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ORAL HISTO > ENAMEL > Flashcards

ENAMEL Flashcards

0
Q

Under pits and fissures

A

Tentlike - apex & base

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1
Q

Direction of rods in cusp tip

A

Vertical

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2
Q

Proximal surfaces

A

Horizontal

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3
Q

Cervical

A

Horizontal

Oblique

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4
Q

Deciduous teeth

A

Oblique coronally

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5
Q

Permanent teeth

A

Oblique apically

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6
Q

Surrounds each enamel rod

A

Interrod enamel

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7
Q

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

A

Interrod enamel

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8
Q

Boundary bet enamel rod and interrod

A

Enamel rod sheath

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9
Q

More acid resistants and more org matl or enamel proteins

A

Enamel rod sheath

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10
Q

Fish scale appearance

A

Enamel rod sheath

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11
Q

For increase strength

A

Enamel rod sheath

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12
Q

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

A

Enamel rod sheath

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13
Q

Are arranged in rows of alternating orientations

A

Enamel rods

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14
Q

Incremental lines or growth lines

A

Striae of retzius

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15
Q

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

A

Striae of retzius

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16
Q

Horse shoe shaped in the dentinal core

A

Striae of retzius

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17
Q

Striae of retzius in

Cross section:

A

CONCENTRIC RINGS

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18
Q

Striae in longitudinal section:

A

OBLIQUE

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19
Q

Disturbance of enamel formation during birth

A

Neonatal line

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20
Q

Parallel oblique lines

A

Striae of retzius

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21
Q

Alternating constrictions and expansions of the rods

A

Transverse striations

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22
Q

Cross striations occurring at a rate of

A

4mm/day

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23
Q

Daily variations in the secretory activity by ameloblasts

A

Transverse striations

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24
Q

Optical phenomenon due to the change in direction of enamel rods

A

Bands of hunter schreger

25
Q

They appear as dark and light zones

A

Bands of hunter schreger

26
Q

Dark bands

Rods cut TRANSVERSELY PERPENDICULAR to the long axis

A

Diazones

27
Q

Light bands
FISH SCALE
Rods cut parallel

A

Parazones

28
Q

Resembles tufts of grass

A

Enamel tufts

29
Q

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

A

Enamel tufts

30
Q

LOWER INORG CONTENT (hypomineralized enamel)

A

Enamel tufts

31
Q

Are avenue for the lateral spread of caries at the dej

A

Enamel tufts

32
Q

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

A

Enamel tufts

33
Q

Grass
Occurs developmentally
Lateral spread of caries in dej
Hypomineralized enamel

A

Enamel tufts

34
Q

Visible cracks
Starts at surface of enamel
Develop during enamel formation

A

Enamel lamellae

35
Q

Extensions of odontoblast

Extending for a short distance into enamel

A

Enamel spindle

36
Q

RESIDUAL TUBULES

formed when ODONTOBLASTIC PROCESSES extend across the DEJ during ODONTOGENESIS

A

Enamel spindle

37
Q

Causes HYPERSENSITIVITY along the DEJ

A

Enamel spindle

38
Q

This type of microlinkage

increases attachment of enamel and dentin

A

Scalloped dej

39
Q

Scalloped dej is towards the

A

Enamel

40
Q

Process of enamel formation

A

Amelogenesis

41
Q

Stages of amelogenesis

A

Presecretory
Secretory
Maturation
Protective

42
Q

Phases of presecretory stage

A

Morphogenetic phase

Org and differentiation

43
Q

Determines the form and shape of crown

A

Membrana preformativa

44
Q

Determines if ant or post teeth

A

Cells of iee

45
Q

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

A

Morphogenetic phase of presecretory stage

46
Q

Preparatory stage to secrete enamel

A

Differentiation phase of presecretory stage

47
Q

Stage where in ameloblasts develop an extensive protein synthetic apparatus

A

Differentiation phase of presecretory stage

48
Q

What stage?

SECRETING ENAMEL

A

Secretory stage

49
Q

PROJECTION in ameloblast at SECRETORY END

A

Tome’s process

50
Q

Tome’s process project to the

A

Basal lamina or membrana preformativa

51
Q

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

A

Secretory stage

52
Q

What stage?

Ameloblasts lose their TOME’s PROCESS

A

Maturation stage

53
Q

What stage?

Crystals grow in length and diameter at the expense of matrix protein and fluid

A

Maturation stage

54
Q

Maturation cycle

A

Ruffled ended ameloblasts

Smooth ended ameloblasts

55
Q

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

A

Ruffled ended ameloblasts

56
Q

Permitting EXIT or REMOVAL of PROTEIN & WATER

20%of maturation cycle

A

Smooth ended ameloblasts

57
Q

25-30% mineralization

PARTIAL MINERALIZATION OF ENAMEL

A

Primary calcification

58
Q

2 phases of maturation stage

A

Primary calcification

Secondary calcification

59
Q

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

A

Protective stage

60
Q

Cells of REE

A

Iee
Oee
Stellare reticulum
Stratum intermedium

ORAL HISTO (11 decks)

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