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Organology > Teeth Lecture > Flashcards

Teeth Lecture Flashcards

1
Q

Types of teeth (2)

A

Brachydont

  • Low crown
  • No growth after eruption through gingva (gum)
  • Humans

Hypsodont

  • High crown
  • Continued growth after eruption through gingiva
  • Horses
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2
Q

Brachydont-Crown (anatomical and clinical)

A

Anatomical: Covered by enamel

Clincal: Visible portion of tooth above gum line

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3
Q

Brachydont-Root

  • What
  • Covered by
  • Purpose
  • Where
A

Attached portion of tooth that extends from anatomical crown

Covered by cementum

Anchors tooth to mandible and maxilla via periodontal ligament

Alveolus

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4
Q

Brachydont-neck

  • What
  • Purpose
A

Jxn of anatomical crown and root where enamel ends and cementum begins

Attachment site of gingival epithelium to tooth

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5
Q

Enamel

  • What is it
  • What is it made of
  • What is it NOT made of
A

It’s the outer covering of crown

Made of 99% calcium phosphate in form of hydroxyapatite crystals
–>Crystals form enamel rods that span enamel
Made of 4% water and enamelin/amelogenin
–>Secreted by ameloblast

NO COLLAGEN PRESENT

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6
Q

Dentin

  • what does it do
  • Appearance
  • What is it made of
  • Secreted by
  • Dentinal tubules
A

Forms internal template of tooth

Yellow

70% calcium hydroxyapatite
20% organic
10% water

Secreted by odontoblasts (line surface of pulp cavity)

Dentinal tubules builds thickness of tooth in open channels

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7
Q

What are in patent channels that extend in the entire thickness of dentin?

A

Dentinal tubules

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8
Q

What do dentinal tubules contain

A

Odontoblast, tissue fluid, nerve endings

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9
Q

Toughest structure in body

-Second strongest

A

Enamel

2nd=dentin

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10
Q

Cementum

  • What does it do
  • Is it cellular or acellular
  • What is it made of
A

Anchors periodontal ligament to root of tooth and coats outer surface of root

Cellular (cementocytes) and acellular

Made of 50% organic (type I collagen) and water

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11
Q

What makes cementum? Maintains?

A

Cementoblasts make cementum

Cementocytes maintain cementum

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12
Q

Pulp cavity

  • What is it made of
  • What is it lined by
  • Ageing causes
A

LCT and extensive nerves and vessels transit through apical foramen

Lined by odontoblasts

With age, there is decrease in size (due to life time secretion of dentin)

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13
Q

What can the pulp cavity be divided into

A

Pulp chamber (cavity of the crown)

Root canal (pulp in root of tooth)

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14
Q

Give some supporting tissue

A

Gingiva (gum)
Gingival sulcus
Periodontal ligament

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15
Q

Gingiva

  • what is it
  • classify
  • How is gingiva oriented to bone?
A

Cutaneous mucous membrane moistened by salivary glands

Stratified squamous epithelium w/DICT

Anchored to bone

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16
Q

Gingiival sulcus

  • What
  • Classify
  • Attachment
A

Wedged shaped potential space btw gingiva and anatomical crown
(bacteria and debris can get stuck here)

Cutaneous mucous membrane= stratified squamous epithelium and DICT

Epithelium attached to neck of tooth at bottom of gingival sulcus
(junctional epithelium at site of attachment)

17
Q

Periodontal ligament

  • purpose
  • made of
  • reflex
A

Suspends tooth ina alveolus (shock absorber)

Made of coarse type 1 collagen and Sharpey’s fibers anchor ligament in alveolar bone and cementum

Jaw-jerk reflex= muscles relax when bite on something hard…proprioceptive nerve endings sense tooth location.

18
Q

Periodontal disease

A

Destruction of suspensory apparatus of tooth

Initiated by food/debris in gingival sulcus

Inflammation/bacteria can lead to destruction of alveolar bone and periodontal ligament

Epithelial attachment of gingiva forced onto exposed root

19
Q

Teeth cleaning

A

Every 6-12 mo to clean gingival sulcus

Expands life span avg 3 yrs

20
Q

Hypsodont teeth example species

A

All horse teeth

Tusks of pig

Cheek teeth of cattle and ruminants

21
Q

Crown, root, and neck of hypsodont tooth

A

Crown=long w/enamel
Root=short w/no enamel
Neck= hard to define

22
Q

Cementum of hyposodont tooth

A

Cememntum is deposited on entire surface of tooth (covers enamel)

23
Q

Infundibulum and cup of hypsodont tooth

A

Infundibulum: surface invagination lined by enamel, covered by cementum

Cup=cavity in center of infundibulum

24
Q

Enamel crest of hyposodont tooth

A

Projections of enamel on occlusal surface

Enamel wears away until dentin is exposed

Organology (13 decks)

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