Digestive System Lecture 3-Arrangement Of Teeth

Front 1

Back 1

Front 2

temporary/deciduous teeth

Back 2

Incisors
Canines
Premolars

Front 3

permanent teeth only

Back 3

molars

Front 4

dental formula

Back 4

Describes the number of each type of tooth in ONE SIDE of the upper and lower dental arcade of a specific species

Front 5

write dental formula for the following

Back 5

Front 6

dog dentition

Back 6

adapted for attacking pretty, tearing food, crushing bones. Food does not remain in the mouth long before it is swallowed

Front 7

cat dentition

Back 7

- almost no crushing teeth- fewer molars and premolars

Front 8

carnivore incisors

Back 8

Sharp when first erupt
Tricuspid (three bumps on occlussal surface), loss of definition with age
Sharp for holding and tearing
Single root

Front 9

carnivore canines

Back 9

Weapons for attack and defense
Root much longer than crown

Front 10

carnivore premolars/molars

Back 10

Cutting food, crushing bones
Only occlude caudually ( cannot grind)
P1 upper and lower – one root
Upper P2 and P3 and rest of lower cheek teeth- 2 roots
Rest of upper teeth (i.e. P4, M1, M2)- 3 roots
Divide crown before extraction

Front 11

Upper P4, Lower M4 in carnivores known as

Back 11

CARNASSIAL TEETH
Rostrally sharp for cutting
Causally flat for crushing
Upper carnassials often infected due to crown damage

Front 12

horse canines

Back 12

Most mares have no or not all canines erupt
Lie in diastema ( space between incisors and check teeth)
No real function

Front 13

horse incisors

Back 13

CONTINOUS GROWTH OF ROOTS, CONTINUOUS ERUPTION COMPENSATING FOR WEAR
Cement outside enamel
Enamel not continuous over occlusal (grinding surface)- exposure of dentine

Pulp cavity- appears and age ( filled with secondary dentine)

Front 14

INFUNDIBLUM-

Back 14

mark, disappears with age

Front 15

horse cheek teeth

Back 15

Rest of M and P form continuous flat grinding surface
ERUPT CONTINUOUSLY
Convoluted enamel pattern on table
Abrasive enamel ridges due to different rates of wear and tear of enamel compared with dentine and Cementum
No continuous covering of enamel on table
Cementum around crown

Front 16

PI in horses

Back 16

wolf tooth ( only present in some animals) and not replaced

Front 17

Back 17

Front 18

Back 18

Front 19

ox/sheep incisors and canines

Back 19

No upper incisors or canines- replaced by hard fibrous DENTAL PAD
Trap food and tear by head movement
NO continuous eruption
Lower canines identical to incisors

Front 20

ox/sheep cheek teeth

Back 20

Increase in size from rostral to causal
Similar to horse- CONTINUOUS ERUPTION
Arrangement of enamel ridges slightly different from horse, enamel stands out more.

Front 21

pig incisors

Back 21

Lower one project forward for digging

Front 22

pig canines

Back 22

tusks
Erupt continuously in boars
Used for tearing ( directed laterally)

Front 23

pig cheek teeth

Back 23

For crushing and grinding, rounded cusps
NO continuous eruption

Front 24

rodent/rabbits canines

Back 24

have none

Front 25

rodent/rabbits incisors

Back 25

Enamel rostrally only- sharp chisel shaped
grow continuously
no pulp cavity- insensitive- can be clipped if malformation occurs due to improper occlusion