Comparative teeth Flashcards
the presence of a set of teeth with different morphologies is called
heterodont
Difference between hypsodont and brachydont
h = long crown and short root
b = short crown and long root
2 classifications of crown and root ratio
brachydont and hypsodont
anelodont
limited period of growth
A large crown enables a lot of growth time
usually associated with hypsodont
4 occlusal pattern morphology
lophodont
bunodont
selodont
secodont
lopohodont
the cusps get connected by a ridge = loph
rasp to break down the material
horses have what occlusal pattern?
lophodont
secodont
teeth design to cut
dogs and cats
bunodont
soft and round cusps
examples of
lophodont
secodont
selodont
bunodont
l = horses
sc = dogs and cats
sl = ruminants
b = pigs
equine primary dentition formula
3 incisors
0 canines
3 pre molars
0 molars
same in maxilla and mandibula
equine permanent dentition formula
3 incisors
1 canine
3-4 pre molars
3 molars
same in maxilla and mandibula
the wolf tooth is a
pre molar
may or may not be present
how many teeths have horses?
40-42
The triadan numbering system was developed based on
pigs
pigs have
44 teeth
t/f permanent teeth erupt slightly earlier in large breeds
true
t/f eruption dates will not be affected by a growth hormone deficiency
false
The first teeth to erupt in horses are
3 incisors
Id1 erupts at
The cup disappears at
6 days
10 months
Id2 erupts at
The cup disappears at
6 weeks
12 months
Id3 erupts at
The cup disappears at
6 months
18-24 months
the permanent mandibular I1 erupts at
the cup disappears at
2.5 yrs
6 yrs
the permanent mandibular I2 erupts at
the cup disappears at
3.5 yrs
7 yrs
the permanent mandibular I3 erupts at
the cup disappears at
4.5 yrs
8 yrs
the central incisor is always #?
1
The following incisors are
2 and 3
the canines are always
4
of pre-molars
5-8
the molars are
9-11
what other factors should be taken in consideration for horse aging?
breed
feeding habits
medical history
parrot mouth
Skeletal deformity where the mandible is significantly shorter than the maxilla
Incisors are specialized for
prehension and cutting
Premolars and molars are specialized for
grinders during mastication
Teeth in horses that are not hypsodonts
canines and first pre-molar
What characteristics have the hypsodont teeth providing extra material for wear and tear?
Enamel extending past the gum line
transitory tubercles
present on mandible
retard the advance of P3 and P4
The masticatory surface of teeth in horses is increased due to
folding of the enamel during development
The folding of enamel during development results in the formation of
cement folding infundibula = cups
Cups in the incisors serve for
indicating the horses age
primary canine teeth usually
do not erupt
if they erupt, primary canine teeth are more common in
males erupting at around 5 yrs of age
adult equine mouth normally contains how many cheek teeth?
24
anisognathia
In normal horses the distance between the maxillary arcades is wider than that between the mandibular arcades
sharp enamel points
lingual edge of mandibular cheek teeth
buccal edge of the maxillary cheek teeth
due to angles of the occlusal surfsace of the cheek teeth
floating
removal of enamel points
criteria for estimating the age of a horse
eruption and wear of the deciduous incisors
eruption and wear of the permanent incisors
shape of the occlusal surfaces of the permanent incisors
profile angle between the upper and lower incisors.
diet and husbandry
wear
- contact between maxillary and mandibular incisors
Level
adjacent teeth at same height
Cup
hollow upper segment of the infundibulum
Enamel Ring/Spot
enamel of the infundibulum
Dental Star
Secondary dentin laid down over pulp cavity
characteristics of primary incisors
are whiter
have a neck
wider and shallower infundibula than their permanent successors, which erupt on their lingual aspect
characteristics of permanent incisors
curved on their labial aspect
spaces develop between them
