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Biology Chpater 7 > Tooth > Flashcards

Tooth Flashcards

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1
Q

What is the structure of the tooth?

A 
Enamel 
Dentine
Cement
Pulp Cavity
Periodontal Membrane
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2
Q

What is the feature of enamel?

A
  1. Outermost, hardest layer of the crown
  2. Non-living; mainly made of calcium salt
  3. Hard biting surface
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3
Q

What is the feature of dentine?

A
  1. Middle layer of the tooth

2. Bone-like structure; made of living cells

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4
Q

What is the feature of cement?

A
  1. A hard fibre layer around the root

2. Fix the tooth to the jawbone

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5
Q

What is the feature of pulp cavity

A
  1. Innermost part of the tooth
  2. Contain living cells, blood capillaries and nerve endings
  3. Supply oxygen and food; remove waste
  4. Detect temperature and pressure
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6
Q

What is the feature of periodontal membrane?

A
  1. allows the tooth to move sightly

2. absorb shock when biting hard food materials

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7
Q

What are the tooth types?

A
  1. Incisor
  2. Canine
  3. Pre-molar
  4. Molar
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8
Q

What are the location, feature and function of incisor?

A

Location: At the front of the jaw
Feature: chisel-shaped, sharp
Function: Biting, chewing

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9
Q

What are the location, feature and fuction of canine?

A

Location: Next to incisor
Feature: Long, curved, pointed
Function: Tearing food, killing prey

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10
Q

What are the location, feature and function of pre-molar?

A

Location: At the sides of the jaw
Feature: 1 or 2 blunt cups, 1-2 roots
Function: Grinding and crushing food

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11
Q

What are the location, feature and function of molar

A

Location: At the back of the jaw
Feature: Larger than pre-molar, 4 blunt cups, 2-3 roots,
Function: Grinding and crushing food

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12
Q

What is dental formula?

A

Shows the number and types of teeth on each side of the upper and lower jaws

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13
Q

What is the dental formula for primary teeth?

A

2,1,0,2 (No pre-molar)

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14
Q

What is the dental formula for permanent teeth?

A

2,1,2,3

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15
Q

What are the common examples of tooth disease?

A

Tooth decay and periodontal disease

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16
Q

What is the process of tooth decay?

A
  1. Food debris (sugar+ starch) + oral bacteria form a thin layer of plaque
  2. Bacteria change sugar to acid
  3. Enamel dissolved by acid
  4. Bacteria further infect pulp cavity
  5. The nerve endings in the pulp cavity is stimulated
  6. Toothache
17
Q

What is the process of periodontal disease?

A
  1. Build up of plaque over a long period of time
  2. Bacteria release toxins to destroy periodontal fibre
  3. Tooth can’t be held firmly in the jawbone
  4. Tooth become loose and eventually fall out

Biology Chpater 7 (7 decks)

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