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histo 2 > melfi 1 > Flashcards

melfi 1 Flashcards

1
Q

What is the only direction a tooth does NOT move normally?

A

apically

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2
Q

Does tooth movement occur throughout life?

A

yes

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3
Q

What cells are involved in eruption?

A

cells of the PDL:

cementoblasts, osteoblasts, osteoclasts (from bone marrow), fibroblasts

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4
Q

What functions do fibroblasts serve in the PDL?

A

secretes extracellular substance

lysis extracellular substance (“fibroclast”)

can become a contracting cell called a fibromyocyte myofibroblast

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5
Q

How does a fibromyocyte (myofibroblast) work?

A

cell is connected by integrins to principle collagen fiber bundles that connect the tooth to alveolar bone. when the cell contracts the collagen fibers contract, moving the tooth

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6
Q

What glycoprotein exhibits properties that serves as an integrin that binds to extracellular components such as collagen?

A

fibronectin

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7
Q

What are the three stages of eruption

A
  1. Preemergence
  2. Prefunctional
  3. Functional
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8
Q

What is the main direction of movement in the preemergence stage

A

facially

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9
Q

What is the main direction of movement in the pre functional stage

A

occlusally

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10
Q

What is the main direction of movement in the functional stage

A

mesially

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11
Q

What important events occur during pre emergence stage

A 
appearance of tooth germ
appearance of crown dentin
appearance of pulp chamber
enamel formation
enamel organ becomes REE
Hertwig's sheath forms (determines # root canals)
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12
Q

What is the make up of immature enamel?

A

70% organic (mature is 1% organic)

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13
Q

What are the two main functions of Hertwig’s epithelial root sheath

A

determines # of root canals

determines root dentin outline

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14
Q

During the pre emergence stage, are roots present?

A

NO but the number of root canals is determined by HERS

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15
Q

What attaches the REE to enamel

A

basal lamina

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16
Q

When does the pre functional stage begin and end

A

starts with root dentin formation

ends when tooth reaches occlusal plane

17
Q

What are some important events during the pre functional stage

A

start of root dentin formation

break up of HERS

cementogenesis

formation of PDL

REE becomes JE

entrance into oral cavity

18
Q

What are some important events during the functional stage

A

continued dentin and cementum formation

age changes (decrease pulp chamber, attrition, etc)

19
Q

Where does cementogenesis begin?

A

cervically

20
Q

Where does cementum form?

A

on exposed dentin

HERS needs to break up so that cemenetogenesis can begin. starts cervically.

21
Q

What are epithelial rests of malassez? When do they appear

A

remnants of epithelial cells from HERS located in the PDL

appear during pre functional stage

22
Q

When does cell death of the merged oral and REE occur?

A

pre functional

23
Q

What does junctional epithelium usually attach to?

A

cementum (in its final stage–also attaches to enamel during eruption)

24
Q

When does the functional stage begin and end

A

starts at occlusal plane

continues through life

25
Q

What stage is associated with “physiological mesial drift”

A

funtional

26
Q

How does the JE attachment change during functional eruption

A
  1. attached to enamel
  2. attached to enamel and cementum
  3. attached to cementum
27
Q

When does functional arrangement of principle fiber bundles of PDL occur?

A

functional stage

28
Q

What is the term for the physiologic elimination of primary teeth caused by the resorptive action of odontoclasts

A

shedding

29
Q

Where do osteoclasts originate

A

bone marrow, travel to site of activity via blood vessels

30
Q

What are openings in the bone located lingual to primary anterior teeth called? What is their function?

A

gubernaculum canals

a gubernacular ligament is attached to the succedaneous tooth and helps guide the tooth into the oral cavity

histo 2 (8 decks)

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