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Digestive System > Lecture 3 > Flashcards

Lecture 3 Flashcards

1
Q

Describe hederodonty

A

When teeth differ in their shape and function in different parts of the mouth

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2
Q

Describe which types of teeth are embedded in which bone

A 
Upper Incisors= inscive bone 
Lower incisors= mandible
Upper canines= maxilla
Lower canines= mandible
Upper premolars and molars= maxilla
Lower premolars and molars= mandible
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3
Q

Which teeth have a deciduous pre-cursor?

A

Incisors, canines and pre-molars

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4
Q

What is the dental formula of the dog?

A

3 1 4 2

3 1 4 3

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5
Q

Describe the carnassial teeth in the dog

A

upper P4 and lower M1
Rostrally sharp for cutting
Caudally flat for crushing

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6
Q

Describe the functions of the different teeth in the dog

A

Incisors= holding and tearing, sharp and tricuspid

Canines= attack and defence

Molars/premolars= cutting food and crushing bones, only occlude caudally (can’t grind)

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7
Q

What is the dental formula of the cat?

A

3 1 3 1

3 1 2 1

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8
Q

Compare the dentition of a cat and dog

A

Cat= no blunt crushing surfaces

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9
Q

What is the dental formula of an omnivore ie pig

A

3 1 4 3

3 1 4 3

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10
Q

T/F:

The pig has only hypsodont teeth

A

False

All teeth are brachydont except for the canines

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11
Q

Which teeth are the needle teeth in pigs?

A

upper and lower I3

Upper and lower canines

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12
Q

T/F:

The upper incisors in pigs project forward for digging

A

False

Lower

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13
Q

Which teeth consitute the tusks of pigs?

A

Canines

These are hypsodont

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14
Q

What is the dental formula of the horse?

A 
3 1(0) 3(4) 3
3 1(0) 3(4) 3
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15
Q

At what age do horse teeth stop ‘growing’

A

age 17

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16
Q

T/F:

The cup appears with age and the star dissapears

A

False

Cup disappears with age and the star appears with age

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17
Q

T/F:

Horse canine teeth are only seen in males and are hypsodont

A

False

Brachydont

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18
Q

Describe the wolf tooth

A

First pre molar
usually in the upper arcade
No deciduous precursor

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19
Q

Where would you find sharp points on the molars of horse teeth?

A

Buccal aspect of maxillary teeth and lingual aspect of mandibular teeth
Maxilla teeth are wider apart than the mandibular teeth

20
Q

What is the dental formula of the ox?

A

0 0 3 3

3 1 3 3

21
Q

Which teeth does the fibrous dental pad replace?

A

Upper incisors and canines

22
Q

Which teeth are brachydont and which are hypsodont in the ox?

A 
Brachydont= incisors/canines
Hypsodont= pre molars and molars
23
Q

What is the dental formula of the sheep?

A

0 0 3 3

3 1 3 3

24
Q

What is the dental formula of the alpaca/llama?

A

1 1 1(2) 3

3 1 1 (2) 3

25
Q

Which teeth are the fighting teeth in the alpaca/llama?

A

upper I3 and upper/lower canines

26
Q

Which teeth are hypsodont in the alpaca/llama?

A

Lower incisors

27
Q

What is the dental formula of the rabbit?

A

2 0 3 3

1 0 2 3

28
Q

Which teeth in the rabbit are aradicular hypsodont?

A

Incisors and cheek teeth
Grow and erupt continuously for life
Do not form roots
Adapted for highly abrasive diet and prolonged chewing

29
Q

T/F: Rabbit teeth are monohyodont

A

False Diphyodont, temporary teeth are replaced by day 35 post birth

30
Q

Where would you find enamel on rabbit incisors?

A

Only rostrally

Makes them quite sharp, chisel shaped

31
Q

What is the function of rabbit incisors?

A

Tear off vegetation, gnaw harder materials such as roots and bark

32
Q

What are the peg teeth in rabbits?

A

2 upper incisors behind the other 2 upper incisors

33
Q

Describe the teeth of rodents

A 
Monohyodont
Aradicular hypsodont
Two upper and two lower incisors
Omnivorous rodents= brachydont teeth
Most rodents except ofr guinea pigs have a yellow pigment on the surface
34
Q

List some factors that may affect accurately ageing and animal based on their teeth

A

Breed, individual genetics, age, malocclusions, trimming, dietary/environmental/behavioural factors

35
Q

T/F:

Dogs and cats have deciduous teeth erupted at birth

A

False

No teeth erupted at birth

36
Q

After tooth eruption times, what is the second most accurate way to age a horse?

A

Look at the dental star

37
Q

What does the dental star consist of?

A

Appears when the tooth is worn down to the tip of the pulp cavity
Consists of dentine that occludes the pulp cavity as the tooth is worn down

38
Q

Distinguish between the cup and mark

A

Cup= infundibulum is empty
Mark= cement filled
Variation in infundibulum depth makes this an inaccurate way to age a horse

39
Q

Describe how the shape of a horse incisor occulsal surface changes

A

Cross section: oval, trapezoid, triangular, oval

40
Q

Describe the shape of a horses upper corner incisor as it ages

A

Between 5-9= crown is wider than tall
9-10= upper corner appears square
Over 10= crown is taller than it is wide as age progresses

41
Q

Describe the angle of the horses incisor as it ages

A

The caudal angle between upper and lower incisors goes from 180 to smaller

Can result in a hook on the upper corner incisor or galvayne’s groove

42
Q

What is galvayne’s groove?

A

Longitudinal groove in the labial surface of upper corner incisor
Proven to not be reliable

43
Q

T/F:

Some ox incisors may already be erupted by birth

A

True

44
Q

Compare the morphological difference of a deciduous ox incisor compared to the permanent incisor

A

Deciduous= smaller, narrower, more triangular in shape compared to permanent

45
Q

What term is given to a sheep for the stage after the full mouth state (8 tooth) and no teeth

A

Broken mouth

Gummy mouth

Digestive System (8 decks)

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