Question

What is arrangement of teeth and different types of teeth?

Answer 1

Incisors

At the front of the mouth are eight thin, straight teeth called incisors – four at the top and four at the bottom – which bite into the food you eat and help you pronounce words as you you speak. Incisors also support the lips.

Canines

On each side of the upper and lower incisors is a single canine tooth, making four in total. Dentists call these slightly pointed teeth cuspids, and like incisors, they cut or shear food and support the lips. Another function of the canines is to help guide all the teeth into place when the upper and lower jaw come together.

Premolars

Behind the canines are the premolars, or, as dentists call them, the bicuspids. Premolars have a flattened top, and are used to chew food and maintain the height of the face. There are eight premolars in an adult's mouth: four on the top and four on the bottom.

Molars

Next to the premolars are the molars. These are your widest, flattest teeth, and there are 12 altogether: six in the upper jaw and six in the lower.

Answer 2

Hello!!

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Majority of mammals including human beings have two sets of teeth during the life i.e., one temporary set and one permanent set.

A set of temporary milk or deciduous teeth replaced by a set of permanent or adult teeth. Such type of dentition is called diphyodont.

Each tooth is embedded in a socket of jaw bone. This type of teeth attachment is called thecodont.

An adult human has 32 permanent teeth which are of four different types namely incisors (I), canines (C), premolars (PM) and molars (M). Such type of dentition is called heterodont dentition.

The arrangement of teeth half of the upper and lower jaw in the order I, C, PM and M is represented by a dental formula.

The dental formula of human being is

$\frac{2123}{2123} \times 2 = \frac{8}{8} \times 2 = \frac{16}{16} = 32$

Out of these 32 teeth, premolars and last molar teeth appear only ones I e., are monophyodont and the remaining teeth are diphyodont.

The hard chewing surface covering of the teeth is made up of enamel which helps in the mastication of food.

This enamel is the hardest substance in the human body, secreted by ameloblast cell (Ectodermal in origin) .

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