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Perio #1 > Anatomy of the Periodontium Part II #2 > Flashcards

Anatomy of the Periodontium Part II #2 Flashcards

1
Q

Junctional Epithelium attaches to _________.

A

Enamel

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2
Q

Biological width is the ______ and ________.

A

JE and CT

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3
Q

______ is capable of becoming JE.

A

Oral epithelium

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4
Q

What are the 4 main differences between JE and OE?

A

Size of cells (JE>OE because its more active)
Size of Intracellular space (JE>OE b/c cells are bigger)
# of desmosomes = JE

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5
Q

T or F, JE has many desmosomes.

A

False, it has very few.

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6
Q

What is passive eruption?

A

Where tooth continues to erupt causing apical movement of JE (till it is below the CEJ often) *No inherent loss of JE here though.

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7
Q

_______ occurs when JE migrates apically down root surface.

A

Attachment loss

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8
Q

What happens with necrosis of junctional epithelium?

A

JE cells die, and bone is exposed. There IS a actual loss of JE here, not just attachment loss.

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9
Q

What are the 4 main fibers of the gingival connective tissue-lamina propria?

A
  1. Collagen = most abundant
  2. Reticulin = numerous adjacent to basment membrane
  3. Oxytalan = mostly in PDL, run parallel to long axis of tooth and keep blood vessels open during chewing.
  4. Elastic = around blood vessels (keeps blood vessels from being squished during mastication)
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10
Q

What are the 4 types of Gingival fiber?

A
  1. Circular fibers = around the tooth
  2. Dentoginigval fibers = from supracrestal cementum to free gingiva.
  3. Dentoperiosteal fibers = run from supracrestal cementum into attached gingiva
  4. Trasseptal fibers = run from tooth to tooth.
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11
Q

What is the width of the PDL?

A

about 0.25mm

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12
Q

Describe the structure of the PDL…

A

Richly vascularized and cellular CT surrounding the roots and join the cementum and alveolar bone.

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13
Q

What are the 4 types of PDL fibers?

A
  • alveolar crest fibers
  • horizontal fibers
  • oblique fibers
  • apical fibers
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14
Q

What are the 7 cells of the PDL and what do they do?

A
  1. Fibroblasts = align along principal fibers
  2. Osteoblasts = line bone surface
  3. Cementoblasts = line cemental surface
  4. Osteoclasts = multi nucleated, crete ruffled surface of bone
  5. Nerve fibers
  6. Epithelial rest of Mallassez = remnants of the Hertwig’s epithelial root sheath.
  7. Epithelial cells
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15
Q

Cementum is similar to bone in composition except for……

A
  • no blood vessels in cementum
  • no lymph vessels
  • no innervation
  • no physiological resorption/remodeling
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16
Q

What are Intrinsic Cemental fibers?

A

Produced b cementoblasts

- composed of fibers oriented parallel to root.

17
Q

What are Extrinsic Cemental fibers?

A

Sharpey’s fibers

- produced by PDL fibroblasts

18
Q

What type of Cemental fibers are found coronal or middle portion of root?

A

Acellular, extrinsic fiber cementum

19
Q

What type of Cemental fibers are found in apical third of the root and furcations?

A

Cellular, mixed stratified cementum

20
Q

What type of Cemental fibers are found in resorption lacunae?

A

Cellular, Intrinsic fiber cementum

21
Q

What happens to cementum throughout life?

A

Thickness increases

22
Q

What is the thickness of cementum in the cervical (upper) portion of the root?

A

20-50 um

23
Q

What is the thickness of cementum in the apical portion of the root?

A

150-250 um

24
Q

What cells form alveolar bone?

A

Cells from dental follicle and other cells independent of tooth development

25
Q

______ produce bone matrix consisting of collagen fibers, glycoproteins and proteoglycans.

A

Osteoblasts

26
Q

______ undergoes mineralization by the deposition of minerals.

A

Osteoid

27
Q

Describe blood supply to gingiva…..

A

Via supraperiosteal vessels that are terminal branches of buccal, mental, sublingual, facial……

28
Q

Describe blood supply to PDL…

A

Dental A.
Sup. and Inf. alveolar A
Intra-septal A
Rami perforantes A

29
Q

Describe the nerves of the Periodontium…

A

End branches of the trigeminal nerve:

  • infraorbital
  • sublingual
  • mental
  • Buccal
  • PSD
  • Greater palatal
  • long sphenopalatine

Perio #1 (9 decks)

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