Teeths

Cusp pattern

Unique to species

Tooth pattern

Indicated feeding niche

Simple developemnt

Two embryonic cell types

Evolution of teeth theories:

1. Independently from pharngeal denticles seen in many
fish
2. After jaws were internalized from the skin denticles as
seen in sharks

As mandible develops, _______ cells begin to differentiate

Embryonic

Different genes _______ different tooth formations

Control`

Tooth Crown morphogenisis:

Development starts as one ___

knot

Tooth Crown morphogenisis:

As _____ get expressed more _____ form

genes, knots

Later expression= ?

shorter

Label floor of oral cavity

Floor labeling cont. label red blue arrows

Heterodont

different teeth (incisive, canine, premolar & molar)

Diphyodont:

successive development of deciduous and permanent set of teeth

Formula for teeth

Dog: permanent dentition

2(I 3/3, C 1/1, P 4/4, M 2/3) = 42

Formula dog teeth

Temp/ milk Detention: (Not as important to know)

2(I 3/3, C1/1, P3/3) = 28

teeth surface labeling

Blue=Mesial

red=Distal

what are these known as

4th superior premolar & first inferior molar and

known as Sectorial or carnassial teeth

Cats permanent teeth formula

Permanent formula

 2(I 3/3, C 1/1, P 3/2, M 1/1)=30

cats deciduous (temp.) formula:

2(I 3/3, C1/1, P3/2)=26

standard numbering system

Supernumerary teeth

Mutations or other factors can

result in extra teeth

Sometimes a health concern

but not always

how to number supernumerary teeth

Numbered slightly different:

add 50 to nearest ‘normal’

tooth

Ruminant dental formula

deciduous

Ruminant permanent formula

Brachydont

wear over time to become ‘peg mouth’

Pinchers

1st intermediate pair incisors

2nd intermediate pair incisors

corners correspond to the canine tooth that adapt an incisor shape and move closer to the incisor 3

Horse hyposodont

Flat long teeth made for
Flat long teeth made for

grinding

Erupt for life

Wear down about 2-3 mm/year

Horse Cementum

covers the surface and connects

to the bone (easily stained)

Horse Incisors:

forms the ‘cup’ or

infundibulum

Dentin

is the living softer layer that is

produced throughout life

”Dental star” is formed as tooth

becomes worn

Dental formula for horse

permanent

2(I3/3:C1/1:PM3(4)/3:M3:3) = 42

Dental formula for horse

Deciduous

2(dI 3/3: dC 0/0: dPM 3/3) = 24

Dental formula for horse

2nd premolar =

first ‘ check tooth’

first premolars in horses are called:

‘wolf tooth’

what percent of horses have wolf teeth

70%

Removed in performance horses

not harmful, but can interfere with bit and cause soreness

Horse teeth rules

First canine:

2nd premolar:

First molar:

X04 is first canine

X06 is 2nd premolar

X09 is first molar

Horse: arcade teeth

upper is ____ than ____

wider than lower

Horse arcade teeth points:

Buccal side of upper

Lingual side of lower

Aging of horse teeth

Incisors:

incisors: 6 days, 6 weeks, 6 months

2.5,3.5,4.5 years

Takes 6 months for teeth to

start to erode after erupting

(wear)

Once all enamel is wear

(Level)

Aging of horse teeth

Canines

5 years

Aging of horse teeth

Premolars

2,3,4 years

Aging of horse teeth

molars

1,2,~4 years

What are common during eruptions

Cysts

know the curves/ hook