Comparative dentition

Question 1

What is the space between the incisors and molars of a rodent known as?

A. Open rooted
B. Diastema
C. Diallema
D. Hard Palate

Answer 1

B. Diastema

Question 2

What is the dental formula of an adult rabbit?

A. I 1/1, C 0/0, PM 3/2, M 3/3
B. I 1/1, C 0/0, PM 2/3, M 3/3
C. I 2/1, C 0/0, PM 3/2, M 3/3
D. I 2/1, C 0/0, PM 2/3, M 3/3

Answer 2

C. I 2/1, C 0/0, PM 3/2, M 3/3

Question 3

What is a dental arcade?

Answer 3

A series or arches + how the teeth are arranged within the oral cavity

Question 4

How many dental archades are there in the oral caivity?

Answer 4

2

Question 5

Name the 2 bones that are associated with the 2 dental arcades?

Answer 5

• Top arcade = Maxilla
• Bottom arcade = Mandible

Question 6

What is meant by the term Diastema

Answer 6

A gap in the teeth between the incisors + cheek teeth

Question 7

What are Hypsodont teeth?

Answer 7

Teeth with:
* Deep roots
* Tall crowns
* No discernable neck
* Straight sides

Question 8

What are Brachydont teeth?

Answer 8

Teeth with:

• Short roots
• Short crowns
• Discernable neck
• Curved edges

Question 9

What are Heterodont teeth?

Answer 9

Hetero = different

Vairous different types of teeth that have specialised functions

(I, C, PM, M)

Question 10

“Di-phyo-dont” = ‘DIffyodont’

What are Diphyodont teeth?

Answer 10

Di = 2

Describes teeth that go through 2 cycles - deciduous + permanent

Think D for Deciduous

Question 11

Where are the Incisors located?
+
What is their function?

Answer 11

Located = Front of the mouth
+
Function:
* Biting
* Cutting
* Fine nibbling
* Grooming

Question 12

Where are the Canines located?
+
What is their function?

Answer 12

Located = Between the incisors + premolars
+
Function:
* Grip prey

Note =
* Not present in all species
* In carnivores

Question 13

Where are the Premolars located?
+
What is their function?

Answer 13

Located = Between the canines + molars
+
Function:
* Known as ‘Cheek’ teeth
* Grinding food

Question 14

Where are the Molars located?
+
What is their function?

Answer 14

Located = Back of the mouth + after the premolars
+
Function:
* Grinding food
* Not present in deciduous teeth

Question 15

Do birds have teeth?

Answer 15

No!

Question 16

What is the significant characteristic of open-rooted teeth?

Answer 16

• They are continuously growing throughtout the animal’s lifetime
• Naturally ground down in the wild due to animal’s diet (Cellulose in rabbit’s herbivorous diet etc)

Question 17

What shape are incisors of rodents?

Answer 17

Chisel-shaped

Question 18

What type of roots do rodent incisors have?

Answer 18

Open rooted

Question 19

True or False.

Rodents have 2 pairs of incisors, whilst rabbits have 1 pair of incisors.

Answer 19

False.

• Rodents = 1 pair of incisors
• Rabbits = 2 pairs of incisors