Teeth 2

Question 1

Teeth in cat

Answer 1

-typical carnivore teeth
-incisors are small
-canine more exaggerated
-less cheek teeth

Question 2

Dental formula of cat

Answer 2

-deciduous: i3-c1-p3/i3-c1-p2 =TOTAL 26
-permanent: I3-C1-P3-M1/I3-C1-P2-M1 = TOTAL 30

Question 3

What teeth are the cat missing?

Answer 3

Upper jaw: missing P1, M2, M3

Lower jaw: missing P1, P2, M2, M3

Question 4

Cat teeth roots

Answer 4

-incisors and canines have 1 root
-all cheek teeth have 2 roots except upper P2 has 1 root and upper P4 has 3 roots

Question 5

Brachydont

Answer 5

-low crowed with well developed roots
-broad tooth
-enamel covers crown, cement covers root

Question 6

Brachydont examples

Answer 6

• includes all teeth in human, dog, cat,
• all except canine in pig
  -incisors and canine of ox
  -canine in horse

Question 7

Hypsodont

Answer 7

-high-crowned with short roots
-long tooth
-adapted for abrasive diet
-crown very long and reserve crown present (so continued crown eruption)
-enamel covers crown and most of root
-cement is porous and tooth stains easily; also follows and covers enamel in root and crown

Question 8

Hypsodont examples

Answer 8

• All teeth except canine in horse
• Cheek teeth in ox
• Canine tusk in pig

Question 9

Hypselodont

Answer 9

-boar tusks and rodent incisors
-rootless so never stop growing

Question 10

Hypsodont wear pattern

Answer 10

• Enamel casing is a continuous ribbon upon eruption BUT begins wear soon after erupting
• 5” horse incisor is worn ~1/8 per year
• Cusps and dentin visible

Question 11

Complicated patterns of enamel folding

Answer 11

-increases durability
-Form a rasp-like mastication surface due to differential rate of wear

Question 12

Dental formula of horse

Answer 12

-permanent female w/o wolf: I3-C0-P3-M3/I3-C0-P3-M3 = TOTAL 36
-permanent male w/o wolf: I3-C1-P3-M3/I3-C1-P3-M3 = TOTAL 40

Question 13

Dentition of horse

Answer 13

-horse teeth adapted for grinding
-all hypsodont except canine
-have extensive reserve crown
-can have up to 11 teeth per quadrant
-canine missing in more than 70% of mares
-upper arcade wider

Question 14

Wolf tooth

Answer 14

• P1; present in ~50% of horses
• Vestigial and usually only upper jaw
• Usually extracted upon eruption because interferes with bit

Question 15

Horse cheek teeth

Answer 15

-from P2-M3
- only first and last cheek teeth are somewhat triangular, rest are rectangular
- upper cheek teeth much wider and have 2 infundibula (cups)
- enamel of lower cheek teeth more folded but has no infundibula

Question 16

Horse teeth extraction

Answer 16

-teeth are not easily extractable without trephination/surgery

Question 17

Diastema in horse

Answer 17

Gap between incisors and first premolar
- Can include canine

Question 18

Floating teeth in horse

Answer 18

Needed to file down sharp edges
- Sharp edges occur because the upper arcade is wider and occlusal plane slopes so buccal edge of upper cheek teeth and lingual edge of lower teeth remain unworn and become sharp

Question 19

Dentition in ox

Answer 19

-cheek teeth are hypsodont
- missing upper incisors and canines
-lower canine assimilated to incisors creating I4
-large diastema
-missing P1
- 6 cheek teeth increase in size
-upper cheek teeth and arcade wider

Question 20

Infundibula in ox

Answer 20

• upper and lower molars have 2 infundibula
  -upper premolars have 1 infundibulum, lower ones have none

Question 21

Dental formula of ox

Answer 21

-permanent: I0-C0-P3-M3/I3-C1-P3-M3 = TOTAL 32

Question 22

Dentition in pig

Answer 22

-omnivorous set of teeth
-full complement of teeth (11 per quadrant)
-abrasion of upper and lower canine together keeps them sharp
-tusks in boars continuously grow (hypselodont)
-cheek teeth increase in length and width to back and are adapted for crushing

Question 23

Dental formula of pig

Answer 23

-permanent: I3-C1-P4-M3/I3-C1-P4-M3 = TOTAL 44

Question 24

Dentition in llama

Answer 24

• Camelids have a dental pad, similar in ruminants
• Have a single upper incisor that is shaped like a canine
• Fighting teeth= upper and lower canines and upper incisors

Question 25

Radiographs of teeth in dog

Answer 25

• Show damage to gingiva
• 85% of dogs and cats have periodontal disease by age of 3 yrs
  »Disease causes gum recession and bone loss

Question 26

Transitory tubercles

Answer 26

Eruption bumps in horses around 2-4 yrs old under lower jaw

Mandible molds around growing permanent tooth root, prevented from rising due to a retained cap that resists shedding
-cap= deciduous p4 wedged between permanent P3 and M1 which impeded eruption of P4 and P3
- once the cap is removed, P4 moves in and swellings gradually disappear