Day 3 Herbivore Dentition

upper jaw is wider than lower jaw. True/false

true

Upper cheek teeth are wider than lower cheek teeth. True/false

true

Where does the TMJ joint sit?

above occlusal surface

What allows for lateral motion when chewing?

meniscus of TMJ joint

How do herbivores chew?

on one side with grinding motion

What is the purpose of the incisors?

cut/rip grass and foods, fighting in some species (I3 in new world camelids)

In herbivores, the deciduous teeth are brachydont or hypsodont?

brachydont

In ruminants and pigs, what tooth type are permanent incisors?

brachydont

In horses and camelids, what tooth type are permanent incisors?

hypsodont

What tooth type are canines in ruminants?

brachydont (identical to incisors)

What tooth type are canines in horses?

brachyodont

Are canines present in males and females?

full eruption in males only

What tooth type are canines in camelids?

hypsodont

What tooth type are canines in pigs?

hypsodont (sometimes forming tusks)

Do boar tusks stop growing?

no

Horses premolars and molars are hypsodont, and erupt gradually as what occurs?

worn down occlusal surface

In horses 2 infundibula are present in what teeth?

maxillary

Ruminants have infundibula in what teeth?

upper and lower cheek teeth

How can you identify brachydont deciduous teeth?

white, fine lines on labial side, definite neck

When do deciduous incisors erupt in horses?

6 days, 6 weeks, 6 months

When do permanent incisors replace deciduous in horses?

2.5 years, 3.5 years, 4.5 years

When does the canine erupt in horses?

age 5

Where do wolf teeth erupt?

most commonly maxilla, occasionally mandible

Is the development of wolf teeth sex-specific?

no

What is the nomenclature for the wolf tooth?

5 (105, 205, 305, 405)

what clues do you have to the age of a horse once all permanent teeth are present?

flat shape of occlusal surface, absence of cups, angle of incisors

At approximately what age does a dental star appear on the occlusal surface?

9

At approximately what age will the cups be gone?

7

As horses age, the occlusal surface becomes more _______________ (shape).

triangular

How many premolars do horses have?

3 (on each side)

How many molars do horses have?

3 (on each side)

Equine dental formula

I3/3, C1/1, P3-4/3, M3/3