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Cariology (Prelims) > Enamel And Its Significance In The Study Of Cariology > Flashcards

Enamel And Its Significance In The Study Of Cariology Flashcards

1
Q

An acellular, avascular, and highly mineralized material that covers the anatomic crown of a tooth.

A

Enamel

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2
Q

Thickness of the enamel at the incisal edges of incisors

A

2mm

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3
Q

The enamel gets progressively thinner towards the CEJ.

A

False

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4
Q

A hard, stiff, and wear resistant tissue.

A

Enamel

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5
Q

The 96% inorganic material in the enamel.

A

Hydroxyapatite

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6
Q

Development of the dental lamina from the oral epithelium.

A

Initiation stage

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7
Q

Proliferation of the dental lamina into ectomesenchyme.

A

Bud stage

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8
Q

Proliferation and differentiation to form the tooth germ.

A

Cap stage

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9
Q

The innermost margin of the cap shape of the enamel organ forms the future crown form of the tooth, such as cusps.

A

Enamel knots

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10
Q

Differentiation of the enamel organ and dental papilla into different layers.

A

Bell stage

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11
Q

Differentiation of preameloblast to ameloblasts and beginning of amelogenesis from Tomes process.

A

Apposition stage

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12
Q

Not a true process, and is the projection of the secretiry end of each ameloblast that faces the DEJ

A

Tomes process

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13
Q

Fuses with the oral epithelium then degenerates.

A

Reduced Enamel Epithelium (REE)

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14
Q

Green-gray residue of the fused tissue of the REE and oral epithelium.

A

Nasmyth membrane/Primary enamel cuticle

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15
Q

The 4 lobes of the anterior teeth.

A

Medial, labial, distal, lingual

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16
Q

Deep invaination of the enamel surface, resulting from failure of the developmental lobes to coalesce.

A

Fissures

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17
Q

Non-coalesced enamel at the deepest point of a fossa

A

Pits

18
Q

Fundamental crystalline organizational unit of enamel

A

Enamel rods

19
Q

The enamel rods are prismatic in cross-section but become irregular once fully matured

A

True

20
Q

Structural components of enamel rods that are millions of small and vary in size and shape

A

Apatite crystallites

21
Q

Organically rich interspace

A

Rod sheath

22
Q

Pit and Fissure caries appears smaller than assumed at the surface

A

False

23
Q

Occurs near the cervical regions and incisal and occlusal areas, and is not subject to fracture as much as regular enamel.

A

Gnarled enamel

24
Q

Alternate light and dark zones of varying widths that have slightly different permeability and organic content.

A

Hunter-Schreger Bands

25
Q

Hypomineralized enamel structures of the enamel rods and interrod substance that project between adjacent groups of rods from teh DEJ

A

Enamel tufts

26
Q

Odontoblasts that crossed the basement membrane before it mineralized into the DEJ

A

Enamel spindles

27
Q

Thin, leaf-like faults between enamel rod groups that extend from the enamel surface to the DEJ, sometimes into dentin.

A

Enamel lamellae

28
Q

The enamel lamellae contain mostly inorganic material.

A

False

29
Q

Series of alternating grooves formed when striae of Retzius circles are incomplete at the enamel surface

A

Imbrication lines of Pickerill

30
Q

Elevations between the grooves, usually continuous around a tooth and usually lie parallel to the CEJ and each other.

A

Perikymata

31
Q

The interface of enamel and dentin.

A

Dentinoenamel Junction

32
Q

Outline of the DEJ

A

scalloped or wavy

33
Q

The enamel hardness and density decreases towards the DEJ.

A

True

34
Q

Teeth have very thin enamel that chips off or have no enamel at all, and there are yellow crowns due to exposed dentin.

A

Amelogenesis imperfecta

35
Q

Type of Amelogenesis Imperfecta with defective matrix formation and the enamel is not formed to full normal thickness.

A

Type I: Hypoplastic Amelogenesis Imperfecta

36
Q

Reduction in quantity of enamel matrix; pitting and grooves on the enamel surface.

A

Enamel hypoplasia

37
Q

Type of Amelogenesis Imperfecta wherein the enamel crystallites remain immature, normal thickness. The defective enamel can be chipped away from the dentin matrix using an instrument under firm pressure.

A

Type II: Hypomature Amelogenesis Imperfecta

38
Q

Reduction in the quality of the enamel maturation; opaque, yellower, or even browner due to intrinsic staining.

A

Enamel hypocalcification

39
Q

Caused by excessive systemic fluoride during enamel matrix formation and calcification

A

Fluorosis

40
Q

Pit and fissure take up the configuration following the direction of enamel rods wherein the broader base is oriented towards the enamel surface

A

True

41
Q

Gnarled enamel appears as concentric circles in enamel due to the incremental formation of the enamel

A

False

Cariology (Prelims) (4 decks)

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