Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Humans have two sets of teeth in their lifetime: Milk teeth (Temporary) and Permanent teeth. There are milk teeth and permanent teeth.
The tooth consists of three main parts: the Crown (visible part), the Neck (middle part), and the Root (embedded in the jawbone).
Enamel is the white, outermost layer of the tooth and is the hardest substance in the human body, rich in minerals like Calcium ().
Under the enamel lies the Dentin, and inside the dentin is the Pulp, which contains nerves and blood vessels.
There are four types of teeth: Incisors ( for cutting), Canines ( for tearing), Premolars ( for crushing), and Molars ( for grinding).
A Dental Formula is a representation of the number and types of teeth in one half of the upper and lower jaws.
Tooth decay is caused by bacteria reacting with sugar to produce acid, which dissolves the enamel: .
📐Formulae
💡Examples
Problem 1:
Calculate the total number of Molars in an adult human mouth if the dental formula for one half of the jaw is .
Solution:
There are molars in the upper jaw and molars in the lower jaw, totaling molars.
Explanation:
In the dental formula , the last digit '' represents the number of molars in one quadrant. Since there are quadrants in the mouth, total molars = .
Problem 2:
If a child has milk teeth, how many premolars do they have compared to an adult?
Solution:
A child has premolars, whereas an adult has premolars.
Explanation:
In the milk teeth dental formula , the third digit is , meaning premolars are absent in the temporary set. They only appear in the permanent set.
Problem 3:
A tooth has a total of incisors and canines. If the total number of teeth is , how many 'grinding teeth' (Premolars + Molars) are present?
Solution:
grinding teeth.
Explanation:
By subtracting the cutting teeth (incisors) and tearing teeth (canines) from the total , we find there are premolars and molars, which equals teeth used for grinding and crushing.