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Modified Triadan System:
Tooth Numbering in the Dog



The modified Triadan system provides a consistent method of numbering teeth across different animal species. The system is based on the permanent dentition of the pig, which has 11 teeth in each quadrant - three incisors, one canine, four premolars and three molars. The grand total is 44 teeth.


The first digit of the modified Triadan system denotes the quadrant.

Triadan quadrants.
Based on an image supplied by David Crossley

Tooth Position

The second and third digits denote the tooth position within the quadrant, with the sequence always starting at the midline.

The following diagram shows tooth numbering in the dog.

The Triadan system in the dog.
Based on an image supplied by David Crossley



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