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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.
Quadrant
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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