The modified triadan system is a scheme of
dental nomenclature that can be used widely across different animal
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
. It is used worldwide among
veterinary surgeon
Veterinary surgery is surgery performed on non-human animals by veterinarians, whereby the procedures fall into three broad categories: orthopaedics (bones, joints, muscles), soft tissue surgery (skin, body cavities, cardiovascular system, GI/u ...
s.
Each
tooth
A tooth (: teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, tea ...
is given a three digit number.
The first number relates to the quadrant of the mouth in which the tooth lies:
# upper right
# upper left
# lower left
# lower right
If it is a deciduous tooth that is being referred to, then a different number is used:
- upper right
- upper left
- lower left
- lower right
The second and third numbers refer to the location of the tooth from front to back (or
rostral
Rostral may refer to:
Anatomy
* Rostral (anatomical term), situated toward the oral or nasal region
* Rostral bone, in ceratopsian dinosaurs
* Rostral organ, of certain fish
* Rostral scale
The rostral scale, or rostral, in snakes and other sca ...
to
caudal). This starts at 01 and goes up to 11 for many species, depending on the total number of teeth.
References
*
* {{cite web , title=Modified triadan system: tooth numbering in the dog , url=https://www.rvc.ac.uk/Review/Dentistry/Basics/triadan/dog.html , publisher=eMedia Unit RVC , accessdate=2018-12-04 , date=2002
Mammal anatomy
Horse anatomy
Zoology