENAMEL

Answer 57

Primary calcification

Question 58

2 phases of maturation stage

Answer 58

Primary calcification | Secondary calcification

Question 59

What stage? Laying down of primary epithelial cells Ameloblasts become LOW CELLS (IEE cells) and become a part of REE

Answer 59

Protective stage

Question 60

Cells of REE

Answer 60

Iee Oee Stellare reticulum Stratum intermedium