DENTIN

Introduction:

Dentin is the hard, calcified tissue that makes up the majority of a tooth. It is located beneath the enamel and cementum, and is composed of cells called odontoblasts. Dentin is responsible for protecting the pulp cavity and root canals of a tooth. When dentin is exposed to the oral environment, it can become susceptible to decay.

There are several ways to protect dentin from decay. One is to use a fluoride toothpaste and mouthwash, which helps to remineralize the enamel and dentin. Another way to protect dentin is to use a sealant on the teeth.

A sealant is a thin coat of plastic that is applied to the chewing surfaces of the back teeth. It acts as a barrier to prevent plaque and bacteria from building up on the teeth. Sealants can help to prevent cavities from forming in the dentin.

Types of Dentin:

There are three types of dentin: primary, secondary, and tertiary.

1. Primary Dentin is the first type of dentin to form in a tooth. It is made up of thin, delicate cells called predentin. Predentin is not as hard as mature dentin, and it does not contain any nerve endings.

2. Secondary Dentin is the type of dentin that forms after the primary dentin. It is made up of thick, collagenous fibers and contains numerous nerve endings. Secondary dentin is harder than primary dentin and is more resistant to decay.

3. Tertiary Dentin is the type of dentin that forms after the secondary dentin. It is made up of even thicker, collagenous fibers and contains even more nerve endings. Tertiary dentin is the hardest and most decay-resistant type of dentin.

Functions:

Dentin is responsible for a number of important functions in the tooth. 

  • It protects the pulp cavity and root canals.
  • It helps to remineralize the enamel.
  • It acts as a barrier to prevent plaque and bacteria from building up on the teeth. 
  • Additionally, tertiary dentin is responsible for giving teeth their natural color.

Conclusion:

Dentin is a hard, calcified tissue that makes up the majority of a tooth. It is located beneath the enamel and cementum, and is composed of cells called odontoblasts. Dentin is responsible for protecting the pulp cavity and root canals of a tooth. When dentin is exposed to the oral environment, it can become susceptible to decay.

However, there are several ways to protect dentin from decay, including the use of fluoride toothpaste and mouthwash, sealants, and tertiary dentin. When dentin is properly protected, it can resist decay for many years.