Dentition in the Lagomorph, Rodent, and Ferret Flashcards
All lagomorphs and most rodents are what?
Herbivores
Lagomorphs and rodents have what type of dentition?
Heterodont
What is heterodont dentition?
Variation in tooth size and shape
Which species do not have canine teeth?
Lagomorphs and rodents
What do Lagomorphs and rodents have instead of canines?
Long diastema between the incisors and cheek teeth
What is a diastema?
Toothless area
Are ferrets missing any teeth?
No.
They have incisors, canines, premolars and molars
Are Ferrets herbivores, omnivores or carnivores?
Carnivores
How do lagomorphs differ from rodents?
They have two pairs of maxillary incisor teeth
The rostral row of incisors consists of what?
Two larger functional teeth that are large and chisel-like
What do the second row of incisors consist of?
Two smaller incisors
Referred to as “peg” teeth
Sits immediately behind the 1st row
What lagomorph teeth are aradicular hypsodont type?
Incisors and cheek teeth
What is aradicular hypsodont type teeth?
Continuously growing and erupting throughout life
Aradicular hypsodont type teeth are also referred to as what?
Elodont
The aradicular hypsodont type teeth have what?
Visible clinical crowns
Reserve crowns submerged below the gingival margin
Because the incisors and cheek teeth of lagomorphs are aradicular hypsodont and continue to grow and erupt do they form roots?
No
Do Lagomorphs have deciduous teeth?
Yes
They erupt in utero and shed around time of birth
What are the two basic types of teeth found in the rodent?
Aradicular hypsodont
Aradicular hypsodont incisors and brachyodont cheek teeth
What is a brachyodont tooth?
Has a true distinction between the crown and the root structure
Do brachuodont teeth continue to grow once fully erupted?
No
What species have aradicular hypsodont teeth for both the incsiors and cheek teeth?
Chinchillas
Guinea pigs
What species have aradicular hypsodont incisors and brachyodont cheek teeth
Mice
Rats
What species have maxillary 4th premolars and mandibular first molars teeth that are sectorial (closing in a “scissor-like” fashion)
Ferrets
What is a common finding of the family Mustelidae?
Hourglass-shaped maxillary first molar teeth
Because ferrets are carnivores they have highly specialized what?
Brachyodont dentition
In what species do the maxillary and mandibular incisor teeth come to a chisel-like point?
Lagomorphs (peg teeth are the exception)
Rodents
The maxillary and mandibular incisor teeth of lagomorphs and rodents have enamel on the front and lateral sides but just what on the palatal/lingual surface that makes them wear faster resulting in the chisel edge?
Cementum and dentin
The enamel of incisors in most rodents takes on a yellow-orange color except for what rodent?
Guinea pig
Where does the mandibular incisor apex lie in rats and mice?
Distal to the roots of the last cheek tooth
Where does the apex of the mandibular incisor of rabbits and chinchillas lie?
Near the mesial surface of the first cheek teeth
Due to their unique function, hypsodont cheek teeth have this rather than a flat occlusal table surface?
Angled occlusal table surface
Where is the highest point of the chisel tip of the maxillary cheek teeth?
On the labial side
Where is the chisel point of the mandibular cheek teeth?
On the lingual side
Where does the occlusal table surface of the mandibular cheek teeth angle?
Toward the soft tissue of the cheek teeth
What is the naturally unequal, jaw relationship, in which the upper dental arch is slightly wider than the lower dental arch?
Anisognathic
What is the angle of the occlusal plane of the cheek teeth in healthy rabbits?
~10-degree angle (dorsolingual to ventrobuccal)
What is the angle of the occlusal plane of the cheek teeth in healthy guinea pigs?
~30-degree angle
Dorsobuccal to ventrolingual
What is the angle of the occlusal plane of the cheek teeth in healthy chinchillas?
Level occlusal plane
What adaptation of hypsodont teeth is thought to explain how the periodontal ligament allows for a continued eruption?
The intermediate plexus between the tooth and the bony attachments allowing continuously growing teeth to move coronally as they grow
What is the dental formula for an adult rabbit?
2 x (2/1 I, 0/0 C, 3/2 P, 2-3/3 M
How many total teeth do adult rabbits have>
26 to 28
What is the dental formula for adult hares?
2 x (2/1 I, 0/0 C, 3/2 P, 3/3 M)
What is the total amount of teeth an adult hare has?
28
What is the dental formula for adult guinea pigs, chinchillas, and degus?
2 x (1/1 I, 0/0 C, 1/1 P, 3/3 M)
How many teeth do adult guinea pigs, chinchillas and degus have?
20
What is the dental formula for an adult rat and an adult hamster?
2 x (1/1 I, 0/0 C, 0/0 P, 2-3/2-3 M)
How many teeth do an adult rat and an adult hamster have?
12 to 16 total teeth
What is the dental formula for an adult gerbil?
2 x (1/1 I, 0/0 C, 0/0 P, 3/3 M)
How many teeth do adult gerbils have?
16
What is the dental formula for an adult squirrel?
2 x (1/1 I, 0/0 C, 1-2/1 P, 3/3 M)
How many teeth do adult squirrels have?
20 to 22
What is the dental formula for an adult ferret?
2 x (3/3 I, 1/1 C, 3/3 P, 1/2 M)
How many teeth does an adult ferret have?
34
