# Modified Triadan system

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{{Short description|Veterinary tooth numbering system}}
thumb|Modified Triadan system of dental nomenclature in the adult horse.
The '''modified Triadan system''' is a scheme of [dental](/source/tooth) nomenclature that can be used widely across different animal [species](/source/species). It is used worldwide among [veterinary surgeon](/source/veterinary_surgeon)s.

Each [tooth](/source/tooth) is given a three digit number (eg. 203).

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:
<ol type="1" start="5">
<li>upper right</li>
<li>upper left</li>
<li>lower left</li>
<li>lower right</li>
</ol>The second and third numbers refer to the location of the tooth from [rostral](/source/Anatomical_terms_of_location) to [caudal](/source/Caudal_(anatomical_term)). This starts at 01 and goes up to 11 for many species, depending on the total number of teeth. In each quadrant, a "full mouthed" animal has 3 incisors, 1 canine, 4 premolars, and 3 molars. When numbering teeth in species which are not full mouthed (eg. domestic cats), it is helpful to note that the canine will always be numbered 4 and the first molar will always be numbered 9.<ref>{{Cite journal |last=Floyd |first=Michael R. |date=1991-12-01 |title=The Modified Triadan System: Nomenclature for Veterinary Dentistry |url=https://doi.org/10.1177/089875649100800402 |journal=Journal of Veterinary Dentistry |language=EN |volume=8 |issue=4 |pages=18–19 |doi=10.1177/089875649100800402 |issn=0898-7564|url-access=subscription }}</ref>

==References==
{{Reflist}}

* {{cite journal |last1=Floyd |first1=M.R. |title=The modified Triadan system: nomenclature for veterinary dentistry |journal=Journal of Veterinary Dentistry |date=December 1991 |volume=8 |issue=4 |pages=18–9 |doi=10.1177/089875649100800402 |pmid=1815632|s2cid=46606483 }}
* {{cite web |title=Modified triadan system: tooth numbering in the dog |url=https://www.rvc.ac.uk/review/dentistry/basics/triadan/dog.html |url-status=dead |publisher=eMedia Unit RVC |archive-url=https://web.archive.org/web/20240428162521/https://www.rvc.ac.uk/review/dentistry/basics/triadan/dog.html |archive-date=2024-04-28 |accessdate=2018-12-04 |date=2002}}

Category:Mammal anatomy
Category:Horse anatomy
Category:Zoology

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