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dental formula


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A method of describing the number and arrangement of teeth in man and animals using letters and figures. It is written as an expression of the number of each type of tooth in one side of the upper jaw over the number of teeth in one side of the lower jaw. The letters correspond to the type of teeth (I = Incisor, C = Canine, P = Premolar, M = Molar). Humans have two dental formulae, one for the primary dentition and one for the permanent dentition. The dental formulae for different animals varies according to diet and function.

Dental formulae of humans and some animals

Species

Dental formula

Total number of teeth

Human (primary dentition)

I 2/2 C1/1 M2/2

20

Human (secondary dentition)

I 2/2 C 1/1 P 2/2 M 3/3

32

Dog

I 3/3 C 1/1 P 4/4 M 2/3

42

Horse

I 3/3 C 1/1 P 4/4 M 3/3

44

Sheep

I 0/3 C 0/1 P 3/3 M 3/3

32

Rat

I 1/1 C 0/0 P 0/0 M 3/3

16

Subjects: Dentistry.


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