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Oral Histology Exam II (BLW) > Eruption and Shedding > Flashcards

Eruption and Shedding Flashcards

1
Q

TERM – the movements a tooth makes to attain and maintain its position in the jaw

**From the tooth’s formative stages wintin the jaws to its functional stage in the oral cavity

A

Eruption

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2
Q

True or False?

A tooth will move all directions during eruption except apically

A

True

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3
Q

Name the 3 stages of tooth eruption

1.

2.

3.

A
  1. Pre-emergence
  2. Pre-functional
  3. Functional
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4
Q

Name the MAIN direction of tooth movement in each eruption stage

  1. Pre-emergence
  2. Pre-functional
  3. Functional
A
  1. Pre-emergence —— FACIALLY
  2. Pre-functional —– OCCLUSALLY
  3. Functional —– MESIALLY
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5
Q

A tooth will continue to erupt until it reaches the ___________ __________

A

Occlusal Plane

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6
Q

Review: Name the 4 stages leading to the enamel organ

A
  1. Dental Lamina
  2. Bud
  3. Cap
  4. Bell
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7
Q

During the pre-emergence stage, cells will concentrate at the apical end of the tooth germ called the ______ ______

A

Follicle Sac

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8
Q

After enamel is complete, 4 cell layers of enamel organ become 1 _____ _____ _____

A

Reduced Enamel Epithelium

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9
Q

What is the function of the REE?

A

Protects enamel during eruption

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10
Q

The cervial loop is where the outer and inner layers of enamel organ come together and form 2 _____ _____ ____ _____

A

Hertwig’s Epithelial Rooth Sheaths

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11
Q

The REE is attached to the enamel surface by a ______ _____

A

Basal Lamina

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12
Q

The REE is known as the last secretion of ______

A

Ameloblasts

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13
Q

Herwig’s epithelial rooth sheath determines 2 things:

1.

2.

A
  1. # root canals (not roots)
  2. Root dentin outline
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14
Q

True or False

Pre-emergence stage begins after root formation

A

FALSE

Pre-emergence stage begins BEFORE root formation

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15
Q

At what stage are the # of root canals determined?

A

Pre-emergence stage

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16
Q

Mandibular first molars have ____ root canals in the MESIAL root

Mandibular canines also can have ____ root canals in their single root

A

2

2

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17
Q

3 types of cells that differentiate during the pre-emergence stage

A
  1. Ameloblasts
  2. Odontoblasts
  3. Fibroblasts
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18
Q

At what stage does crown dentin first appear?

A

Pre-emergence

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19
Q

At what stage does the pulp chamber occur?

A

Pre-emergence

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20
Q

When is the DEJ estabilished?

A

Pre-emergence

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21
Q

What type of cells are NOT present during the pre-emergence stage

A

Cementoblasts

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22
Q

Bone ________ occurs during the pre-emergence stage

A

Remodeling

23
Q

Fate of the Hetwig’s Epithelial Root Sheath Cells

  1. Diaphragm Stage
  2. Sheath elongation
  3. Root Dentin Formation
A
  1. Diaphragm stage – number or RC’s determined; tooth erupts occlusally
  2. Sheath elongates – determines the root dentin outline – diaphragm stays relatively at the same level
  3. Rooth dentin forms – sheath breaks up; cementum forms on exposed dentin…. continues apically intil th eroothdentin outline is complete
24
Q

TERM – remanents of epithelial cells from Herwig’s rooth sheath in the PDL (during pre-functional stage)

They surround the tooth as part of the PDL

A

Epithelial Rest of Malassez

25
Q

During the ____-______ stage, the merged oral epithelium and the reduced enamel epithelium undergo cell death

A

Pre-functional Stage

26
Q

What is the most painful stage of tooth eruption and why?

A

Pre-functional stage (babies teething)

The inflammation and infection is responsible for this pain! Not necessarily the eruption of the teeth.

27
Q

During the pre-functional stage, the merged oral epithelium and reduced enamel epithelium undergo _____ _____

This is because of lack of ____ _____ to transport nutrients

All because of the pressure the erupting teeth are putting on the overlying oral tissue

A

Cell Death

Blood vessels

28
Q

Once the crown of the tooth has made its entry into the oral cavity, the reduced enamel epithelium now becomes —?

A

Junctional Epithelium

29
Q

At what spot on the tooth does the juntional epithelium typically stop at during pre-functional stage

A

CEJ

30
Q

What attaches the juntional epithelium to the tooth surface?

A

Basal lamina

31
Q

The pre-functional stage begins with the start of ______ formation

A

Dentin

32
Q

What “breaks up” during the pre-functional stage?

A

Herwig’s Epithelial Root Sheath

33
Q

Differentiation of cementoblasts & cementogenesis occurs during the ____-_____ stage

A

pre-functional stage

34
Q

How are the fibers of the PDL arranged?

A

Obliquely – NOT functionally arranged in groups

35
Q

When does the pre-functional stage end?

A

When the erupting tooth reaches the occlusal plane

36
Q

Functional stage:

Starts?

Ends?

A

Starts – at the occlusal plane

Ends – continues throughout life

37
Q

During the functional stage, the main movement is ____?

This leads to anterior teeth crowding

A

Mesially (mesial-drift)

38
Q

The attachment of the juntional epithelium chages during the ______ stage

Most likely attaching to the ________ later in life

A

Functional

Cementum

39
Q

Functional arrangement of fiber bundles of the PDL occurs during which stage?

A

Functional

40
Q

What are changes that can occur during functional eruption?

A
  1. Attrition
  2. Dead tracts
  3. Reparative Dentin (3*)
  4. Continued dentin formation (internally)
  5. Reduced pulp tissue volume
  6. Ectopic Mineralization
41
Q

True or False?

A 30 year old’s mandible will be the same size as an 85 year old’s mandible

A

FALSE

Also …

Bone is lost when teeth are lost

42
Q

Maintenance of teh Alveolar Process (remodeled bone crypt) occurs during the _______ stage

A

Functional

43
Q

TERM – occurs between the junctional epithelium and adjacent connective tissue (lamina propria)

A

Reciprical Induction

44
Q

What stage classifies a succedaneous tooth under a primary tooth that is in its functional stage?

A

Pre-emergence

45
Q

What stage classification would a 6yr old’s 1st molars be in?

A

Pre-functional (non-succedaneous)

46
Q

What stage would a 6yr old’s 2nd molar be in?

A

Pre-emerging

47
Q

TERM – the physiologic elimination of primary teeth caused by the resorptive action of odontoclasts

A

Shedding

48
Q

Odontoclasts originate in the ______ ____ and are conveyed to the activity site via _____ ______.

A

Bone Marrow

Blood Vessels

49
Q

Odontoblasts resorb what 3 tooth tissues?

A
  1. Enamel
  2. Dentin
  3. Cementum

NOT PULP

50
Q

In order for a permanent central incisor to ______, the ______ of the primary incisor must occur

A

Erupt

Shedding

51
Q

You examine a palatal view of a 5yr old’s skull, what are these tiny holes?

A

Gubernaculum Canals

52
Q

What does the gubernculum canal contain?

A

Gubernaculum Ligament

53
Q

TERM – gubernaculum ligament passes thru the gubernaculum canal and attaches to _______ of succedaneous teeth

A

Dental Follicle

54
Q

What are thought to help guide succedaneous teeth into the oral cavity?

A

Gubernaculum Ligaments

Oral Histology Exam II (BLW) (7 decks)

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