Lecture 3

Question 1

Describe hederodonty

Answer 1

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

Question 2

Describe which types of teeth are embedded in which bone

Answer 2

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

Question 3

Which teeth have a deciduous pre-cursor?

Answer 3

Incisors, canines and pre-molars

Question 4

What is the dental formula of the dog?

Answer 4

3 1 4 2

3 1 4 3

Question 5

Describe the carnassial teeth in the dog

Answer 5

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

Question 6

Describe the functions of the different teeth in the dog

Answer 6

Incisors= holding and tearing, sharp and tricuspid

Canines= attack and defence

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

Question 7

What is the dental formula of the cat?

Answer 7

3 1 3 1

3 1 2 1

Question 8

Compare the dentition of a cat and dog

Answer 8

Cat= no blunt crushing surfaces

Question 9

What is the dental formula of an omnivore ie pig

Answer 9

3 1 4 3

3 1 4 3

Question 10

T/F:

The pig has only hypsodont teeth

Answer 10

False

All teeth are brachydont except for the canines

Question 11

Which teeth are the needle teeth in pigs?

Answer 11

upper and lower I3

Upper and lower canines

Question 12

T/F:

The upper incisors in pigs project forward for digging

Answer 12

False

Lower

Question 13

Which teeth consitute the tusks of pigs?

Answer 13

Canines

These are hypsodont

Question 14

What is the dental formula of the horse?

Answer 14

3 1(0) 3(4) 3
3 1(0) 3(4) 3

Question 15

At what age do horse teeth stop ‘growing’

Answer 15

age 17

Question 16

T/F:

The cup appears with age and the star dissapears

Answer 16

False

Cup disappears with age and the star appears with age

Question 17

T/F:

Horse canine teeth are only seen in males and are hypsodont

Answer 17

False

Brachydont

Question 18

Describe the wolf tooth

Answer 18

First pre molar
usually in the upper arcade
No deciduous precursor

Question 19

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

Answer 19

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

Question 20

What is the dental formula of the ox?

Answer 20

0 0 3 3

3 1 3 3

Question 21

Which teeth does the fibrous dental pad replace?

Answer 21

Upper incisors and canines

Question 22

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

Answer 22

Brachydont= incisors/canines
Hypsodont= pre molars and molars

Question 23

What is the dental formula of the sheep?

Answer 23

0 0 3 3

3 1 3 3

Question 24

What is the dental formula of the alpaca/llama?

Answer 24

1 1 1(2) 3

3 1 1 (2) 3

Question 25

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

Answer 25

upper I3 and upper/lower canines

Question 26

Which teeth are hypsodont in the alpaca/llama?

Answer 26

Lower incisors

Question 27

What is the dental formula of the rabbit?

Answer 27

2 0 3 3 | 1 0 2 3

Question 28

Which teeth in the rabbit are aradicular hypsodont?

Answer 28

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

Question 29

T/F: Rabbit teeth are monohyodont

Answer 29

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

Question 30

Where would you find enamel on rabbit incisors?

Answer 30

Only rostrally | Makes them quite sharp, chisel shaped

Question 31

What is the function of rabbit incisors?

Answer 31

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

Question 32

What are the peg teeth in rabbits?

Answer 32

2 upper incisors behind the other 2 upper incisors

Question 33

Describe the teeth of rodents

Answer 33

``` 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 ```

Question 34

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

Answer 34

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

Question 35

T/F: | Dogs and cats have deciduous teeth erupted at birth

Answer 35

False | No teeth erupted at birth

Question 36

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

Answer 36

Look at the dental star

Question 37

What does the dental star consist of?

Answer 37

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

Question 38

Distinguish between the cup and mark

Answer 38

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

Question 39

Describe how the shape of a horse incisor occulsal surface changes

Answer 39

Cross section: oval, trapezoid, triangular, oval

Question 40

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

Answer 40

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

Question 41

Describe the angle of the horses incisor as it ages

Answer 41

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

Question 42

What is galvayne's groove?

Answer 42

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

Question 43

T/F: | Some ox incisors may already be erupted by birth

Answer 43

True

Question 44

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

Answer 44

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

Question 45

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

Answer 45

Broken mouth | Gummy mouth