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DOH > Cementum > Flashcards

Cementum Flashcards

1
Q

formative cell of cementum

A

cementoblast

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2
Q

formative organ of cementum

A

dental sac

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3
Q

embryonic origin

A

ectomesenchyme

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4
Q

terminal ends or periodontal ligament inserted in the cementum/ alveolar bone

A

sharpey’s fibers

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5
Q

Represent periodic deposition of successive new layer of cementum

A

Sharpey’s fibers

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6
Q

growth lines, same direction as
dentino-cemental junction

A

Incremental lines of Salter

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7
Q

Consist of normal assembly of proteoglycans,
glycoproteins and phosphoproteins

A

Non collagenous Ground Substance

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8
Q

found in periodontal ligament/outside of the cementum that are round, plump cells with basophilic cytoplasm

A

cementoblast

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9
Q

hemataoxyphilic nucleus with little cytoplasm

A

resting cementoblasts

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10
Q

reside in cemento matrix or inside the cementum

A

cementocytes

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11
Q

spaces within the matrix which houses the cell bodies of cementocytes.

A

lacunae

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12
Q

Elongated, tiny spaces housing the processes -Processes
are directed towards periodontal ligaments to acquire nutrients
since cementum is avascular.

A

Canaliculi

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13
Q

Morphology of the Cemento-enamel junction

A

60% overlaps, 30% butt joint, 10% Gap/exposed dentin

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14
Q

Also known as Coronal or Cervical Cementum. It contains neither cementocytes nor no collagen fibrils and it is the product of cementoblasts. May also overlap enamel at DEJ

A

Acellular Afibrillar Cementum

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15
Q

also called primary cementum or fibrous cementum that has extrinsic fibers (sharpey’s fiber) coming from the periodontal ligament. It has no cells but has fibers that are diagonal or perpendicular to long axis of tooth. A product of cementoblast and seen in cervical portion to midroot portion, directly on the external dentinal surface

A

Acellular Extrinsic Fiber Cementum

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16
Q

Also known as Secondary cementum. continuously forming due to stimuli and is usually located in near in apical third but may cover the entire cementum. It contains cementocytes and has both sharpey’s fibers and intrinsic bundles of collage fibers. It is a product of cementoblasts and is maintained by cementocytes

A

Cellular Mixed Fiber Cementum

17
Q
  • contains cementocyte and intrinsic
    bundles of collagen fibrils
  • exclusive products of cementoblast
    formed only during reparative
    process
  • No extrinsic fibers
  • Filling in of resorption lacunae and
    repair of root fractures.
A

Cellular Intrinsic Fiber Cementum

18
Q
  • 1st layer of cementum formed on dentin
  • main purpose: Seals the tubules of dentin
  • formed directly on the dentin surface
  • Product of epithelial rest of Malassez
  • Deposited in the inner layer of the epithelial cells of the root
    sheath
  • Harder consistency
A

Intermediate Cementum

19
Q

between the root dentin and
cementum (usually smooth and straight in permanent teeth)

A

Dentino-Cemental Junction

20
Q
  • longer and slower, capacity to feel the
    resoption area, ability to reestablish the original root.
  • Can fill the entire resorbed area
  • Established the normal area
  • Slow process
  • Entire surface is restored to its actual Reestablish outline of
    cementum
A

Anatomical repair

21
Q

– only forms cementum on a certain area
of restoration, original root is not established.
- Functional repair- only form cementum on a certain area of
that resorption (not the whole area)
- Fill only the resorption lacuna
- Can’t re-established the original area
- Fast and rapid repair

A

Functional repair

22
Q

2 types of repair of cementum

A

Anatomical and functional repair

23
Q

fine collagen fibers which lies parallel to the surface of the cementum

A

intrinsic fibers

24
Q

Part of the CEJ that is that occurs in 60% of teeth and the most common

A

Overlapping

25
Q

Cementum meets the enamel forming a distinct CEJ that occurs in 30% of teeth and is the most second common

A

Butt-joint

26
Q

A gap occurs between cementum and enamel that exposes root dentin and occurs in 10% of teeth

A

Gapped CEJ

27
Q

An extension of enamel organ that extends apically to the root and the cervical loop

A

Hertwig’s Epithelial Root Sheath

28
Q

Acellular, formed slowly and covers coronal 2/3 of the root

A

Primary cementum

29
Q

Cellular, found more rapidly and covers apical 2/3 of the root

A

secondary cementum

30
Q

2 cells of the cementum

A

Cementoblasts and cementocytes

DOH (1 decks)

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