Ch. 14: Lagomorph, Rodent, and Ferret Dentistry Flashcards
What species are included in the order Lagomorpha?
Domestic rabbit, hare, and cottontail
Adult rabbits have how many teeth?
Between 26 and 28 teeth
What does the term rodent mean?
To gnaw
What order is the largest order of the class mammalia?
Order Rodentia
What species are included as pets in the order rodentia?
Rat, mouse, guinea pig, hamster, gerbil, chinchilla, gopher, squirrel, and prairie dog
Most adult rodents have how many teeth?
Between 12 and 22 teeth
What order and family do ferrets belong to?
Order Carnivora and Family Mustelidae
How many teeth do adult ferrets have?
34 teeth
All lagomorphs are herbivores, but some may be _____?
Omnivores
Lagomorphs and rodents have a dental formula that features variations in tooth size and shape. What is this dentition called?
Heterodont dentition
Lagomorphs and rodents have canines, but they are included as an incisor.
True or False?
False; they do not have any canines (They have a diastema (toothless area between the incisors and cheek teeth))
Ferret dentition is similar to a cats dentition.
True or False? And in what ways?
True; they have all 4 kinds of teeth and are also carnivores
How do lagomorph incisors differ from rodent incisors?
Lagomorphs have an extra set of smaller maxillary incisor teeth behind the rostral maxillary incisors
What are the extra maxillary incisors on a lagomorph known as?
Peg teeth
Describe a lagomorph dentition. What is special about them?
The special feature of lagomorph teeth is that they continuously grow and erupt as the teeth undergo normal wear. They have crowns visible intraorally and also reverse crowns submerged below the gingival margin. These teeth never form roots
What is the term for definition that has continuously growing and erupting teeth throughout an animals life?
Aradicular hypsodont teeth aka elodont
What is the term for a tooth that has a true distinction between crown and root and does no longer grow once fully erupted?
Brachyodont teeth; found in humans, cats, and dogs
Guinea pigs and chinchillas have all aradicular hypsodont teeth for both the incisors and the cheek teeth.
True or False?
True
Mice and rats have all brachyodont teeth.
True or False?
False; the incisors are aradicular hypsodont and the cheek teeth are brachyodont teeth
What shape are the maxillary first molar teeth in ferrets?
Hourglass shaped
Ferrets have aradicular hypsodont teeth.
True or False?
False; they are carnivores and have similar teeth to a cat. Cat and ferret teeth are not continuously growing (aradicular) and are all brachyodont teeth
What layers of teeth form the layers of lagomorph and rodent teeth?
They have enamel on the front and lateral sides but only cementum and dentin on the palatal/lingual surfaces
Does cementum and dentin wear faster than enamel?
Yes; this results in a chiseled edge of the teeth in lagomorphs and rodents
The enamel of incisors in most rodents takes on a yellow-orange color. Which rodent doesn’t have a yellow-orange color to its incisors?
The guinea pig
The word apices is the plural form of what word?
Apex
In rats and mice, how far do the roots of the mandibular incisors reach?
They are distal to the roots of the last cheek tooth
In rabbits and chinchillas, how far do the roots of the mandibular incisors reach?
They are located near the mesial surfaces of the first cheek tooth
In lagomorphs and rodents, the highest point of the chisel tip of the maxillar cheek teeth is on the labial side. How are the teeth angled?
Dorsally toward the soft tissue of the hard palate
In lagomorphs and rodents, the chisel point of the mandibular cheek teeth are on what aspect of the tooth?
Lingual side
The maxillary cheek teeth are wider apart from the midline than the mandibular teeth.
True or False?
True; this is called anisognathic