Which one of the following correctly represents the normal adult human dental formula?

3/3, 1/1, 3/2, 1/1

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2/2, 1/1, 3/2, 3/3

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2/2, 1/1, 2/2, 3/3

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3/3, 1/1, 3/3, 3/3

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Solution

The correct option is C 2/2, 1/1, 2/2, 3/3
The set of teeth which is deciduous is called milk teeth. This type of teeth is seen in children. Whereas the teeth that grow after the shedding of the milk teeth are called the permanent teeth. The human adult has a set of permanent teeth. There are four kinds of teeth - incisors, canines, premolars and molars. Incisors are usually specialised for cutting. Canines lie immediately behind the incisors and are used for tearing and ripping the food. Premolars and molars are called cheek teeth which are broad and strong. The permanent teeth have 8 incisors, 4 canines, 8 premolars and 12 molars. Arrangement of the teeth in each half of the upper and lower jaw in the order incisors (I), canines (C) , premolars (P) and molars (M) is represented by a dental formula. In adult human the dental formula is -

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{[{(\frac{2}{3})}^{2}]}^{3} \times {(\frac{1}{3})}^{- 2} \times 3^{- 1} \times \frac{1}{6}

\frac{1}{1!} + \frac{1 + 3}{2!} + \frac{1 + 3 + 3^{2}}{3!} + \dots . . \infty =

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(i) $1 - \frac{1}{3} + \frac{1}{3^{2}} - \frac{1}{3^{3}} + \frac{1}{3^{4}} + . . . . \infty$

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(v) $\frac{1}{3} + \frac{1}{5^{2}} + \frac{1}{3^{3}} + \frac{1}{5^{4}} + \frac{1}{3^{5}} + \frac{1}{5^{6}} + . . . . . \infty$

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