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Table 2 Modified Triadan numbering system

From: Computed tomographic and radiographic examination of dental structures in South American camelid specimen of different ages

Old nomenclature I1 I2 I3 C PM1 PM2 PM3 PM4 M1 M2 M3
Modified Triadan 01 02 03 04 05 06 07 08 09 10 11
  1. The modified Triadan numbering system consists of 3 numbers. The first number relates to the quadrant of the mouth in which the tooth lies; Upper Right: 1; Upper Left: 2; Lower Left: 3; Lower Right: 4.
  2. If a deciduous tooth is referred to, then a different number is used: Upper Right: 5; Upper Left: 6; Lower Left: 7; Lower Right: 8. The second and third numbers refer to the location in rostrocaudal orientation.