Lecture 19 3/25/24

Question 1

What classification is given to permanent equine teeth?

Answer 1

hypsodont

Question 2

What are the general characteristics of equine teeth?

Answer 2

-long, with bulk of tooth embedded in jaw
-slowly erupt over time as animal wears them at occlusal surface

Question 3

What are the components of an incisor tooth?

Answer 3

-cup
-dental/pulp cavity
-dental star

Question 4

What are the characteristics of the dental star?

Answer 4

-formation of secondary dentine by primary dentine
-remnant of pulp cavity

Question 5

When is a tooth considered “in wear?”

Answer 5

when in contact with the opposite arcade

Question 6

What is the deciduous tooth formula?

Answer 6

3 0 3 / 3 0 3 (no molars)

Question 7

How are the premolars numbered?

Answer 7

2, 3, 4 from rostral to caudal

Question 8

What is the permanent tooth formula?

Answer 8

3 1 3(4) 3 / 3 1 3 3

Question 9

How do newly erupted permanent teeth differ from deciduous teeth?

Answer 9

-labial surface: deciduous teeth have striations; permanent teeth have single groove
-neck: deciduous teeth have prominent neck; permanent do not
-size: deciduous teeth are about as tall as wide; permanent teeth are taller than wide

Question 10

How are the incisor teeth numbered?

Answer 10

-central: I1
-intermediate: I2
-corner: I3

Question 11

What is the infundibulum?

Answer 11

depression in tooth on occlusal surface that houses the invagination/cup

Question 12

What eventually replaces the cup as it becomes shallower with wear?

Answer 12

dental star

Question 13

What is a wolf tooth?

Answer 13

first upper premolar, if present

Question 14

What is the enamel spot?

Answer 14

bottom of the cup

Question 15

Which teeth are used for aging based on presence/absence of cups?

Answer 15

lower incisors

Question 16

When is a tooth considered “level?”

Answer 16

when all edges of the occlusal surface are “in wear” and the surface is level

Question 17

How does the shape of the occlusal surface change as the permanent incisors erupt?

Answer 17

-begins oval
-transitions to round
-ends more triangular

Question 18

Why is it better to age based on eruption compared to wear?

Answer 18

wear can be artificially excelerated, but eruption is consistent

Question 19

How should aging based on teeth be worded?

Answer 19

“this horse has the teeth of a xx age horse”

Question 20

How is angulation used in aging teeth?

Answer 20

teeth are more in line when young, and angle increases with age