Horse Teeth Lecture Flashcards
Deciduous dental formula
I 3/3
C 0/0
PM 3/3
(2x)
Total=24
Permanent dental formula
I 3/3
C 1/1
PM 3 or 4/3
M 3/3
(2x)
Total= 4o or 42
Pre molar explanation in permanent dental formula
Small “wolf tooth” may be present but doesn’t stay whole time.
Canine teeth variability
Gender and breed related
Females normally lack
But islandic females have
Growth rate of horse teeth
2-3 mm/yr
Hypsodont
long tooth
Lophodont
Cheek teeth have transverse ridges on occlusal surface called lophodont
What causes the slanted occlusal surface. Problems?
Maxillary cheek teeth are wider than mandibular cheek teeth= Anisognathia
Creates sharp edges that causes clinical implications= unequal jaw.
To fix, file inside lower and outside upper
Slanted occlusal surface causes
anisognathia
T/F Lower cheek teeth has true infundibulum
F
No true
T/F upper cheek teeth each have 4 infundibua
F
2
Pulp horns
Extensions of endodontic/dental cavity and pulp system into the reserve crown.
AKA portion of crown below gum
Pulp compartment
Functional unit of pulp system. May be more than one pulp compartment in a cheek tooth
T/F Pulp compartment consists of 2 pulp horns and 2 root canal
F
1 PH
1RC
Pulp cavity contains
a, v, n of tooth
Reliable criteria to estimate age of horse
Deciduous vs permanent teeth
eruption time of deciduous teeth
Eruption time of permanent teeth
Permanent teeth coming into wear
Less reliable criteria estimating horse
Disappearance of cups
Hooks
Presence of stars
Shape of incisors
Angle of mouth
Galvayne’s groove
What criteria trumps everything in estimating horse age via teeth?
Eruption time
Eruption times of deciduous incisor teeth
Central: 6-8 days
Intermediate: 6-8 weeks
Corner: 6-8 months
Eruption times for permanent incisors
Central=2.5 yrs
Intermediate=3.5 yr
Corner=4.5 yr
Canine=3.5-5 yr
When does wearing appear in permanent teeth?
1/2 yr after eruption
Full mouth in wear at what age
5 yr
Disappearance of cups dependent on
dirt and soil
T/F Cups of corner incisor teeth are often incomplete near lingual surface
T
Mark of the mouth/Enamel spot
Disappearance of the enamel ring and it’s the enamel left at the bottom of an infundibulum
Dental stars
Dark stained secondary or irregular secondary/tertiary dentin that has filled pulp cavity.
When do dental stars appear and irregular secondary/tertiary dentine
As early as 4.5-5 yrs in central incisors, 6 yrs in intermediate incisors, 7 yrs in corner
Centralized tan/white spot (irregular 2ary/3ary dentine) appears 8,9,10 yrs.
Hooks
Upper corner incisor teeth show “hooks or notches” at 7 and 11
Angle of the mouth
Profile of upper and lower incisors is approx vertical in young mouth and become more angle as aging occurs
Shape of incisor teeth
Progress in shape from oval to round to finally triangular
Galvayne’s groove
Dark stained cement showing on upper corner incisors from 10-30 yrs
Upper 1st PM not always present
Wolf tooth
Erupts about 5-6 mo, present 80% in yearlings but only 20-40% of 3 yr/o
Eruption bumps present
On mandible btwn 2-4 yrs
T/F Dental stars are reliable
F
But
Central-8
Intermediate-9
Corner-10
